| With the development of digital information network, the radar is becoming increasingly popular in the military field and civilian areas. Especially the radar image compression and long-distance transmission, which has gradually become a hot point of the majority of scholars. The radar image owns the characteristics of high resolution and large quantity of information. But the instability of the remote transmission network bandwidth resulted in reconstruction failure and distortion of recoveried display when the radar images are compressed and remotely transmited. Therefore, in radar image compression and remote transmission, the problem of ensuring high compression ratio and high quality transmission need to be solved urgently.First of all, on the base of a synthetic study of the various domestic and international compression algorithm as well as the coding standard. Taking the radar image particularity of the background region into consideration, the region of interest (ROI)coding algorithm was adopted in this paper. The ROI algorithm was improved based on the available transmission network bandwidth. The code rate of the image compression was made to adapt to the network current available bandwidth automatically. The weight function of the code block was constructed on the base of available bandwidth. The code rate of the image with region of interest code block and region of background code block were distributed reasonably. Then the image reconstruction quality of interested region was improved.Secondly, the multilink polymerization algorithm and the multilink load balancing algorithm were analyzed for the radar image remote transmission. In the radar image remote transmission, the transmission bandwidth was normally more than IMB/s, so the single field wire link or wireless AP link cannot meet the demand of the radar image remote transmission. Multilink technology was adopted in this paper to ensure the quality of radar image remote transmission. Several covered wires and wireless AP links were combined. The load balance algorithm was used to allocate the transmission data to each link balancedly, making universal use of every link.Finally, on the basis of the RTP transmission protocol, the VC++was used to design the radar image compression and transmission system. It is shown in the results that high quality of radar image compression and remote transmission was achieved in this system. The relative streams weight of the interested region and the background area was adjusted adaptively based on the available size of the bandwidth in the network. Then the reconstruction quality of radar image interested region in the unstable network has been improved.In summary, on the basis of the study of the compression algorithm based on the region of interest and the remote transmission algorithm based on multi-link load-balancing. The ROI compression algorithm was optimized when the network bandwidth was unstable. The compression code rate and the available bandwidth were adjusted to each other automatically. The high-quality transmission and reconstruction of the region of interest in the radar image transmission under low bandwidth were ensured. The reconstruction failure and recovery display distortion of radar images remote transmission were avoided. |
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