CN118042296A - Method and device for realizing photographing of high-resolution image - Google Patents
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Abstract
The invention provides a realization method for photographing a high-resolution image, which comprises the following steps: acquiring a continuous image output stream when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame; the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames; and transmitting the continuous image output stream to a buffer area so as to reduce the delay of photographing the high-resolution image. A high resolution image photographing apparatus is also provided. The invention can alternately output the small resolution picture with high signal to noise ratio and the large resolution with high definition in a certain proportion continuously, supports high-definition photographing with high resolution under the condition of not cutting off the preview stream, and reduces the power consumption.
Description
Technical Field
The invention relates to the technical field of semiconductors, in particular to a method and a device for realizing photographing of high-resolution images.
Background
With more and more users taking photos by adopting digital cameras and mobile phones, the requirements of the users on high-resolution shooting are also higher and higher. In a conventional process of capturing a high-resolution high-definition image by using an image sensor, the previewed image is usually small in resolution, and when capturing, the working mode of the image sensor needs to be reconfigured to a full-size state, the high-resolution image is captured, and then the image sensor is switched to a small-resolution preview mode, so that the image sensor cannot provide a preview data stream during the capturing process, and a phenomenon of blocking a preview image occurs. In addition, there is also a way to directly capture one or more frames of the preview data stream of the image sensor during photographing, if a high resolution image is desired, the image sensor needs to always operate in a full-size state, the power consumption of the sensor and the main chip may be very high, and a lower signal-to-noise ratio in the full-size state may not obtain the desired effect.
Disclosure of Invention
The invention aims to provide a method for realizing photographing of a high-resolution image, which comprises the following steps:
Acquiring a continuous image output stream when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
and transmitting the continuous image output stream to a buffer area so as to reduce the delay of photographing the high-resolution image.
Further, after the continuous image output stream is acquired, the method further includes:
converting high resolution images in the continuous image output stream into converted image frames of low resolution according to the resolution of the low resolution images;
Replacing high-resolution image frames in the continuous image output stream with the converted image frames to form a shooting preview stream;
Transmitting the shooting preview stream to a first buffer memory, and transmitting the high-resolution image frame to a second buffer memory;
when a photo is taken, the high-resolution image frames in a preset scheme are selected from the second buffer memory to be processed and then output.
Further, in the continuous image output stream, one frame of the high-resolution image frame is set in two frames of the low-resolution image frames.
Further, the exposure time of the low resolution image frames and the high resolution image frames in the continuous image output stream is the same.
Further, a frame length of the low resolution image frames and a frame length of the high resolution image frames in the continuous image output stream are the same.
Further, in the process of acquiring the continuous image output stream, the line reading time of the image sensor when outputting the low resolution image frame is twice the line reading time when outputting the high resolution image frame.
Further, in the process of acquiring the continuous image output stream, when the next frame is the high-resolution image frame, the image sensor performs exposure control in advance according to a preset scheme so as to meet the exposure time requirement of the high-resolution image frame.
Further, in the process of acquiring the continuous image output stream, the line reading time of the image sensor when outputting the low resolution image frame is the same as the line reading time when outputting the high resolution image frame, so as to reduce flicker.
Further, the high resolution image frame is output through an image sensor full size mode, and the low resolution image frame is output through an image sensor analog merge mode.
Further, the high resolution image frame employs a 50M pixel image and the low resolution image frame employs a 25M pixel image.
Further, the converting the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image includes:
and converting the high-resolution image in the continuous image output stream into a low-resolution converted image frame according to the resolution of the low-resolution image through an internal logic circuit and/or an external processing chip and/or a main control chip of the image sensor.
Further, the selecting the high resolution image frame in the preset scheme in the second buffer includes:
Selecting the high-resolution image frame closest to the shooting time; and/or the number of the groups of groups,
Selecting the nearest high-resolution image frame before the shooting time; and/or the number of the groups of groups,
And selecting the nearest high-resolution image frame after the shooting time.
Further, the selecting the high resolution image frame in the preset scheme in the second buffer for processing includes:
and carrying out image fusion on the high-resolution image frames and a plurality of adjacent frames of the low-resolution image frames in the preset scheme to form an output image.
Further, the converting the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image further includes:
and carrying out parameter compensation on the converted image frames.
The invention also provides a high-resolution image photographing device, which specifically comprises:
The output stream acquisition module is used for acquiring a continuous image output stream output by the image output module when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
And the transmission module is used for transmitting the continuous image output stream to the buffer memory module so as to reduce the delay of photographing the high-resolution image.
Further, the method further comprises the following steps:
A resolution conversion module for converting the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image;
an image frame replacing module, configured to replace a high resolution image frame in the continuous image output stream with the converted image frame to form a shooting preview stream;
the transmission module transmits the shooting preview stream to the first buffer unit and transmits the high-resolution image frame to the second buffer unit;
and the image processing module is used for selecting the high-resolution image frames in a preset scheme from the second buffer unit for processing and outputting the processed high-resolution image frames when the picture is shot.
Further, when the image output module outputs an image, one frame of the high-resolution image frame is set in two frames of the low-resolution image frames.
Further, when the image output module outputs an image, the exposure time of the low resolution image frame and the high resolution image frame is the same.
Further, in the image output by the image output module, the frame length of the low resolution image frame is the same as the frame length of the high resolution image frame.
Further, when the image output module outputs an image, a line reading time when the low resolution image frame is output is twice a line reading time when the high resolution image frame is output.
Further, the device further comprises an exposure control module, when the image output module outputs an image, and when the next frame is the high-resolution image frame, the exposure control module performs exposure control in advance according to a preset scheme so as to meet the exposure time requirement of the high-resolution image frame.
Further, when the image output module outputs an image, a line reading time when the low resolution image frame is output is the same as a line reading time when the high resolution image frame is output, so that flicker is reduced.
Further, when the image output module outputs an image, the high-resolution image frame is output through an image sensor full-size mode, and the low-resolution image frame is output through an image sensor analog combination mode.
Further, the high resolution image frame employs a 50M pixel image and the low resolution image frame employs a 25M pixel image.
Further, the resolution conversion module converts the high-resolution image in the continuous image output stream into a low-resolution converted image frame according to the resolution of the low-resolution image through an internal logic circuit and/or an external processing chip and/or a main control chip.
Further, the image processing module includes an image selecting unit, configured to select, in the second buffer unit, the high resolution image frame in a preset scheme, where the preset scheme includes:
Selecting the high-resolution image frame closest to the shooting time; and/or the number of the groups of groups,
Selecting the nearest high-resolution image frame before the shooting time; and/or the number of the groups of groups,
And selecting the nearest high-resolution image frame after the shooting time.
Further, the image processing module comprises an image fusion unit, which is used for carrying out image fusion on the high-resolution image frame and a plurality of adjacent frames of the low-resolution image frames in the preset scheme to form an output image.
Further, the resolution conversion module includes a parameter compensation unit for performing parameter compensation on the converted image frame.
According to the scheme, the novel high-resolution image photographing realization method and device are provided, and high-resolution high-definition photographing can be supported under the condition that a preview stream is not cut off by alternately outputting a small-resolution image with high signal to noise ratio and a large-resolution image with high definition in a certain proportion.
Drawings
Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments which follows, which is read in connection with the accompanying drawings.
FIG. 1 is a flow chart of a method for photographing a high resolution image according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating a method for capturing a high resolution image according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for implementing photographing of a high resolution image according to still another embodiment of the present invention;
fig. 4 to fig. 9 are schematic structural diagrams of a device for implementing high-resolution image photographing in different embodiments of the invention.
In the drawings, the same or similar reference numerals denote the same or similar devices (modules) or steps throughout the different drawings.
Detailed Description
The invention aims to provide a method for realizing photographing of a high-resolution image, and specifically, as shown in fig. 1, the method comprises the following steps:
Step S100: acquiring a continuous image output stream when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
Step S200: and transmitting the continuous image output stream to a buffer area so as to reduce the delay of photographing the high-resolution image.
Through the steps, the image sensor is enabled to work in modes with different resolutions, the image output streams of the high-resolution image and the low-resolution image which are alternately obtained are stored in the cache, and then the image output with different resolutions is called according to requirements.
Preferably, in the continuous image output stream, one frame of the high-resolution image frame can be set in two frames of the low-resolution image frames, so that the processing requirement of more actual photographed pictures can be met.
Preferably, the exposure time of the low resolution image frames and the high resolution image frames in the continuous image output stream is the same.
In an alternative embodiment, the frame length of the low resolution image frame and the frame length of the high resolution image frame in the continuous image output stream may be the same. On this basis, it is preferable that in step S100, the line reading time of the image sensor when outputting the low resolution image frame should be twice the line reading time when outputting the high resolution image frame.
Further, in order to obtain a better shooting effect, in the process of obtaining the continuous image output stream in step S100, when the next frame is the high-resolution image frame, the image sensor performs exposure control in advance according to a preset scheme so as to meet the exposure time requirement of the high-resolution image frame.
In yet another alternative embodiment, in step S100, the line reading time of the image sensor when outputting the low resolution image frame may be the same as the line reading time when outputting the high resolution image frame, so as to reduce the flicker phenomenon occurring in the image preview.
Preferably, the high resolution image frame is output through an image sensor full size mode, and the low resolution image frame is output through an image sensor analog merge mode. Preferably, the high resolution image frame may employ a 50M pixel image and the low resolution image frame may employ a 25M pixel image.
In an alternative embodiment, the low resolution image frames may be simulated and combined into 1 large pixel in adjacent 4 pixel units for light sensing and output, as opposed to the high resolution image frames, which may take a 50M pixel image, for example, and the low resolution image frames may take a 12.5M pixel image.
Further, in an alternative embodiment, as shown in fig. 2, after step S100, the method further includes:
Step S110: converting high resolution images in the continuous image output stream into converted image frames of low resolution according to the resolution of the low resolution images;
Preferably, in step S110, after converting to a converted image frame of low resolution, the converted image frame may be subjected to parameter compensation.
Step S120: replacing high-resolution image frames in the continuous image output stream with the converted image frames to form a shooting preview stream;
Preferably, in step S120, the high resolution image in the continuous image output stream may be converted into a converted image frame with a low resolution according to the resolution of the low resolution image by an internal logic circuit and/or an external processing chip and/or a main control chip of the image sensor. In particular, interpolation or the like may be employed in various ways, which the present invention is not limited to.
Step S200 further includes:
Step S210: transmitting the shooting preview stream to a first buffer memory, and transmitting the high-resolution image frame to a second buffer memory;
Thereafter, the method further comprises:
Step S300: when a photo is taken, the high-resolution image frames in a preset scheme are selected from the second buffer memory to be processed and then output.
In an alternative embodiment, the high resolution image frame closest to the shooting time may be selected in step S300; and/or selecting the nearest high resolution image frame before the shooting time; and/or selecting the nearest high resolution image frame after the shooting time. So that the final output high resolution image is closer to the image of the user at the moment of shooting.
On this basis, preferably, in step S300, the high resolution image frames and the low resolution image frames adjacent to the high resolution image frames in the preset scheme may be subjected to image fusion to form a final output image.
For example, in one particular embodiment, as shown in FIG. 3, the image sensor may take a high resolution photographic image by:
Step S1: the image sensor alternately operates in a mode of small resolution and large resolution, taking an image sensor of 50M pixels (8192×6144) as an example, after a plurality of frames are operated in an analog combination mode and a low resolution image frame a of 12.5M pixels (4096×3072) is output, a frame can be inserted to operate in a full-size mode and a high resolution image B of 50M pixels (8192×6144) is output, preferably, 2 frames of low resolution image frame a and 1 frame of high resolution image frame B can be output;
step S2: converting the high resolution image frame B (50M pixels) into a corresponding low resolution image frame B' (12.5M) using an image sensor on-chip logic circuit or an external image processing chip while preserving the original 50M pixel picture B;
Step S3: after receiving the transmitted high-resolution and low-resolution picture streams, a central control platform of the system uses the low-resolution image frames A, B' for previewing or video data streams, and simultaneously stores the low-resolution image frames in a first temporary buffer memory, and stores the high-resolution image frames B in a second temporary buffer memory;
step S4: when photographing, selecting high-resolution and low-resolution images in the first temporary buffer and the second temporary buffer, and acquiring Gao Qinggao signal-to-noise ratio image C by adopting a multi-frame fusion mode with different resolutions.
In summary, the implementation method of high-resolution photographing provided by the invention can support high-resolution high-definition photographing under the condition of not cutting off the preview stream by alternately outputting the small-resolution picture with high signal to noise ratio and the high-definition large-resolution picture with high signal to noise ratio in a certain proportion.
In addition, the present invention also provides a high resolution image photographing apparatus, specifically, as shown in fig. 4, including:
An output stream obtaining module 10, configured to obtain, when taking a photograph and previewing, a continuous image output stream output by the image output module 20, where the continuous image output stream includes a low resolution image frame and a high resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
The transmission module 30 is configured to transmit the continuous image output stream to the buffer module 40, so as to reduce the delay of taking a high-resolution image.
In an alternative embodiment, as shown in fig. 5, the high resolution image photographing apparatus further includes:
a resolution conversion module 50 for converting the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image;
An image frame replacing module 60, configured to replace high resolution image frames in the continuous image output stream with the converted image frames to form a shooting preview stream;
The buffer module 40 includes a first buffer unit 41 and a second buffer unit 42, and the transmission module 30 transmits the photographing preview stream to the first buffer unit 41 and the high resolution image frame to the second buffer unit 42;
the image processing module 70 is configured to select the high resolution image frame in the preset scheme from the second buffer unit 42 for processing and outputting the processed high resolution image frame when taking a photograph.
In an alternative embodiment, preferably, when the image output module 20 outputs an image, one frame of the high resolution image frame may be set in two frames of the low resolution image frame.
In another alternative embodiment, the exposure time of the low resolution image frame and the high resolution image frame may be the same when the image output module 20 outputs an image. Further, in the image output by the image output module 20, the frame length of the low resolution image frame may be the same as the frame length of the high resolution image frame.
In an alternative embodiment, when the image output module 20 outputs an image, the line reading time when the low resolution image frame is output is twice the line reading time when the high resolution image frame is output.
Further, as shown in fig. 6, the high-resolution photographing device of the present invention further includes an exposure control module 80, when the image output module 20 outputs an image, the next frame is the high-resolution image frame, and the exposure control module performs exposure control in advance according to a preset scheme to meet the exposure time requirement of the high-resolution image frame.
In yet another alternative embodiment, when the image output module 20 outputs an image, a line reading time when the low resolution image frame is output and a line reading time when the high resolution image frame is output may be the same to reduce flicker.
Further, when the image output module 20 outputs an image, the high resolution image frame is output through the image sensor full size mode, and the low resolution image frame is output through the image sensor analog merge mode. For example, the high resolution image frame may employ a 50M pixel image and the low resolution image frame may employ a 25M pixel image.
Specifically, in an alternative embodiment, the resolution conversion module 50 converts the high resolution image in the continuous image output stream into a converted image frame with a low resolution according to the resolution of the low resolution image through an internal logic circuit and/or an external processing chip and/or a main control chip.
Preferably, as shown in fig. 7, the image processing module 70 includes an image selecting unit 71, configured to select, in the second buffer unit, the high resolution image frame in a preset scheme, where the preset scheme includes:
Selecting the high-resolution image frame closest to the shooting time; and/or the number of the groups of groups,
Selecting the nearest high-resolution image frame before the shooting time; and/or the number of the groups of groups,
And selecting the nearest high-resolution image frame after the shooting time.
On this basis, as shown in fig. 8, the image processing module 70 may further include an image fusion unit 72, configured to perform image fusion on the high-resolution image frame and the low-resolution image frames adjacent to the high-resolution image frame in the preset scheme, so as to form an output image.
Further, the resolution conversion module 50 further includes a parameter compensation unit 51, as shown in fig. 9, for performing parameter compensation on the converted image frame.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. Thus, the embodiments should be considered in all respects as illustrative and not restrictive. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the word "a" or "an" does not exclude a plurality. The elements recited in the apparatus claims may also be embodied by one element. The terms first, second, etc. are used to denote a name, but not any particular order.
Claims (28)
1. The method for realizing photographing of the high-resolution image is characterized by comprising the following steps of:
Acquiring a continuous image output stream when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
and transmitting the continuous image output stream to a buffer area so as to reduce the delay of photographing the high-resolution image.
2. The method for implementing high resolution image photographing as claimed in claim 1, further comprising, after said obtaining the continuous image output stream:
converting high resolution images in the continuous image output stream into converted image frames of low resolution according to the resolution of the low resolution images;
Replacing high-resolution image frames in the continuous image output stream with the converted image frames to form a shooting preview stream;
Transmitting the shooting preview stream to a first buffer memory, and transmitting the high-resolution image frame to a second buffer memory;
when a photo is taken, the high-resolution image frames in a preset scheme are selected from the second buffer memory to be processed and then output.
3. The method of claim 1, wherein one of the high resolution image frames is set in two of the low resolution image frames in the continuous image output stream.
4. The method of claim 1, wherein exposure times of the low resolution image frames and the high resolution image frames in the continuous image output stream are the same.
5. The method of claim 1, wherein a frame length of the low resolution image frames and a frame length of the high resolution image frames in the continuous image output stream are the same.
6. The method of claim 5, wherein a line reading time of the image sensor when outputting the low resolution image frame is twice a line reading time when outputting the high resolution image frame in the process of acquiring the continuous image output stream.
7. The method according to claim 5, wherein during the process of obtaining the continuous image output stream, when the next frame is the high-resolution image frame, the image sensor performs exposure control in advance according to a preset scheme to meet the exposure time requirement of the high-resolution image frame.
8. The method according to claim 1, wherein a line reading time of the image sensor when outputting the low resolution image frame is the same as a line reading time when outputting the high resolution image frame in the process of acquiring the continuous image output stream, so as to reduce flicker.
9. The method for realizing photographing of high resolution image according to claim 1, wherein the high resolution image frame is output through an image sensor full size mode, and the low resolution image frame is output through an image sensor analog merge mode.
10. The method for photographing a high resolution image according to claim 9, wherein said high resolution image frame uses a 50M pixel image and said low resolution image frame uses a 25M pixel image.
11. The method for implementing photographing of high resolution images as claimed in claim 2, wherein said converting high resolution images in said continuous image output stream into converted image frames of low resolution according to the resolution of said low resolution images comprises:
and converting the high-resolution image in the continuous image output stream into a low-resolution converted image frame according to the resolution of the low-resolution image through an internal logic circuit and/or an external processing chip and/or a main control chip of the image sensor.
12. The method for implementing photographing of a high-resolution image according to claim 2, wherein selecting the high-resolution image frame in the preset scheme in the second buffer includes:
Selecting the high-resolution image frame closest to the shooting time; and/or the number of the groups of groups,
Selecting the nearest high-resolution image frame before the shooting time; and/or the number of the groups of groups,
And selecting the nearest high-resolution image frame after the shooting time.
13. The method for implementing photographing of a high-resolution image according to claim 2, wherein selecting the high-resolution image frame in the preset scheme in the second buffer for processing includes:
and carrying out image fusion on the high-resolution image frames and a plurality of adjacent frames of the low-resolution image frames in the preset scheme to form an output image.
14. The method for implementing photographing of high resolution images as claimed in claim 2, wherein said converting high resolution images in said continuous image output stream into converted image frames of low resolution according to the resolution of said low resolution images further comprises:
and carrying out parameter compensation on the converted image frames.
15. A high resolution image photographing apparatus, comprising:
The output stream acquisition module is used for acquiring a continuous image output stream output by the image output module when photographing and previewing, wherein the continuous image output stream comprises a low-resolution image frame and a high-resolution image frame;
the frame number of the low-resolution image frames is not less than that of the high-resolution image frames, and at least one low-resolution image frame is inserted into two high-resolution image frames;
And the transmission module is used for transmitting the continuous image output stream to the buffer memory module so as to reduce the delay of photographing the high-resolution image.
16. The high resolution image photographing device according to claim 15, further comprising:
A resolution conversion module for converting the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image;
an image frame replacing module, configured to replace a high resolution image frame in the continuous image output stream with the converted image frame to form a shooting preview stream;
the transmission module transmits the shooting preview stream to the first buffer unit and transmits the high-resolution image frame to the second buffer unit;
and the image processing module is used for selecting the high-resolution image frames in a preset scheme from the second buffer unit for processing and outputting the processed high-resolution image frames when the picture is shot.
17. The apparatus of claim 15, wherein one of the high resolution image frames is set in two of the low resolution image frames when the image output module outputs an image.
18. The high resolution image photographing device according to claim 15, wherein the exposure time of the low resolution image frame and the high resolution image frame is the same when the image output module outputs the image.
19. The high-resolution image photographing device according to claim 15, wherein a frame length of the low-resolution image frame and a frame length of the high-resolution image frame are the same in the image outputted by the image output module.
20. The apparatus of claim 19, wherein the image output module outputs an image with a line read time twice as long as that of the low resolution image frame.
21. The apparatus of claim 19, further comprising an exposure control module that performs exposure control in advance according to a preset scheme to meet an exposure time requirement of the high-resolution image frame when the next frame is the high-resolution image frame when the image output module outputs an image.
22. The apparatus of claim 15, wherein the image output module outputs the image with the same line read time when outputting the low resolution image frame as when outputting the high resolution image frame to reduce flicker.
23. The high resolution image photographing device according to claim 15, wherein the image output module outputs the high resolution image frames through an image sensor full size mode and the low resolution image frames through an image sensor analog merge mode when outputting the image.
24. The high resolution image photographing device according to claim 23, wherein said high resolution image frame uses a 50M pixel image and said low resolution image frame uses a 25M pixel image.
25. The apparatus of claim 16, wherein the resolution conversion module converts the high resolution image in the continuous image output stream into a converted image frame of low resolution according to the resolution of the low resolution image through an internal logic circuit and/or an external processing chip and/or a main control chip.
26. The apparatus according to claim 16, wherein the image processing module includes an image selecting unit configured to select the high resolution image frame in a preset scheme in the second buffer unit, the preset scheme including:
Selecting the high-resolution image frame closest to the shooting time; and/or the number of the groups of groups,
Selecting the nearest high-resolution image frame before the shooting time; and/or the number of the groups of groups,
And selecting the nearest high-resolution image frame after the shooting time.
27. The apparatus of claim 16, wherein the image processing module includes an image fusion unit for performing image fusion on the high resolution image frame and the low resolution image frames adjacent to the high resolution image frame in the predetermined scheme to form an output image.
28. The high resolution image photographing device according to claim 16, wherein the resolution conversion module includes a parameter compensation unit for performing parameter compensation on the converted image frames.
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