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

In order to solve the problem of imaging system instability caused by high work frequency of image composing circuit on the satellite, the camera's structure was improved, a composing and compression method of TDICCD based on FPGA platform for satellite remote sensing images was proposed. First, the principle of real-time composing and compression for multi-channel satellite remote sensing image was introduced. Then, based on TDICCD linear array push-broom imaging mode characteristics, line-based 2D-DWT integer lifting scheme was used. EBCOT of bit-plane and coding parallel structure was proposed. Composing and compression of image data was simultaneously achieved. At last, experiment platform for the validation was established. Experimental results indicate that the system clock reduce to 80 MHz and 64 MHz respectively from the original 100 MHz in the lossless and 2 times compression. Reconstruct image's PSNR is 84 dB that is bigger than 80 dB. The average processing time of one line image is 61.2 s that is smaller than camera's smallest line period. The proposed algorithm is stable and reliable. It achieves the composing and compression within camera, it satisfy engineering requirements.