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CDD image aberration elimination method based on nearest statistics

A reference image and image technology, applied in the field of image processing, can solve problems such as poor effect of eliminating color difference, complex algorithm, etc., achieve good effect, intuitive algorithm, and improve the effect of artificial intelligence components

Inactive Publication Date: 2014-07-30
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is: to overcome the deficiencies of the prior art, provide a method for eliminating color difference of CCD images based on nearest neighbor statistics, and solve the problems of complex algorithms and poor effect of eliminating color difference in the prior art

Method used

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  • CDD image aberration elimination method based on nearest statistics
  • CDD image aberration elimination method based on nearest statistics
  • CDD image aberration elimination method based on nearest statistics

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Embodiment

[0036] Taking the splicing of three CCDs as an example, each CCD is called the left CCD, the middle CCD and the right CCD according to the position, such as figure 2 shown. Each band of the CCD camera image is processed according to the following steps:

[0037] (1) According to the dynamic range of the gray value of the CCD camera image, determine a CCD imaging with a large dynamic range as the reference image; assume that the middle CCD is determined as the reference image according to the dynamic range of the gray value of the image; then the left CCD and the right The two CCDs are images adjacent to the reference image, and they are all images to be processed in the next step. The processing between the two is not sequential. In this example, the left CCD is processed first, and then the right CCD is processed.

[0038] (2) Calculate the mean value of a row of gray values ​​on the leftmost edge of the middle sheet CCD, calculate the mean value of the rightmost row of gra...

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Abstract

A CDD image aberration elimination method based on nearest statistics comprises the steps that (1) a CCD with the largest dynamic range is selected as a datum image without aberration; (2) a CCD image adjacent to the datum image is used as an image to be processed, a column of pixels, adjacent to the edge of the image to be processed, of the datum image are selected, the average value of gray values of the column of pixels of the datum image at a certain waveband is calculated, the average value of gray values of a column of pixels, adjacent to the edge of the datum image, of the image to be processed at the same waveband is calculated at the same time, and the difference value of the two average values is calculated; (3) the obtained difference value is added to all pixels of the image to be processed, and then elimination of the aberration of the image to be processed at the waveband in the step (2) is completed; (4) the step (2) and the step (3) are executed repeatedly for other wavebands, and then elimination of the aberration of the image to be processed is completed; (5) the image to be processed without aberration is used as a new datum image, and the step (2), the step (3) and the step (4) are executed repeatedly till imaging processing of all CCDs is completed.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for eliminating chromatic aberration of a CCD image of a remote sensing satellite, and is suitable for eliminating the chromatic aberration between slices of a CCD camera image spliced ​​by two or more CCDs. Background technique [0002] The CCD cameras of CBERS-1 series satellites (CBERS-01, 02, 02b) are all spliced ​​by three CCD linear arrays. When the satellites are in orbit, the calibration coefficients of the laboratory are used to correct the CCD images, and the correction effect is not ideal. Concentrating on the difference in the response of the three linear arrays of the CCD image, preliminary research believes that it is caused by the low-level instability of the CCD camera. [0003] The responses of the three CCDs of China-Brazil Satellite Resources Satellite to ground objects are inconsistent, resulting in the images of the three CCDs having no color ...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 黄世存傅俏燕曾湧王奇郭朝辉
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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