Method for improving relative radiation correction of CCD camera

A relative radiation correction, camera technology, applied in the field of satellite remote sensing image processing and analysis, can solve problems such as unsatisfactory effect, obvious image, chromatic aberration, etc., to achieve high practicability and application value, improve image quality, and clear ideas.

Active Publication Date: 2011-05-25
CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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Problems solved by technology

[0019] However, directly using the calibration coefficient calculated from the calibration data to perform relative radiometric correction on the actual image in orbit is not ideal, and the image still has obvious stripes or chromatic aberrations.

Method used

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  • Method for improving relative radiation correction of CCD camera
  • Method for improving relative radiation correction of CCD camera
  • Method for improving relative radiation correction of CCD camera

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specific Embodiment approach

[0058] (1) Removal of odd idol element difference

[0059] The image data is output by two different electronic links of parity and even. The separate processing of odd and even elements will inevitably introduce inconsistency and instability of parity signals. In order to solve this problem, on the basis of the image data after the relative radiation correction, the average gray value difference between the odd and even column data can be counted, and then the parity difference can be overlaid on the odd and even column data respectively to remove the odd image element. Difference.

[0060] the following image 3 and Figure 4 The schematic diagrams of the inconsistency of the odd-even signals before and after the B-star CCD2 camera goes up to the sky, respectively. It can be clearly seen from the picture that the difference between the strange idols after the camera goes to heaven and the difference between the strange idols before going to heaven has changed. Therefore...

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Abstract

The present invention relates to a method for improving the relative radiation calibration of a CCD camera. The method comprises: an improved scaling coefficient model is used for carrying out relative radiation calibration on images so as to eliminate fine stripe noise; based on the image data after the relative radiation calibration, the difference of average gray scale values between odd line data and even line data is counted; the difference of the average gray scale values is respectively covered on the odd line data and the even line data so as to remove odd and even image element difference; and a brightness difference value of a middle CCD array sub-image and a left and a right CCD array sub-images is obtained by image statistics, the brightness difference value is the fluctuationof the left and the right CCD array bottom level, and the fluctuation is used for compensating the offset value of the left and the right CCD arrays so as to remove the color difference of the three CCD arrays. The technical proposal of the present invention can effectively improve image quality so as to effectively remove the odd and even image element difference, stripe noise and the color difference in the arrays and between the arrays, and improve the relative radiation calibration precision of the images.

Description

technical field [0001] The invention belongs to the field of satellite remote sensing image processing and analysis, in particular to a method for improving the relative radiation correction of a CCD camera. Background technique [0002] With the application of remote sensing technology becoming more and more extensive, users have higher requirements for the quality and usability of image data. However, at present, domestic remote sensing images have certain problems in terms of radiation quality and geometric quality. The radiation quality is manifested in image chromatic aberration and fringe, which affects the quantification of remote sensing to a certain extent. [0003] Banding and noise, as well as chromatic aberration and distortion after spectral segment synthesis, are the main factors affecting the imaging consistency of optical remote sensing cameras. These effects are the result of the comprehensive effects of the various subsystems of the entire remote sensor. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/357
Inventor 郭建宁龙小祥曾湧王晓燕
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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