Imaging method of MM-CCD

Abstract

The present invention provides an imaging method of MM-CCD. A MM-CCD is obliquely arranged, so that the included angle between the MM-CCD and the flight direction of the satellite is arctan (1/n), n is a positive integer, and n is smaller than the number of pixel rows of the MM-CCD; when the MM-CCD is not placed obliquely, the pixel length and the sampling step length of MM-CCD along the flight direction of the satellite are both d.After the CCD is obliquely placed according to the step A, the sampling step length of the MM-CCD is set to take 1 + n2 times of sampling as a cycle, and when sampling is carried out for 1 + n2 + 1 times, imaging position of the m-1th column of pixels in the a+n row of pixels of the MM-CCD is overlapped with the imaging position of the m column of pixels in thea row of pixels of the MM-CCD, wherein m is a positive integer and is smaller than MM-CCD pixel column number; and pixel demixing is carried out on the 1 + n2 sequence images obtained in the period, so that the resolution of the obtained images in the satellite flight direction and the vertical direction is improved to be twice of the original resolution. According to the invention, more non-redundant information is contained, and the image resolution can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of remote sensing satellite images, in particular to an MM-CCD imaging method of a satellite camera. Background technique [0002] Charge Coupled Devices CCD (Charge Coupled Devices) is a new type of semiconductor device developed in the early 1970s. In the late 1960s, BOYLE WS and SIMTH GS of Bell Laboratories in the United States discovered the phenomenon of charge transfer through semiconductor potential wells, proposed a new concept of charge coupling, and also predicted the device in signal processing and signal storage. and its application prospects in image sensing. [0003] CCD is divided into two types according to its pixel arrangement: linear array (liner) CCD and area array (Area) CCD. The area array CCD device is composed of a photosensitive unit, a transfer gate, a shift register and some auxiliary input and output circuits. When working, the light signal is sampled by the photosensitive uni...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional area array CCD has the following defects in the application of remote sensing satellite images: the signal readout and transmission bandwidth is narrow, so the transmission capability is poor

On the other hand, the resolution of the images sampled by the area array CCD is not high, which is not conducive to further analysis and utilization

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