Self-adaption space-based space target imaging exposure time control method and device

A technology of self-adaptive control and exposure time, applied in image communication, TV, color TV components and other directions, can solve problems such as poor real-time performance and complex algorithms, and achieve rich image content and information, simple algorithms, and high real-time performance. Effect

Active Publication Date: 2015-01-21
上海中科辰新卫星技术有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the automatic exposure time control method commonly used by existing commercial cameras is not suitable for the exposure time control of space-based space target imaging, and the algorithm of the automatic exposure time control method under research is relatively complex and h

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[0013] According to Shannon's information theory, when the entropy is the largest, the amount of information is the largest. Therefore, the larger the image information entropy value obtained by space-based space target imaging, the richer the image content and the more gray levels. The invention utilizes the global content of the image, selects a reasonable exposure time iteratively based on the image information entropy, and realizes adaptive control of the exposure time of the camera, so that the image content information obtained by space-based space object imaging is the most abundant. The method and device for adaptively controlling the imaging exposure time of space-based space targets provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] refer to figure 1 , a schematic flowchart of the method for adaptively controlling the imaging exposure time of a space-based space target according to the present i...

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Abstract

The invention provides a self-adaption space-based space target imaging exposure time control method and device. The method includes the steps of firstly, calculating the information entropy of corresponding images obtained according to the preset longest exposure time, the preset medium exposure time and the preset shortest exposure time; obtaining the theoretical optimal exposure time through a weighed average method according to all types of the information entropy, selecting one exposure time which is closest to the theoretical optimal exposure time from preset exposure time to serve as the current optimal exposure time, and recording the number of obtaining times of the current optimal exposure time; thirdly, judging whether the number of the obtaining times is smaller than or equal to a preset threshold value or not, executing the fourth step if the number of the obtaining times is smaller than or equal to the preset threshold value, and executing the sixth step if the number of the obtaining times is not smaller than or equal to the preset threshold value; fourthly, calculating the information entropy of the corresponding image which is obtained according to the current optimal exposure time; fifthly, renewing the longest exposure time, the medium exposure time, the shortest exposure time and the corresponding information entropy according to the current optimal exposure time, and executing the second step; sixthly, controlling an imaging camera to conduct unceasing imaging on a space target with the current optimal exposure time as the optimal exposure time.

Description

technical field [0001] The present invention relates to the field of space-based space object imaging, in particular to a space-based space object imaging exposure time adaptive control method and device for realizing adaptive control of camera exposure time based on information entropy. Background technique [0002] Under the constraints of space-based imaging conditions, the richness of image gray levels depends on the dynamic range of the sensor design itself. If the dynamic range of the sensor design is given, then choosing a reasonable exposure time and giving full play to the performance of the sensor itself can make the image content richest. [0003] At present, the automatic exposure time control methods commonly used in commercial cameras include central average metering, partial metering and spot metering. The most commonly used is central average metering, that is, when using conventional shooting, the subject is mostly located in the center of the field of view...

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Application Information

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IPC IPC(8): H04N5/235
Inventor 胡海鹰郑珍珍朱振才杨根庆
Owner 上海中科辰新卫星技术有限公司
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