Automatic exposure control method based on image multi-threshold control

Abstract

The invention relates to an automatic exposure control method used in deep space exploration, and in particular to an automatic exposure control method based on image multi-threshold control, and aimsto solve the problems that an automatic exposure control method in the prior art easily causes excessive exposure of a space target in a visible light image under a space background and is not suitable for a spaceflight specific microprocessor in a deep space environment. The method comprises: firstly, setting a bright area threshold, a dark area threshold, a reasonable brightness threshold interval, an oversaturation threshold, an undersaturation threshold, an overbright threshold and an overdark threshold according to saturation values of an image sensor; calculating the current frame imageaccording to the image pixel value to obtain the average brightness, the saturated pixel number and the bright pixel number of the current frame of image; comparing the average brightness, the saturated pixel number and the bright pixel number of the current frame of image with a set threshold to determine whether to update the exposure time; and if the exposure time is updated, performing loop iteration on continuous frames until the image meets a set requirement, and ending the exposure control.

Description

technical field [0001] The invention relates to an automatic exposure control method used in deep space exploration, in particular to an automatic exposure control method based on image multi-threshold control. Background technique [0002] When the imaging device used in space exploration is working in orbit, the exposure time is very important. If the exposure time is too short, the scene will be dark, and if the exposure time is too long, the scene brightness will be saturated. Therefore, automatic exposure control is essential. It is also the core technology of the imaging device. [0003] The goal of automatic exposure control is to ensure that the details of the dark part of the image of the subject are not lost, the bright part is not exposed, and the average brightness is suitable for human eyes. However, automatic exposure control is very complicated. dark situation. [0004] In the working environment of the space exploration camera, the space background is a dar...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that the automatic exposure control method in the prior art tends to overexpose the space object in the visible light image under the space background, and is not suitable for the aerospace specific microprocessor in the deep space environment, and provides a An automatic exposure control method based on image multi-threshold control

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