Method and device for backlight compensation
A technology of backlight compensation and backlight state, which is applied in the field of backlight compensation, can solve the problems of unsatisfactory human eye comfort, loss of image smoothness and naturalness, and strong compensation, so as to improve image or video shooting quality and color saturation degree, improve the effect of user experience
Active Publication Date: 2017-04-05
BEIJING BAIDU NETCOM SCI & TECH CO LTD
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Problems solved by technology
[0004] At present, the post-processing end compensation technology has the following problems: (1) The detected backlight area is not accurate, resulting in the problem of excessive or too small compensation during the compensation process; (2) In the case of brightness compensation, the smoothness of the image The loss of nature and naturalness cannot meet the requirements of human eye comfort; (3) The computational complexity cannot meet the processing needs of smart mobile terminals such as Android
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[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents coming within the spirit and scope of the appended claims.
[0022] In the description of the present invention, it should be understood that the terms "first", "second" and so on are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "connected" and "connect...
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The present invention proposes a method and device for backlight compensation. The method includes the following steps: obtain the current frame image and determine whether it is in the backlight state; if it is in the backlight state, obtain the average contrast of the first component corresponding to the current frame image. , and determine whether the average contrast is greater than the first preset threshold; if it is less than or equal to the first preset threshold, obtain the adjustment coefficient of the first component according to the average contrast, and obtain the mean value of the second component corresponding to the current frame image; determine the mean value whether it is greater than the second preset threshold; if less than or equal to the second preset threshold, obtain the adjustment coefficient of the second component according to the mean; and adjust the first component and the second component respectively according to the adjustment coefficient of the first component and the adjustment coefficient of the second component. The second component is used to perform backlight compensation on the current frame image. According to the method of the embodiment of the present invention, the image or video shooting quality of the camera in the backlight state can be significantly improved, and the user experience can be improved.
Description
technical field [0001] The invention relates to the technical field of image processing, in particular to a backlight compensation method and device. Background technique [0002] When users use the camera to shoot or record video, they often encounter backlit scenes. In the backlit scene, the camera has the defect of insufficient brightness of the main body of the picture when imaging due to the target deviation of the exposure time control reference and the limited dynamic range of the photoelectric conversion device, resulting in a relatively dark picture. , seriously affecting the effect of taking pictures. [0003] In order to solve the above problems, pre-processing end compensation technology and post-processing end correction technology are mainly used at present. Among them, the pre-processing end compensation technology aims at the improvement or control of the imaging device by controlling the imaging process, such as the secondary exposure method, etc. The post-...
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IPC IPC(8): H04N5/243H04N9/04H04N23/76
Inventor 张志辉
Owner BEIJING BAIDU NETCOM SCI & TECH CO LTD