吉林大学学报(工学版) ›› 2013, Vol. 43 ›› Issue (06): 1680-1684.doi: 10.7964/jdxbgxb201306039

• paper • Previous Articles     Next Articles

Real-time composing and compression of image within multi-channel spaceborne camera

LIU Chun-xiang1,2, GUO Yong-fei1, LI Ning1, XUE Xu-cheng1, LYU Heng-yi1   

  1. 1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-06-21 Online:2013-11-01 Published:2013-11-01

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Abstract:

In order to solve the problem of imaging system instability caused by high work frequency of the image composing circuit on the satellite, the camera structure was innovated. A composing and compression method of time delay integrate charge coupled device (TDICCD) based on field programmable gate array (FPGA) platform for satellite remote sensing data was proposed. First, the signal flow was improved. Then, based on TDICCD linear array push-broom imaging mode characteristics, an improved predictive code method based on least mean square (LMS) was used for composing and compression. Finally, experiments were conducted on a platform to validate the proposed method. Experimental results indicate that the system clock is reduced to 80 MHz and 60 MHz, respectively, from the original 110MHz in the lossless and 2 times compression. The peak signal-to-noise ratio (PSNR) of the reconstructed image is bigger than 84 dB;the average processing time of one line image is 57.3 μs, which is smaller than camera's smallest line period. The proposed algorithm is stable and it can achieve the composing and compression of multi-channel TDICCD remote image within the camera.

Key words: information processing technology, real-time composing and compression, self-adaptive prediction, push-broom remote-sensing camera

CLC Number: 

  • TP751

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