Space camera self-adaption exposure method

Abstract

The invention discloses a space camera self-adaption exposure method. A space camera for imaging and a photometric camera for obtaining scene information in advance are involved in the method. The method includes the following steps that the photometric camera shoots an image in a target imaging zone with exposure time and gain set according to saturated radiance and camera responsivity, and a photometric image is obtained; the relation between the pixel gray value of the photometric image and the relative radiance of the photometric camera is determined according to the exposure time, the gain and the focal length set when the photometric camera shoots the photometric image, the photometric image is traversed, and a relative radiance graph of the photometric image and the maximum relative radiance in the photometric image are obtained; the maximum relative radiance in the photometric image is converted into the relative radiance of the space camera; the scene maximum relative radiance obtained in actual measurement is set as the saturated radiance of the space camera, the dynamic range of the camera is fully utilized when the apparent radiance is smaller than the saturated radiance, and the problems that part of images are dark on the whole, and the images are insufficient in gradation are solved.

Description

technical field [0001] The invention relates to an exposure method of a space camera which uses a remote sensing satellite or a space station as a platform to observe the earth. Involving patent classification G03 Photography; cinematography; similar techniques utilizing waves other than light waves; electrography; holography G03B Apparatus or equipment for photography, projection or viewing; similar techniques utilizing waves other than light waves Apparatus or equipment; and related accessories G03B7 / 00 Controlling exposure by adjusting the shutter, aperture, and filter separately or jointly G03B7 / 08 Controlling entirely by the response of the photosensitive device installed in the machine to the light intensity it receives. Background technique [0002] When the space camera orbits the earth, the scene may change from ocean to land, from town to desert, the reflectivity of the ground scene may change from about 0.05 to about 0.8, the change is very large, and the weather ...

AI Technical Summary

Problems solved by technology

Li Xiansheng and others from Changchun Institute of Optics and Mechanics proposed the concept of space camera on-orbit imaging mode, studied the method of establishing space camera imaging mode, but failed to make full use of the dynamic range of the camera according to the scene content

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