A method and device for adaptive control of space-based space target imaging exposure time

Abstract

A method and device for adaptive control of space-based space object imaging exposure time, the method includes 1) calculating the information entropy of corresponding images obtained according to the preset longest, middle and shortest exposure times; 2) according to all the information entropy Obtain the theoretical optimal exposure time by means of weighted average, and then select the closest exposure time in the preset exposure time file as the current optimal exposure time, and record the acquisition times of the current optimal exposure time; 3) Judgment Whether the acquisition times is less than or equal to the preset threshold, if so, then perform step 4), otherwise perform step 6); 4) calculate the information entropy of the corresponding image acquired according to the current optimal exposure time; 5) according to the current optimal exposure Time update the longest, intermediate and shortest exposure time, and update the corresponding information entropy, and return to step 2); 6) Control the imaging camera to continuously image the 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...

AI Technical Summary

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 has poor real-time performance. Provide a method and device for self-adaptive control of exposure time of space-based space target imaging, which utilizes the global content of the image to achieve self-adaptive control of the camera's exposure time by selecting a reasonable exposure time, so that the acquired image content can be the most abundant

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