A Rate Control Algorithm Of JPEG-LS Near-lossless Image Compression And Its Hardware Implemention

With rapid development of space technology,the quantity of images acquiring from satellite grows faster than in the past.However,the hardware resource and transmission bandwidth of satellite is limited.It is important to design a high performance satellite image compression to make it easy for storing and transmitting satellite images.JPEG-LS is a lossless/near-lossless image compression standard based on LOCOI algorithm proposed by HP laboratory.This algorithm accomplishes image compression based on prediction,and performs well in satellite image compression.It is easy to implement in low complexity on FPGA.Unfortunately,its bit rate is hard to control,which limits its use.So it is necessary to propose a bit rate control algorithm for the compression method.A bit rate control algorithm based on a dynamic bit rate table is proposed after a detailed analysis of JPEG-LS image compression standard.Test shows that this algorithm can restrict the bit rate to the desired value rapidly in the progress of image compression and get a high-performance in the reconstruction image compared to the methods in the state of art.Moreover,a JPEG-LS near-lossless image compression system described in Verilog HDL is proposed on FPGA based on the algorithm.It promotes the compression efficiency.The system can achieve a speed of 60 M Pixel/s.