CN110809143B

CN110809143B - Trapezoidal correction method and related product

Info

Publication number: CN110809143B
Application number: CN201910945678.XA
Authority: CN
Inventors: 庾波; 胡震宇
Original assignee: Shenzhen Huole Science and Technology Development Co Ltd
Current assignee: Shenzhen Huole Science and Technology Development Co Ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2021-05-25
Anticipated expiration: 2039-09-30
Also published as: CN110809143A

Abstract

The embodiment of the application provides a trapezoidal correction method and a related product, wherein the method comprises the following steps: the projector receives N pieces of ambient light information detected by N light sensors sent by the N light sensors; the projector determines whether trapezoidal distortion exists in the projector according to the N pieces of ambient light information and the N pieces of position information corresponding to the N light sensors; if the projector has keystone distortion, the projector corrects the image output by the projector. The trapezoidal correction method and device can improve the accuracy of trapezoidal correction.

Description

Trapezoidal correction method and related product

Technical Field

The application relates to the technical field of projection, in particular to a trapezoidal correction method and a related product.

Background

In the use of projecting apparatus, if we can't let the position of projecting apparatus and projection curtain or projection wall be the right angle, then the trapezoidal deformation can appear in the picture effect of projection certainly. At this time, the keystone correction function of the projector will be performed, so that the picture can be guaranteed to be a standard rectangle, and therefore, the common projectors are all provided with the keystone correction function. However, the current keystone correction requires taking a picture of a curtain or a wall surface, performing image processing and analysis, and then performing keystone correction. Because the accuracy of the result of the image analysis is low, and the accuracy of the result of the image analysis affects the accuracy of the subsequent trapezoidal correction result, the accuracy of the current trapezoidal correction is relatively low.

Disclosure of Invention

The embodiment of the application provides a trapezoidal correction method and a related product, which can improve the trapezoidal correction accuracy.

A first aspect of an embodiment of the present application provides a keystone correction method, where the method is applied to a projector system, where the projector system includes a projector, a photo-sensing module, and a curtain, where the curtain includes an inner frame and an outer frame, the photo-sensing module includes N photo sensors, and the N photo sensors are fixedly disposed between the inner frame and the outer frame, and the method includes:

the projector receives N pieces of ambient light information which are sent by the N light sensors and detected by the N light sensors;

the projector determines whether trapezoidal distortion exists in the projector according to the N pieces of ambient light information and N pieces of position information corresponding to the N light sensors;

and if the projector has trapezoidal distortion, the projector corrects the image output by the projector.

A second aspect of the embodiments of the present application provides a trapezoidal correction device, which is applied to a projector system, the projector system includes a projector, a photo-sensing module and a curtain, the curtain includes an inner frame and an outer frame, the photo-sensing module includes N photo sensors, the N photo sensors are fixedly disposed on the inner frame and between the outer frames, the trapezoidal correction device includes:

a receiving unit, configured to receive N pieces of ambient light information, which are sent by the N light sensors and detected by the N light sensors;

a determining unit, configured to determine whether keystone distortion exists in the projector according to the N pieces of ambient light information and N pieces of position information corresponding to the N pieces of light sensors;

a correction unit configured to correct an image output by the projector in a case where the determination unit determines that keystone distortion exists in the projector.

A third aspect of embodiments of the present application provides a projector comprising a processor and a memory, the memory being configured to store a computer program, the computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the step instructions as in the first aspect of embodiments of the present application.

A fourth aspect of embodiments of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program for electronic data exchange, where the computer program makes a computer perform part or all of the steps as described in the first aspect of embodiments of the present application.

A fifth aspect of embodiments of the present application provides a computer program product, wherein the computer program product comprises a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps as described in the first aspect of embodiments of the present application. The computer program product may be a software installation package.

In the embodiment of the application, a projector receives N pieces of ambient light information detected by N optical sensors and sent by N optical sensors; the projector determines whether trapezoidal distortion exists in the projector according to the N pieces of ambient light information and the N pieces of position information corresponding to the N light sensors; if the projector has keystone distortion, the projector corrects the image output by the projector. By implementing the embodiment of the application, whether trapezoidal distortion exists in the projector is determined through N pieces of ambient light information detected by N pieces of optical sensors fixedly arranged between the inner frame and the outer frame of the curtain, and under the condition that the trapezoidal distortion exists, the image output by the projector is corrected. Compared with the method of recognizing the projected image by adopting a camera, the method has the advantages that the position of the optical sensor is fixed, the accuracy of the detected ambient light information is higher, the reliability and accuracy of whether the trapezoidal distortion exists or not are higher based on the detection result analysis of the optical sensor, and the accuracy of trapezoidal correction can be improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection system provided in an embodiment of the present application;

FIG. 2 is a schematic flowchart of a trapezoidal correction method according to an embodiment of the present application;

fig. 3a is a schematic diagram illustrating a positional relationship between a projection image and a curtain when a projector provided by an embodiment of the present application projects normally;

fig. 3b is a schematic diagram of a positional relationship between a projected image and a curtain during normal projection by another projector according to the embodiment of the present application;

fig. 3c is a schematic diagram of a positional relationship between a projected image and a curtain when keystone distortion exists in a projector according to an embodiment of the present application;

FIG. 3d is a schematic diagram illustrating a positional relationship between a projected image and a curtain when keystone distortion occurs in another projector according to an embodiment of the present disclosure;

FIG. 4 is a schematic flow chart illustrating another trapezoidal correction method provided in the embodiments of the present application;

FIG. 5a is a schematic diagram illustrating a position relationship of 4 photo sensors according to an embodiment of the present disclosure;

FIG. 5b is a schematic diagram illustrating a positional relationship between a projected image and a screen in the presence of vertical keystone distortion in a projector according to an embodiment of the present application;

FIG. 5c is a schematic diagram of a position relationship between a projected image and a curtain when vertical keystone distortion exists in another projector according to an embodiment of the present disclosure;

FIG. 5d is a schematic diagram illustrating a positional relationship between a projected image and a screen in the presence of horizontal keystone distortion in a projector according to an embodiment of the present disclosure;

fig. 5e is a schematic diagram illustrating a positional relationship between a projected image and a curtain when horizontal keystone distortion exists in another projector according to the embodiment of the present application;

FIG. 6 is a schematic flow chart illustrating another trapezoidal correction method provided in the embodiments of the present application;

fig. 7a is a schematic positional relationship diagram of 8 optical sensors provided in an embodiment of the present application;

fig. 7b is a schematic diagram of a positional relationship between a projected image and a curtain when keystone distortion exists in a projector based on 8 optical sensors according to an embodiment of the present application;

fig. 7c is a schematic diagram of a positional relationship between a projected image and a curtain when no keystone distortion exists in a projector based on 8 optical sensors according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a trapezoidal correction apparatus according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a projector according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

For a better understanding of the present application, a projection system is provided below. Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection system according to an embodiment of the present disclosure. As shown in fig. 1, the projection system 100 includes a projector 10, a light sensing module 20, and a curtain 30. The curtain 30 includes an inner frame 31 and an outer frame 32, and the light sensing module 20 may include N light sensors (21, 22,. 2N shown in fig. 1), where the N light sensors are fixedly disposed between the inner frame 31 and the outer frame 32.

The projector 10 may include a light source module, an image processing module, an optical modulation module, and an optical projection module.

A light source module for projecting light to the optical modulation module;

the image processing module is used for receiving the image signal, processing the image signal to obtain a processed image signal and outputting the processed image signal to the optical modulation module;

the optical modulation module is used for modulating the light from the light source module according to the processed image signal to obtain modulated light;

and an optical projection module for projecting the modulated light onto the curtain 30 to form a projection image.

The projector can be connected with terminal devices such as a computer, a mobile phone and a tablet personal computer, and the terminal devices can be in wired connection (for example, in wired connection through a video graphic array interface) or in wireless connection (for example, in wireless connection through a WiFi or high-definition multimedia interface) with the projector. The terminal device may transmit an image signal, a video signal, an audio signal, and the like to the projector.

A Video Graphics Array (VGA) interface is a special interface for outputting data by a computer according to VGA standards. The VGA interface is an interface for transmitting analog audio and video signals.

A High Definition Multimedia Interface (HDMI) is a fully digital video and audio transmission Interface, and can transmit uncompressed audio and video signals. HDMI is an interface for transmitting digital audio and video signals.

In this embodiment of the application, the projector 10 may be in communication connection with the light sensing module 20, and may receive N pieces of ambient light information detected by N light sensors of the light sensing module 20, and the projector 10 determines whether the projector 10 has a trapezoidal distortion according to the N pieces of ambient light information and N pieces of position information corresponding to the N light sensors; if there is keystone distortion in the projector 10, the projector 10 corrects the image output by the projector 10.

The light sensing module 20 may include N light sensors, and the N light sensors may be respectively and fixedly disposed between the inner frame 31 and the outer frame 32 of the curtain 30, where N is a positive integer greater than or equal to 4. Since the light projected by the projector 10 is visible light, the N light sensors may be visible light sensors for detecting visible light in the environment. Each of the N light sensors may establish a wireless connection (e.g., a bluetooth connection, a wireless connection, a WiFi connection, etc.) with projector 10, and the N light sensors may feed back ambient light information detected by the N light sensors to projector 10. Any one of the N light sensors may send its detected ambient light information to projector 10. The N light sensors may simultaneously transmit their detected ambient light information to the projector. For example, N light sensors may periodically send their detected ambient light information to projector 10, e.g., N light sensors may send their detected ambient light information to projector 10 every 100 milliseconds.

In the projection system of the embodiment of the application, whether trapezoidal distortion exists in the projector is determined through N pieces of ambient light information detected by N pieces of optical sensors fixedly arranged between the inner frame and the outer frame of the curtain, and under the condition that trapezoidal distortion exists, an image output by the projector is corrected. Compare with adopting the camera to discernment projection image, because the pixel of camera, the position that the camera was put can cause great influence to the quality of the projection figure that the camera was shot to influence subsequent analysis of keystone distortion, and light sensor's rigidity, the degree of accuracy of the ambient light information that detects is higher, whether there is the reliability of keystone distortion and accurate higher based on light sensor's testing result analysis, can improve the degree of accuracy of keystone correction.

Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a trapezoidal correction method according to an embodiment of the present disclosure. As shown in fig. 2, the keystone correction method is applied to the projection system shown in fig. 1, and the keystone correction method may include the following steps.

The projector receives N ambient light information detected by N light sensors sent by the N light sensors 201.

In this embodiment of the application, each of the N optical sensors may detect one piece of ambient light information, where the ambient light information includes wavelength information of ambient light and ambient light intensity corresponding to the wavelength information of the ambient light. For example, each light sensor can detect the intensity of ambient light with the wavelength of 380-780 nm. The wavelength of light emitted by the projector is generally between 380 nm and 780nm, and the spectrum of the light projected by the projector changes at different moments. The spectrum is the corresponding light intensity spectrum under different wavelengths.

The projector determines whether keystone distortion is present in the projector based on the N ambient light information and the N position information corresponding to the N light sensors 202.

In the embodiment of the application, when the projector projects normally, the area covered by the projected image projected by the projector does not exceed the outer frame of the curtain. If the projected image projected by the projector exceeds the outer frame of the curtain, the projector is considered to have keystone distortion.

There are two normal situations for projector projection, the first being where the area covered by the projected image projected by the projector is within the inner frame, in which case the N photosensors may be respectively disposed in the area fixedly disposed between the inner frame and the outer frame of the curtain, and not disposed on the inner frame and on the outer frame. Referring to fig. 3a, fig. 3a is a schematic diagram of a positional relationship between a projection image and a curtain when a projector according to an embodiment of the present application projects normally. As shown in fig. 3a, when the projector projects normally, the projected image is just located in the inner frame of the curtain, and at this time, none of the N optical sensors detects the light projected by the projector.

The second is an area covered by a projected image projected by the projector between the inner frame and the outer frame, in which case half of the N photosensors are disposed on the inner frame and the other half are disposed on the outer frame. Referring to fig. 3b, fig. 3b is a schematic diagram of a positional relationship between a projection image and a curtain when the projector provided by the embodiment of the present application projects normally. As shown in fig. 3b, the projected image is located between the inner and outer rims. At this moment, the light sensor arranged on the outer frame can not detect the light projected by the projector, and the light sensor arranged on the inner frame can detect the light projected by the projector.

In the first case, when the projector has keystone distortion, a part of the area covered by the projected image projected by the projector may exceed the inner frame, enter between the outer frame and the inner frame, and even enter outside the outer frame. Referring to fig. 3c, fig. 3c is a schematic diagram of a positional relationship between a projection image and a curtain when a keystone distortion exists in a projector according to an embodiment of the present application. As shown in fig. 3c, when the projector has keystone distortion, a portion of the area covered by the projected image projected by the projector may exceed the inner frame, and at this time, a portion of the N optical sensors may detect the light projected by the projector, for example, the

optical sensors

23 and 24 in fig. 3c may detect the light projected by the projector.

In a second case, when the projector has keystone distortion, a part of an area covered by a projection image projected by the projector exceeds the outer frame, please refer to fig. 3d, where fig. 3d is a schematic diagram of a positional relationship between the projection image and the curtain when another projector provided by the embodiment of the present application has keystone distortion. As shown in fig. 3d, when the projector has keystone distortion, a part of the area covered by the projected image projected by the projector exceeds the outer frame, and at this time, a part of the N optical sensors disposed on the outer frame may detect the light projected by the projector, for example, the

optical sensors

23 and 24 in fig. 3d may detect the light projected by the projector.

If the projector has keystone distortion, the projector corrects the image output by the projector 203.

In the embodiment of the application, the projector can determine the image correction parameters according to the detection result of each of the N optical sensors; correcting an image signal received by the projector from the terminal equipment according to the image correction parameter to obtain a processed image signal, modulating the processed image signal by an optical modulation module in the projector to obtain modulated light, and projecting the modulated light onto a curtain by an optical projection module in the projector to form a projected image without distortion. Wherein the image correction parameters include image scaling parameters. The image correction parameters may perform scaling on different regions of the image signal to make the projected image without distortion formed by projection rectangular and to ensure the projected image without distortion formed by projection.

Optionally, after step 203 is executed, step 201 may also be executed continuously. The method stops until step 204 is performed. According to the embodiment of the application, after the projector corrects the image output by the projector, whether the projector has trapezoidal distortion or not is continuously judged through N pieces of ambient light information detected by N light sensors and sent by N light sensors. Since the detection results of the N optical sensors are more reliable, whether the keystone distortion still exists can be further verified through the detection results of the N optical sensors. If not, step 204 is performed. If so, the correction is continued and new image correction parameters may be redetermined at the second correction based on the difference between the second detected N ambient light information and the first detected N ambient light information for the N light sensors.

And 204, if the projector does not have trapezoidal distortion, the projector determines that the projector projects normally.

By implementing the embodiment of the application, whether trapezoidal distortion exists in the projector is determined through N pieces of ambient light information detected by N pieces of optical sensors fixedly arranged between the inner frame and the outer frame of the curtain, and under the condition that the trapezoidal distortion exists, the image output by the projector is corrected. Compared with the method of recognizing the projected image by adopting a camera, the method has the advantages that the position of the optical sensor is fixed, the accuracy of the detected ambient light information is higher, the reliability and accuracy of whether the trapezoidal distortion exists or not are higher based on the detection result analysis of the optical sensor, and the accuracy of trapezoidal correction can be improved.

Referring to fig. 4, fig. 4 is a schematic flowchart illustrating another trapezoidal correction method according to an embodiment of the present disclosure. As shown in fig. 4, the keystone correction method is applied to the projection system shown in fig. 1, and the keystone correction method may include the following steps.

The projector receives N ambient light information sent by the N light sensors and detected by the N light sensors 401.

The N optical sensors comprise a first optical sensor, a second optical sensor, a third optical sensor and a fourth optical sensor, the first optical sensor is fixedly arranged in an upper left corner area, the second optical sensor is fixedly arranged in an upper right corner area, the third optical sensor is fixedly arranged in a lower left corner area, and the fourth optical sensor is fixedly arranged in a lower right corner area; the upper left corner region comprises a straight line between the upper left corner of the inner frame and the upper left corner of the outer frame, the upper right corner region comprises a straight line between the upper right corner of the inner frame and the upper right corner of the outer frame, the lower left corner region comprises a straight line between the lower left corner of the inner frame and the lower left corner of the outer frame, and the lower right corner region comprises a straight line between the lower right corner of the inner frame and the lower right corner of the outer frame.

Referring to fig. 5a, fig. 5a is a schematic diagram of a position relationship of 4 optical sensors according to an embodiment of the present disclosure. As shown in fig. 5a, the first optical sensor 21 is fixed to the dotted area at the upper left corner (upper left corner area), the second optical sensor 22 is fixed to the dotted area at the upper right corner (upper right corner area), the third optical sensor 23 is fixed to the dotted area at the lower left corner (lower left corner area), and the fourth optical sensor 24 is fixed to the dotted area at the lower right corner (lower right corner area). The upper left corner region, the upper right corner region, the lower left corner region and the lower right corner region in fig. 5a are all rectangles. As shown in fig. 5a, the diagonal line of the upper left corner region is a straight line between the upper left corner of the inner frame and the upper left corner of the outer frame, the diagonal line of the upper right corner region is a straight line between the upper right corner of the inner frame and the upper right corner of the outer frame, the diagonal line of the lower left corner region is a straight line between the lower left corner of the inner frame and the lower left corner of the outer frame, and the diagonal line of the lower right corner region is a straight line between the lower right corner of the inner frame and the lower right corner of the outer frame. The upper left corner region, the upper right corner region, the lower left corner region, and the lower right corner region in fig. 5a are all rectangles, which are just one possible example, and may also be circles, for example, the diameter of the upper left corner region is a straight line between the upper left corner of the inner frame and the upper left corner of the outer frame, the diameter of the upper right corner region is a straight line between the upper right corner of the inner frame and the upper right corner of the outer frame, the diameter of the lower left corner region is a straight line between the lower left corner of the inner frame and the lower left corner of the outer frame, and the diameter of the lower right corner region is a straight line between the lower right corner of the inner frame and the lower right corner of the.

The projector determines whether keystone distortion is present in the projector based on the N ambient light information and the N position information corresponding to the N light sensors 402.

If the target light intensity contained in the ambient light information detected by at least one of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor exceeds a preset intensity threshold value, the projector determines that trapezoidal distortion exists in the projector;

if the target light intensities contained in the environment light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor are all smaller than a preset intensity threshold value, the projector determines that the projector does not have trapezoidal distortion.

The target light is light currently projected by the projector, and the target light intensity is the intensity of the light currently projected by the projector.

When the target light intensity included in the ambient light information detected by the first light sensor exceeds a preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds a preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is less than a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is less than a preset intensity threshold, or when the target light intensity included in the ambient light information detected by the first light sensor is less than a preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is less than a preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor exceeds a preset intensity threshold, the projector determines that the projector has vertical keystone distortion;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds a preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds a preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is less than a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is less than a preset intensity threshold, when the target light intensity included in the ambient light information detected by the first light sensor is less than a preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is less than a preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor exceeds a preset intensity threshold, the projector determines that there is horizontal keystone distortion in the projector.

Keystone distortion may include vertical keystone distortion and horizontal keystone distortion.

Referring to fig. 5b, fig. 5b is a schematic diagram illustrating a positional relationship between a projection image and a curtain when a vertical keystone distortion exists in a projector according to an embodiment of the present application. As shown in fig. 5b, the projected image covers the first photosensor 21 and the second photosensor 22, and does not cover the third photosensor 23 and the fourth photosensor 24. The target light intensity included in the ambient light information detected by the first light sensor 21 exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the second light sensor 22 exceeds a preset intensity threshold.

Referring to fig. 5c, fig. 5c is a schematic diagram of a positional relationship between a projected image and a curtain when vertical keystone distortion exists in another projector according to an embodiment of the present application. As shown in fig. 5c, the projected image covers the third photosensor 23 and the fourth photosensor 24, but does not cover the first photosensor 21 and the second photosensor 22. The target light intensity included in the ambient light information detected by the third light sensor 23 exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor 24 exceeds a preset intensity threshold.

Referring to fig. 5d, fig. 5d is a schematic diagram of a positional relationship between a projection image and a curtain when a horizontal keystone distortion exists in a projector according to an embodiment of the present application. As shown in fig. 5d, the projected image covers the first photosensor 21 and the third photosensor 23, but does not cover the second photosensor 22 and the fourth photosensor 24. The target light intensity included in the ambient light information detected by the first light sensor 21 exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the third light sensor 23 exceeds a preset intensity threshold.

Referring to fig. 5e, fig. 5e is a schematic diagram of a positional relationship between a projected image and a curtain when horizontal keystone distortion exists in another projector according to an embodiment of the present application. As shown in fig. 5e, the projected image covers the second photosensor 22 and the fourth photosensor 24, but does not cover the first photosensor 21 and the third photosensor 23. The target light intensity included in the ambient light information detected by the second light sensor 22 exceeds a preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor 24 exceeds a preset intensity threshold.

And 403, if the projector has keystone distortion, the projector corrects the image output by the projector according to the coordinate position of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor on the curtain and the target light intensity contained in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor.

In the embodiment of the present application, the coordinate positions of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor on the curtain may be stored in a memory (e.g., a nonvolatile memory) of the projector in advance, and as shown in fig. 5a, two-dimensional coordinate axes (e.g., an X axis and a Y axis in fig. 5 a) may be established on the curtain to determine the two-dimensional coordinates of the first light sensor 21, the second light sensor 22, the third light sensor 23 and the fourth light sensor 24 on the curtain.

Specifically, the projector determines an image correction parameter according to the coordinate position of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor on the curtain and the target light intensity included in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor, and corrects the image output by the projector according to the image correction parameter.

Optionally, after step 403 is executed, step 401 may also be executed continuously.

And 404, if the projector has no trapezoidal distortion, the projector determines that the projector projects normally.

By implementing the embodiment of the application, whether the projector has trapezoidal distortion or not is determined by the 4 pieces of ambient light information detected by the 4 light sensors fixedly arranged in the upper left corner area, the upper right corner area, the lower left corner area and the lower right corner area of the curtain, and the image output by the projector is corrected under the condition that the trapezoidal distortion exists. Compared with the method of recognizing the projected image by adopting a camera, the method has the advantages that the position of the optical sensor is fixed, the accuracy of the detected ambient light information is higher, the reliability and accuracy of whether the trapezoidal distortion exists or not are higher based on the detection result analysis of the optical sensor, and the accuracy of trapezoidal correction can be improved. This application adopts 4 optical sensor can confirm whether have keystone distortion, the cost is reduced.

Referring to fig. 6, fig. 6 is a schematic flow chart of another trapezoidal correction method according to an embodiment of the present application. As shown in fig. 6, the keystone correction method is applied to the projection system shown in fig. 1, and the keystone correction method may include the following steps.

The projector receives N ambient light information detected by N light sensors sent by the N light sensors 601.

Wherein, a N photo sensor includes eight photo sensors, and eight photo sensors set up four angles of frame and four angles of outer frame including respectively. Referring to fig. 7a, fig. 7a is a schematic diagram illustrating a positional relationship between 8 optical sensors according to an embodiment of the present disclosure. As shown in fig. 7a, the 8 photosensors are photosensor 21, photosensor 22, photosensor 23, photosensor 24, photosensor 25, photosensor 26, photosensor 27, and photosensor 28, respectively. The

optical sensors

21, 22, 23, 24 are respectively disposed at four corners of the outer frame, and the

optical sensors

25, 26, 27, 28 are respectively disposed at four corners of the inner frame.

The projector determines if keystone distortion is present in the projector based on the N ambient light information and the N position information corresponding to the N light sensors 602.

If target light intensity contained in the ambient light information detected by at least one light sensor in the four light sensors arranged at the four corners of the inner frame is smaller than a preset intensity threshold value, or the target light intensity contained in the ambient light information detected by at least one light sensor in the four light sensors arranged at the four corners of the outer frame is larger than the preset intensity threshold value, the projector determines that trapezoidal distortion exists in the projector;

if the target light intensities contained in the ambient light information detected by the four light sensors arranged at the four corners of the inner frame exceed the preset intensity threshold value, the target light intensities contained in the ambient light information detected by the four light sensors arranged at the four corners of the outer frame are smaller than the preset intensity threshold value, and the projector determines that the projector does not have trapezoidal distortion.

Referring to fig. 7b, fig. 7b is a schematic diagram illustrating a positional relationship between a projection image and a curtain when a projector based on 8 optical sensors has keystone distortion according to an embodiment of the present application. As shown in fig. 7b, the intensity of the target light included in the

sensors

23, 24, 27, 28 is greater than the preset intensity threshold, and the intensity of the target light included in the

sensors

21, 22, 25, 26 is less than the preset intensity threshold, so that it is determined that the projector has keystone distortion.

Referring to fig. 7c, fig. 7c is a schematic diagram illustrating a positional relationship between a projected image and a curtain when no keystone distortion exists in a projector based on 8 optical sensors according to an embodiment of the present application. As shown in fig. 7c, the target light intensities included in the ambient light information detected by the four light sensors (sensor 25, sensor 26, sensor 27, and sensor 28) disposed at the four corners of the inner frame all exceed the preset intensity threshold, and the target light intensities included in the ambient light information detected by the four light sensors (sensor 21, sensor 22, sensor 23, and sensor 24) disposed at the four corners of the outer frame all are smaller than the preset intensity threshold, so that it is determined that the projector does not have keystone distortion.

603, if the projector has keystone distortion, the projector corrects the image output by the projector.

The specific implementation of step 603 may refer to step 403, which is not described herein again.

604, if there is no keystone distortion in the projector, the projector determines that the projector is projecting normally.

By implementing the embodiment of the application, whether trapezoidal distortion exists in the projector is determined by 8 pieces of ambient light information detected by 8 light sensors fixedly arranged in the upper left corner area, the upper right corner area, the lower left corner area and the lower right corner area of the curtain, and the image output by the projector is corrected under the condition of trapezoidal distortion. Compared with the method of recognizing the projected image by adopting a camera, the method has the advantages that the position of the optical sensor is fixed, the accuracy of the detected ambient light information is higher, the reliability and accuracy of whether the trapezoidal distortion exists or not are higher based on the detection result analysis of the optical sensor, and the accuracy of trapezoidal correction can be improved.

The above description has introduced the solution of the embodiment of the present application mainly from the perspective of the method-side implementation process. It will be appreciated that the projector, in order to implement the above-described functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the present application is capable of hardware or a combination of hardware and computer software implementing the various illustrative elements and algorithm steps described in connection with the embodiments provided herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the projector may be divided into the functional units according to the above method example, for example, each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In accordance with the above, please refer to fig. 8, fig. 8 is a schematic structural diagram of a trapezoidal correction apparatus provided in an embodiment of the present application, where the trapezoidal correction apparatus 800 is applied to the projector system shown in fig. 1, the projector system includes a projector, a photo-sensing module and a curtain, the curtain includes an inner frame and an outer frame, the photo-sensing module includes N photo sensors, the N photo sensors are fixedly disposed between the inner frame and the outer frame, the trapezoidal correction apparatus 800 may include a receiving unit 801, a determining unit 802 and a correction unit 803, where:

a receiving unit 801, configured to receive N pieces of ambient light information sent by the N light sensors and detected by the N light sensors;

a determining unit 802, configured to determine whether keystone distortion exists in the projector according to the N pieces of ambient light information and N pieces of position information corresponding to the N pieces of light sensors;

a correction unit 803 configured to correct an image output by the projector in a case where the determination unit 802 determines that keystone distortion is present in the projector.

Optionally, the N optical sensors include a first optical sensor, a second optical sensor, a third optical sensor and a fourth optical sensor, the first optical sensor is fixedly disposed in an upper left corner region, the second optical sensor is fixedly disposed in an upper right corner region, the third optical sensor is fixedly disposed in a lower left corner region, and the fourth optical sensor is fixedly disposed in a lower right corner region; the upper left corner region comprises a straight line between the upper left corner of the inner frame and the upper left corner of the outer frame, the upper right corner region comprises a straight line between the upper right corner of the inner frame and the upper right corner of the outer frame, the lower left corner region comprises a straight line between the lower left corner of the inner frame and the lower left corner of the outer frame, and the lower right corner region comprises a straight line between the lower right corner of the inner frame and the lower right corner of the outer frame.

Optionally, the determining unit 802 determines whether the projector has keystone distortion according to the N pieces of ambient light information and N pieces of position information corresponding to the N pieces of optical sensors, specifically: the determining unit 802 determines that keystone distortion exists in the projector when the intensity of a target light included in the ambient light information detected by at least one of the first light sensor, the second light sensor, the third light sensor, and the fourth light sensor exceeds a preset intensity threshold; the target light intensity is the intensity of the light projected by the projector;

when the target light intensities included in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor, and the fourth light sensor are all smaller than the preset intensity threshold, the determining unit 802 determines that keystone distortion does not exist in the projector.

Optionally, when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is smaller than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is smaller than the preset intensity threshold, or when the target light intensity included in the ambient light information detected by the first light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, When the target light intensity included in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the determining unit 802 determines that the projector has vertical keystone distortion;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is less than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the first light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, When the target light intensity included in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the determining unit 802 determines that the projector has horizontal keystone distortion.

The correction unit 803 corrects the image output by the projector, specifically: the correction unit 803 corrects the image output by the projector according to the coordinate positions of the first light sensor, the second light sensor, the third light sensor, and the fourth light sensor on the curtain and the target light intensities included in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor, and the fourth light sensor.

Optionally, the N photo sensors include eight photo sensors, and the eight photo sensors are respectively disposed at four corners of the inner frame and four corners of the outer frame.

The determining unit 802 determines whether keystone distortion exists in the projector according to the N pieces of ambient light information and the N pieces of position information corresponding to the N pieces of optical sensors, specifically:

the determining unit 802 determines that keystone distortion exists in the projector when target light intensity included in ambient light information detected by at least one of the four light sensors disposed at the four corners of the inner frame is smaller than a preset intensity threshold, or when target light intensity included in ambient light information detected by at least one of the four light sensors disposed at the four corners of the outer frame is larger than the preset intensity threshold;

the target light intensity that sets up the ambient light information that four optical sensors at four corners of inner frame detected contains all surpass predetermine the intensity threshold value, set up and be in the target light intensity that the ambient light information that four optical sensors at four corners of outer frame detected contains all is less than predetermine the condition of intensity threshold value, determining unit 802 confirms that there is not trapezoidal distortion in the projecting apparatus.

Optionally, the receiving unit 801 is further configured to receive N pieces of ambient light information detected by the N light sensors and sent by the N light sensors after the correcting unit 803 corrects the image output by the projector.

The receiving unit 801 may correspond to a communication module (e.g., a communication interface) in the projector, and the determining unit 802 and the correcting unit 803 may correspond to a processor of the projector.

In the embodiment of the application, whether trapezoidal distortion exists in the projector is determined through N pieces of ambient light information detected by N pieces of optical sensors fixedly arranged between the inner frame and the outer frame of the curtain, and under the condition that trapezoidal distortion exists, the image output by the projector is corrected. Compared with the method of recognizing the projected image by adopting a camera, the method has the advantages that the position of the optical sensor is fixed, the accuracy of the detected ambient light information is higher, the reliability and accuracy of whether the trapezoidal distortion exists or not are higher based on the detection result analysis of the optical sensor, and the accuracy of trapezoidal correction can be improved.

Referring to fig. 9, fig. 9 is a schematic structural diagram of a projector according to an embodiment of the present disclosure, and as shown in fig. 9, the projector 900 includes a processor 901 and a memory 902, and the processor 901 and the memory 902 may be connected to each other through a communication bus 903. The communication bus 903 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 904 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus. The memory 902 is used for storing a computer program comprising program instructions, and the processor 901 is configured for calling the program instructions, said program comprising instructions for performing the methods shown in fig. 2 to 6.

The processor 901 may be a general purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the above schemes.

The Memory 902 may be, but is not limited to, a Read-Only Memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, optical Disc storage (including Compact Disc, laser Disc, optical Disc, digital versatile Disc, blu-ray Disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be self-contained and coupled to the processor via a bus. The memory may also be integral to the processor.

The projector 900 may further include a light source module, an image processing module, an optical modulation module, and an optical projection module. The projector 900 may also include common components such as a display screen, a communication interface, etc., which will not be described in detail herein.

Embodiments of the present application also provide a computer storage medium, wherein the computer storage medium stores a computer program for electronic data exchange, and the computer program enables a computer to execute part or all of the steps of any one of the keystone correction methods as described in the above method embodiments.

Embodiments of the present application also provide a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program causes a computer to execute part or all of the steps of any one of the trapezoid correction methods as described in the above method embodiments.

It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required in this application.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may be implemented in the form of hardware, or may be implemented in the form of a software program module.

The integrated units, if implemented in the form of software program modules and sold or used as stand-alone products, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present application may be substantially implemented or a part of or all or part of the technical solution contributing to the prior art may be embodied in the form of a software product stored in a memory, and including several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned memory comprises: various media capable of storing program codes, such as a usb disk, a read-only memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and the like.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash memory disks, read-only memory, random access memory, magnetic or optical disks, and the like.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A keystone correction method applied to a projector system, the projector system including a projector, a photo-sensing module, and a curtain, the curtain including an inner bezel and an outer bezel, the photo-sensing module including N photo-sensors, the N photo-sensors being fixedly disposed between the inner bezel and the outer bezel, the method comprising:

if the projector has trapezoidal distortion, the projector corrects the image output by the projector;

when the projector projects normally, the area covered by the projected image projected by the projector is in the inner frame;

under the condition that the N optical sensors comprise four optical sensors, the N optical sensors comprise a first optical sensor, a second optical sensor, a third optical sensor and a fourth optical sensor, the first optical sensor is fixedly arranged in an upper left corner area, the second optical sensor is fixedly arranged in an upper right corner area, the third optical sensor is fixedly arranged in a lower left corner area, and the fourth optical sensor is fixedly arranged in a lower right corner area; the upper left corner region comprises a straight line between the upper left corner of the inner bezel and the upper left corner of the outer bezel, the upper right corner region comprises a straight line between the upper right corner of the inner bezel and the upper right corner of the outer bezel, the lower left corner region comprises a straight line between the lower left corner of the inner bezel and the lower left corner of the outer bezel, and the lower right corner region comprises a straight line between the lower right corner of the inner bezel and the lower right corner of the outer bezel;

the projector determining whether keystone distortion exists in the projector according to the N pieces of ambient light information and N pieces of position information corresponding to the N light sensors, including:

if the target light intensity contained in the ambient light information detected by at least one of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor exceeds a preset intensity threshold, the projector determines that trapezoidal distortion exists in the projector; the target light intensity is the intensity of the light projected by the projector;

if the target light intensities contained in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor are all smaller than the preset intensity threshold, the projector determines that no trapezoidal distortion exists in the projector;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is smaller than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is smaller than the preset intensity threshold, or when the target light intensity included in the ambient light information detected by the first light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, the first light sensor and the second light sensor, When the target light intensity contained in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the projector determines that the projector has vertical keystone distortion;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is less than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the first light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, And when the target light intensity included in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the projector determines that the projector has horizontal keystone distortion.

2. The method of claim 1, wherein the projector corrects the image output by the projector, comprising:

and the projector corrects the image output by the projector according to the coordinate positions of the first light sensor, the second light sensor, the third light sensor and the fourth light sensor on the curtain and the target light intensity contained in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor.

3. A keystone correction apparatus, wherein the keystone correction apparatus is applied to a projector system, the projector system includes a projector, a photo-sensing module, and a curtain, the curtain includes an inner frame and an outer frame, the photo-sensing module includes N photo sensors, the N photo sensors are fixedly disposed between the inner frame and the outer frame, the keystone correction apparatus includes:

a correction unit configured to correct an image output by the projector in a case where the determination unit determines that trapezoidal distortion exists in the projector;

the N optical sensors comprise a first optical sensor, a second optical sensor, a third optical sensor and a fourth optical sensor, the first optical sensor is fixedly arranged in an upper left corner area, the second optical sensor is fixedly arranged in an upper right corner area, the third optical sensor is fixedly arranged in a lower left corner area, and the fourth optical sensor is fixedly arranged in a lower right corner area; the upper left corner region comprises a straight line between the upper left corner of the inner bezel and the upper left corner of the outer bezel, the upper right corner region comprises a straight line between the upper right corner of the inner bezel and the upper right corner of the outer bezel, the lower left corner region comprises a straight line between the lower left corner of the inner bezel and the lower left corner of the outer bezel, and the lower right corner region comprises a straight line between the lower right corner of the inner bezel and the lower right corner of the outer bezel;

the determining unit determines whether the projector has keystone distortion according to the N pieces of ambient light information and N pieces of position information corresponding to the N pieces of optical sensors, specifically: the determination unit determines that keystone distortion exists in the projector when target light intensity included in ambient light information detected by at least one of the first light sensor, the second light sensor, the third light sensor, and the fourth light sensor exceeds a preset intensity threshold; the target light intensity is the intensity of the light projected by the projector;

the determination unit determines that keystone distortion does not exist in the projector when target light intensities included in the ambient light information detected by the first light sensor, the second light sensor, the third light sensor and the fourth light sensor are all smaller than the preset intensity threshold;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is smaller than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is smaller than the preset intensity threshold, or when the target light intensity included in the ambient light information detected by the first light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is smaller than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, the first light sensor and the second light sensor, When the target light intensity contained in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the determining unit determines that the projector has vertical keystone distortion;

when the target light intensity included in the ambient light information detected by the first light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor exceeds the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor is less than the preset intensity threshold, and the target light intensity included in the ambient light information detected by the fourth light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the first light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the third light sensor is less than the preset intensity threshold, the target light intensity included in the ambient light information detected by the second light sensor exceeds the preset intensity threshold, And when the target light intensity included in the ambient light information detected by the fourth light sensor exceeds the preset intensity threshold, the determining unit determines that the projector has horizontal keystone distortion.

4. A projector comprising a processor and a memory, the memory for storing a computer program comprising program instructions, the processor being configured to invoke the program instructions to perform the method of any of claims 1-2.

5. A computer-readable storage medium, characterized in that the computer storage medium stores a computer program comprising program instructions that, when executed by a processor, cause the processor to carry out the method according to any one of claims 1-2.