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61 results about "Medium exposure" patented technology

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

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.
Owner:上海中科辰新卫星技术有限公司
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