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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: 2009-05-27
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.

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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) Remove odd and idol element differences

[0059] The image data is output through two different electronic links, odd and even. Separate processing of odd and idol elements will inevitably introduce inconsistency and instability of even and odd signals. In order to solve this problem, on the basis of the image data after relative radiation correction, the average gray value difference between the odd and even column data can be calculated, and then the odd and even difference can be overlaid on the odd and even column data respectively, so that the odd and even pixels can be removed. Difference.

[0060] the following image 3 and Figure 4 Schematic diagrams of the inconsistency of the odd and even signals before and after the B star CCD2 camera goes into the sky, respectively. It can be clearly seen from the figure that the difference between the odd idols after the camera was taken to the sky has changed from the difference between the odd idols before the ca...

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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 fluctuation of 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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IPC IPC(8): H04N5/217H04N5/357
Inventor 郭建宁龙小祥曾湧王晓燕
Owner CHINA CENT FOR RESOURCES SATELLITE DATA & APPL
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