Exposure control method and device

An exposure control and histogram technology, applied in the field of image processing, can solve the problems of poor control stability, exposure control algorithm cannot be adaptively adjusted, etc.

Active Publication Date: 2017-05-24
湖南兴芯微电子科技有限公司
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  • Abstract
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Problems solved by technology

[0009] The technical problem to be solved by the technical solution of the present invention is that the existing exposure control algorithm cannot be adaptively adjusted according to scene changes, and the control stability is also poor

Method used

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  • Exposure control method and device

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Embodiment Construction

[0030] Please refer to figure 1 , the exposure control method based on the high dynamic range imaging device of the technical solution of the present invention comprises:

[0031] Step S1, calculating the scene average brightness AVG;

[0032]Step S2, perform scene recognition according to the scene illuminance evaluation SCENELUMA, the proportion of the bright area of ​​the histogram HP_PDF, and the proportion of the dark area of ​​the histogram LP_PDF, so as to obtain the target brightness value TARGET of the adaptive scene;

[0033] Step S3, adjusting the parameters of the image sensor according to the scene average brightness AVG and the target brightness value TARGET of the adaptive scene, so as to increase or decrease the image brightness.

[0034] Each step will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0035] Please refer to figure 1 , step S1, calculate scene average brightness AVG. Specifically, the front-en...

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Abstract

The technical scheme of the invention discloses an exposure control method and device. The exposure control method comprises the following steps: calculating an average brightness of a scene; performing scene recognition according to scene illumination evaluation, a histogram light region ratio and a histogram dark region ratio, so as to obtain a target brightness value of an adaptive scene; and adjusting parameters of an image sensor according to the average brightness of the scene and the target brightness value of the adaptive scene, so as to enhance or reduce the image brightness. The exposure control method and the device provided by the technical scheme of the invention adaptively adjust the complexity and diversity of the scene, and ensure the speed and stability of automatic exposure control.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an exposure control method and device. Background technique [0002] With the rapid progress and development of the technology industry, high-definition images and high-definition videos are becoming more and more popular. Artificial intelligence technologies such as hardware and unmanned driving are inseparable from the image signal processor as the front-end input of information acquisition, and the quality and performance of the acquired image directly determine the final quality and user experience of the device or product. As the foundation and core of the image signal processor, the 3A (auto exposure, auto focus and auto white balance) function plays a vital role in the imaging effect. How to realize the 3A function with superior functions, performance and adaptability has always been a The direction of industry focus and research, among which automati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235
CPCH04N23/71H04N23/73
Inventor 沈雨剪
Owner 湖南兴芯微电子科技有限公司
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