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An automatic exposure method for large aperture and large field of view cameras applied to aircraft

An automatic exposure, large-diameter technology, applied in TV, color TV, color TV components and other directions, can solve problems such as difficulty in obtaining optimal exposure parameters, oscillation of exposure results, complex calculation methods, etc. Robust, accurate parameter calculation effect

Active Publication Date: 2022-05-10
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that it is difficult to obtain the optimal exposure parameters in the existing large-aperture and large-field-of-view cameras used in aircraft, resulting in slow exposure convergence or oscillation of exposure results, or complex calculation methods, and difficult to realize engineering applications. An automatic exposure method for large aperture and large field of view cameras applied to aircraft

Method used

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  • An automatic exposure method for large aperture and large field of view cameras applied to aircraft
  • An automatic exposure method for large aperture and large field of view cameras applied to aircraft
  • An automatic exposure method for large aperture and large field of view cameras applied to aircraft

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[0075] Take a visible light camera with an image size of 4096*5120, 8tap / 10bit mode, and a frame rate of 20Hz as an example. The camera output pixel bit width is 10bit, the exposure time is adjustable from 50μs to 1500ms, and the minimum exposure time resolution is 1μs. One of the images is randomly selected for implementation, and the image exposure time is T=400 μs. To avoid repetition, only key data are listed:

[0076] 1) The window size is 256*256, such as image 3 and Figure 4 shown;

[0077] 2) Take γ=[0.3,0.5,0.7,1.0,1.2,1.4,1.5,1.7]8 values, o=0.055, s=0.018, the γ transformation curve is as follows figure 2 As shown, the transformed image is as Figure 5 shown.

[0078] 3) Calculate the dual energy gradient of the image in the window under different γ values, such as image 3 and Figure 4 shown.

[0079] 4) Sort the dual energy gradients in the window obtained by different γ values, and obtain the corresponding γ=0.7 corresponding to the maximum dual ener...

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Abstract

The invention relates to an automatic exposure method for a large-diameter and large-field-of-view camera applied to an aircraft, and its purpose is to solve the problem that existing automatic exposure methods for large-diameter and large-field-of-view cameras used in aircraft are difficult to obtain optimal exposure parameters, resulting in exposure convergence It is slow or the exposure result oscillates, or the calculation method is complicated, and it is difficult to realize the problem of engineering application. The method comprises the following steps: 1) receiving an image and opening a central window; 2) transforming the windowed image with different gamma values ​​to realize bit width compression and brightness adjustment of the image; 3) calculating images in the window under different gamma values double energy gradient G(i,j); 4) Find the γ value corresponding to the maximum double energy gradient; 5) Find the exposure time T' of the next frame image; 6) Calculate the exposure time T' of the next frame image Compare the absolute value ΔT of the difference with the current image exposure time T with the preset threshold ΔT0 to determine the next frame image exposure time; 7) Issue the next frame image exposure time command to the camera.

Description

technical field [0001] The invention relates to a camera automatic exposure method, in particular to an automatic exposure method for a camera with a large diameter and a large field of view applied to an aircraft. Background technique [0002] The use of large-diameter and large-field cameras on aircraft is playing an increasingly important role in various fields. It mainly uses imaging to complete the identification, tracking and positioning of targets. The sensor performs imaging by receiving the infrared or visible light information radiated or reflected by the target, and feeds the imaging data back to the back-end image processing unit to realize the detection, identification, tracking and positioning of the target, providing strong support for the identification, tracking and positioning of the target. The imaging quality of the camera plays a decisive role in the recognition, tracking and positioning of the target. The large-aperture large-field-of-view camera used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232H04N5/235
CPCH04N23/80H04N23/69H04N23/73H04N23/70
Inventor 王举贤高鹏肖茂森陆卫国王海霞张文博王致强
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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