CN114286014A - Image database acquisition method - Google Patents
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- CN114286014A CN114286014A CN202111640347.9A CN202111640347A CN114286014A CN 114286014 A CN114286014 A CN 114286014A CN 202111640347 A CN202111640347 A CN 202111640347A CN 114286014 A CN114286014 A CN 114286014A
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Abstract
The invention relates to an image database acquisition method, which is used for acquiring a human face image at a mobile terminal with high quality. The method comprises the following steps: the mobile terminal receives a face image acquisition instruction, starts a front camera and detects the brightness of the environment; adjusting the screen brightness of the mobile terminal to enable the ambient light brightness to reach a preset value; acquiring a real-time face image, and determining a face pitch angle and an azimuth angle based on the posture of the face image; judging whether the pitch angle and the azimuth angle are within a preset range, and if not, sending a prompt for adjusting the pitch angle and the azimuth angle; if the color temperature of the ambient light is within the preset range, detecting the color temperature of the ambient light; determining a supplementary lighting color according to the ambient light color temperature, and adjusting the screen light color; and instructing the front camera to collect a face image. The method greatly improves the image quality of face image acquisition and can obtain better user experience.
Description
Technical Field
The invention relates to the technical field of image acquisition, in particular to an image database acquisition method.
Background
The face image acquisition at the mobile terminal is a common technology. In the prior art, when a mobile terminal collects a face image, due to the problem of face shooting angle and light, an image with high quality is difficult to collect. The chinese patent publication No. cn108447159.a discloses a method for adjusting the direction of a camera according to the pitch angle and azimuth angle of a collected face, so that the relative angle between the camera and the face meets the requirement of a preset angle. However, the method does not consider the application situation of the mobile terminal, and does not consider the influence of the human face or the camera moving at different angles on the requirement of the shooting light, so that the human face image with high quality requirement is difficult to acquire.
Disclosure of Invention
The invention provides an image database acquisition method, which is used for acquiring a human face image at a mobile terminal with high quality.
The embodiment of the invention is as follows:
an image database collection method, comprising the steps of: the mobile terminal receives a face image acquisition instruction, starts a front camera and detects the brightness of the environment; adjusting the screen brightness of the mobile terminal to enable the ambient light brightness to reach a preset value; acquiring a real-time face image, and determining a face pitch angle and an azimuth angle based on the posture of the face image; judging whether the pitch angle and the azimuth angle are within a preset range, and if not, sending a prompt for adjusting the pitch angle and the azimuth angle; if the color temperature of the ambient light is within the preset range, detecting the color temperature of the ambient light; determining a supplementary lighting color according to the ambient light color temperature, and adjusting the screen light color; and instructing the front camera to collect a face image.
Further, the adjusting the screen brightness of the mobile terminal includes: acquiring the current screen brightness; acquiring the brightness of the face image and the brightness of the environment light; adjusting the screen brightness, and monitoring the changes of the human face image and the ambient light brightness; and when the brightness of the face image and the brightness of the environment reach the preset values, stopping adjusting the screen brightness, and taking the screen brightness at the moment as the screen brightness when the face image is collected.
And further, dividing the screen into a display area, a light supplement area and a temperature supplement area, wherein the display area is used for displaying the face image, the light supplement area is used for adjusting the brightness of the environment light, and the temperature supplement area is used for adjusting the color temperature of the environment.
Further, the display area, the light supplement area and the temperature supplement area are equally divided into the screen.
Furthermore, the display area, the light supplement area and the temperature supplement area can adjust the size of each area according to the light supplement intensity and the temperature supplement intensity.
Further, the adjusting the size of each region comprises the following steps: the display area, the light supplement area and the temperature supplement area are equally divided into the screen; adjusting the brightness of the light supplement area, and keeping the area of the current light supplement area if the ambient light brightness reaches a preset value before the light supplement area reaches the maximum brightness; when the light supplement area reaches the maximum brightness, if the ambient light brightness does not reach a preset value, increasing the area of the current light supplement area, and simultaneously reducing the areas of the display area and the temperature supplement area; adjusting the brightness of the temperature compensation area, and keeping the area of the current temperature compensation area if the ambient light temperature reaches a preset value before the temperature compensation area reaches the maximum brightness; and when the temperature compensation area reaches the maximum brightness, if the ambient light temperature does not reach a preset value, increasing the area of the current temperature compensation area, and reducing the area of the display area.
Further, the supplementary lighting area is white light.
Further, the detecting the color temperature of the ambient light includes: analyzing pixels of the face image to determine a color temperature level of each of the pixels; and counting the number of pixels corresponding to each color temperature level, and taking the color temperature level with the most pixels as the color temperature of the ambient light.
Further, the determining a fill-in color according to the ambient light color temperature and adjusting the screen light color include: calculating a supplementary lighting color temperature according to the ambient light color temperature; and determining the supplementary lighting color according to the supplementary lighting color temperature.
Further, before the face image is collected, a gray scale method is adopted for white balance processing.
According to the image database acquisition method provided by the invention, before the image is acquired, the user is prompted to adjust the shooting angle by identifying the pitch angle and the azimuth angle of the face, the ambient light brightness and the color temperature are identified, the brightness and the color temperature of the ambient light are adjusted by adjusting the screen light, and the face image is acquired under the condition that the shooting angle and the light meet the requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a method for collecting images in an image database;
fig. 2 is a schematic diagram of screen area division.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
According to an embodiment of the present invention, an image database collection method is provided, and fig. 1 is a flowchart of the image database collection method, including the following steps: the mobile terminal receives a face image acquisition instruction, starts a front camera and detects the brightness of the environment; adjusting the screen brightness of the mobile terminal to enable the ambient light brightness to reach a preset value; acquiring a real-time face image, and determining a face pitch angle and an azimuth angle based on the posture of the face image; judging whether the pitch angle and the azimuth angle are within a preset range, and if not, sending a prompt for adjusting the pitch angle and the azimuth angle; if the color temperature of the ambient light is within the preset range, detecting the color temperature of the ambient light; determining a supplementary lighting color according to the ambient light color temperature, and adjusting the screen light color; and instructing the front camera to collect a face image.
In a preferred embodiment of the present invention, the adjusting the screen brightness of the mobile terminal includes: acquiring the current screen brightness; acquiring the brightness of the face image and the brightness of the environment light; adjusting the screen brightness, and monitoring the changes of the human face image and the ambient light brightness; and when the brightness of the face image and the brightness of the environment reach the preset values, stopping adjusting the screen brightness, and taking the screen brightness at the moment as the screen brightness when the face image is collected.
In a preferred embodiment of the present invention, the screen is divided into a display area, a light supplement area and a temperature supplement area, the display area is used for displaying the face image, the light supplement area is used for adjusting the brightness of the ambient light, and the temperature supplement area is used for adjusting the color temperature of the ambient light.
In a preferred embodiment of the present invention, the display area, the light supplement area, and the temperature supplement area are all divided into the screen.
In a preferred embodiment of the present invention, the display area, the light supplement area, and the temperature supplement area may adjust the size of each area according to the light supplement intensity and the temperature supplement intensity.
In a preferred embodiment of the present invention, the adjusting the sizes of the respective regions, as shown in fig. 2, comprises the following steps: the display area, the light supplement area and the temperature supplement area are equally divided into the screen; adjusting the brightness of the light supplement area, and keeping the area of the current light supplement area if the ambient light brightness reaches a preset value before the light supplement area reaches the maximum brightness; when the light supplement area reaches the maximum brightness, if the ambient light brightness does not reach a preset value, increasing the area of the current light supplement area, and simultaneously reducing the areas of the display area and the temperature supplement area; adjusting the brightness of the temperature compensation area, and keeping the area of the current temperature compensation area if the ambient light temperature reaches a preset value before the temperature compensation area reaches the maximum brightness; and when the temperature compensation area reaches the maximum brightness, if the ambient light temperature does not reach a preset value, increasing the area of the current temperature compensation area, and reducing the area of the display area.
In a preferred embodiment of the present invention, the supplementary light region is white light.
In a preferred embodiment of the present invention, the detecting the color temperature of the ambient light includes: analyzing pixels of the face image to determine a color temperature level of each of the pixels; and counting the number of pixels corresponding to each color temperature level, and taking the color temperature level with the most pixels as the color temperature of the ambient light.
In a preferred embodiment of the present invention, the determining a fill-in color according to the color temperature of the ambient light and adjusting the color of the screen light includes: calculating a supplementary lighting color temperature according to the ambient light color temperature; and determining the supplementary lighting color according to the supplementary lighting color temperature.
In a preferred embodiment of the present invention, before the face image is collected, a gray scale method is further adopted to perform white balance processing.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. An image database collection method, comprising the steps of:
the mobile terminal receives a face image acquisition instruction, starts a front camera and detects the brightness of the environment;
adjusting the screen brightness of the mobile terminal to enable the ambient light brightness to reach a preset value;
acquiring a real-time face image, and determining a face pitch angle and an azimuth angle based on the posture of the face image;
judging whether the pitch angle and the azimuth angle are within a preset range, and if not, sending a prompt for adjusting the pitch angle and the azimuth angle; if the color temperature of the ambient light is within the preset range, detecting the color temperature of the ambient light;
determining a supplementary lighting color according to the ambient light color temperature, and adjusting the screen light color;
and instructing the front camera to collect a face image.
2. The image database collection method according to claim 1, wherein said adjusting the screen brightness of the mobile terminal comprises:
acquiring the current screen brightness;
acquiring the brightness of the face image and the brightness of the environment light;
adjusting the screen brightness, and monitoring the changes of the human face image and the ambient light brightness;
and when the brightness of the face image and the brightness of the environment reach the preset values, stopping adjusting the screen brightness, and taking the screen brightness at the moment as the screen brightness when the face image is collected.
3. The image database collection method according to claim 1, wherein the screen is divided into a display area, a supplementary lighting area and a temperature compensation area, the display area is used for displaying the face image, the supplementary lighting area is used for adjusting the ambient light brightness, and the temperature compensation area is used for adjusting the ambient color temperature.
4. A database of images gathering method as claimed in claim 3 wherein the display area, fill area and temperature area are equally divided across the screen.
5. The method of claim 3, wherein the display area, the fill-in area, and the temperature compensation area are adjustable according to fill-in intensity and temperature compensation intensity.
6. The method of image database acquisition of claim 5, wherein said adjusting the size of the respective region comprises the steps of:
the display area, the light supplement area and the temperature supplement area are equally divided into the screen;
adjusting the brightness of the light supplement area, and keeping the area of the current light supplement area if the ambient light brightness reaches a preset value before the light supplement area reaches the maximum brightness; when the light supplement area reaches the maximum brightness, if the ambient light brightness does not reach a preset value, increasing the area of the current light supplement area, and simultaneously reducing the areas of the display area and the temperature supplement area;
adjusting the brightness of the temperature compensation area, and keeping the area of the current temperature compensation area if the ambient light temperature reaches a preset value before the temperature compensation area reaches the maximum brightness; and when the temperature compensation area reaches the maximum brightness, if the ambient light temperature does not reach a preset value, increasing the area of the current temperature compensation area, and reducing the area of the display area.
7. The image database collection method of claim 6, wherein the fill-in area is white light.
8. The image database acquisition method of claim 1, wherein the detecting an ambient light color temperature comprises:
analyzing pixels of the face image to determine a color temperature level of each of the pixels;
and counting the number of pixels corresponding to each color temperature level, and taking the color temperature level with the most pixels as the color temperature of the ambient light.
9. The method of claim 1, wherein determining a fill-in color from the ambient light color temperature and adjusting the screen light color comprises:
calculating a supplementary lighting color temperature according to the ambient light color temperature;
and determining the supplementary lighting color according to the supplementary lighting color temperature.
10. The image database collection method of claim 1, wherein a gray scale process is further applied to perform white balance processing prior to collecting the face image.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111640347.9A CN114286014A (en) | 2021-12-29 | 2021-12-29 | Image database acquisition method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111640347.9A CN114286014A (en) | 2021-12-29 | 2021-12-29 | Image database acquisition method |
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| CN114286014A true CN114286014A (en) | 2022-04-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114827485A (en) * | 2022-04-25 | 2022-07-29 | 智道网联科技(北京)有限公司 | Light supplementing method and system for vehicle camera |
| CN115965857A (en) * | 2023-01-09 | 2023-04-14 | 钧捷智能（深圳）有限公司 | Ambient light processing method and DMS system |
-
2021
- 2021-12-29 CN CN202111640347.9A patent/CN114286014A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114827485A (en) * | 2022-04-25 | 2022-07-29 | 智道网联科技(北京)有限公司 | Light supplementing method and system for vehicle camera |
| CN115965857A (en) * | 2023-01-09 | 2023-04-14 | 钧捷智能（深圳）有限公司 | Ambient light processing method and DMS system |
| CN115965857B (en) * | 2023-01-09 | 2024-05-10 | 钧捷智能（深圳）有限公司 | Ambient light processing method and DMS system |
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