High Performance ADV212 Controller for Applications of the Large Field of View TDICCD Space Camera

Because ordinary ADV212 controllers of compression scheme based on ADV212 cannot satisfy the demands of space camera, a high performance ADV212 controller for space camera is proposed in this paper. The working principle of ADV212 is first analyzed and then a working mechanism of custom-specific mode is presented. In the custom-specific mode, the frame is constructed by using the ping-pong operation of SDRAM and an ADV212 is applied to compress five-channel CCD data by pipelining. The interface among CCD, ADV212 and SDRAM is managed by interrupt handling strategy. Moreover, the three parameters which affect the quality of image compression are analyzed. The verification experiments to ADV212 compression system show that compression system works fast and stably. The time needed in compressing a frame image is only 7.68 ms, all PSNRs are more than 30 dB in the compression ratio of 2:1 to 32:1, and the average PSNR is increased by 2.49 dB in the lossy compression mode when the compression ratio is 1 bpp. The performances of the proposed controller effectively meet the requirement of applications of the large field of view TDICCD space camera.