【摘要】 对JPEG2000的率失真优化截取的嵌入式码块编码算法的各编码块截断过程数进行了分析,对大量的图像进行实验后发现,图像的每个编码块是在相近的过程数截断,于是提出了一种同一过程截断算法。在此基础上又提出了渐进过程数截断编码算法,最终这个算法舍去了复杂的率失真计算,降低了T2编码器设计难度,提高了JPEG2000系统的处理速度,减少了存储量,对硬件实现是很好的新方法,处理512×512的8bits位深的图像16倍压缩为250fps。更多还原

【Abstract】 Some analysis is focused on each code block passing number of EBCOT (embedded block coding with optimized truncation) inJPEG2000. Through experiments on lots of images, a conclusion can be made that each code block truncates at similar code block passing numbers.Hence this paper addresses a truncation algorithm in the equal-coding pass. Furthermore based on the above algorithm, a progressive passing-numbertruncation coding algorithm (PPNTC) is proposed which discards complicated rate-distortion calculation and makes it easy for the design of T2coder. This algorithm speeds up the processing of JPEG2000 and saves the memory cost. It can be realized more easily on hardware system. Thesystem shows the developed scheme meets the high-speed requirement of the real-time coding 250fps.更多还原