Bitstream compressor with higher compression ratio by selective use of file compression method

摘要

High compression bitstream compression apparatus according to the present invention; By selectively using the file compressor method, it has a higher compression ratio and a transmission rate. A quantization unit (HO) which receives a quantization step size parameter (QP) and quantizes a discrete cosine transformed number and outputs the quantized step, and an encoder (120,130) which outputs the quantized data by line length encoding and variable length encoding. The bitstream compression apparatus of the present invention has a compression section (l4O) for file-compressing and outputting the encoded bitstream data, and detects a rolling ratio from the recompression section (l4O), and corresponds to the compression ratio. And an adjusting unit 160 for outputting the adjusted quantization step size parameter QP to the quantization unit 110.