Non-effective pixel on-orbit detection method

Abstract

The invention discloses a non-effective pixel on-orbit detection method. The method comprises the steps of selecting one or more targets from natural targets to serve as class uniform sources; under different solar elevation angles and different integral time, performing multi-time imaging on a region where the one or more selected class uniform sources are located to obtain a plurality of remote sensing images; performing normalization processing on the remote sensing image meeting a set condition in the remote sensing images to obtain a Num-scene uniformed remote sensing image; converting the Num-scene uniformed remote sensing image into a matrix vector expression, and according to the matrix vector expression, performing judgment to obtain actually measured non-effective pixels; and according to the positions of the actually measured non-effective pixels and the positions of reference non-effective pixels, obtaining a non-effective pixel position set of a variable integral time area array CMOS during an on-orbit period. Through the method, on-orbit detection of non-effective pixels of a visible light near-infrared area array CMOS camera is realized and the imaging quality of the images is ensured.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an on-orbit detection method of invalid pixels. Background technique [0002] Visible and near-infrared area array CMOS (Complementary Metal Oxide Semiconductor, Complementary Metal Oxide Semiconductor) cameras have tens of thousands of pixels, and can directly obtain digital images of pixel array targets reflecting sunlight energy. However, due to process limitations, area array There is an unavoidable problem in CMOS cameras, that is, the existence of invalid pixels. In CMOS cameras, invalid pixels mainly appear as pixels with low response and high response. The existence of invalid pixels seriously affects the quality of image imaging. If it is not considered (compensated) during imaging, dark spots and bright spots that cannot reflect the real characteristics of the target will appear in the image. [0003] In the field of aerospace, before the satellite...

AI Technical Summary

Problems solved by technology

However, due to factors such as changes in the space environment and aging of components during and after the launch of the satellite, there will be new invalid pixels that are not detected by the laboratory, and the new invalid pixels cannot be detected by existing solutions , and then the new invalid pixels cannot be compensated, which affects the quality of image formation

Images