By using the characteristic of having few non-zero coefficient in the intra-frame 8*8 macro-block high bit-plane,we apply a dynamic bit rate allocation method to improve the coding efficiency in mid bit rate range by about 0.5dB.

• 利用帧内区域8*8宏块高位平面非零系数很少的特点；提出了动态码率分配算法；使在中等码率范围内编码效率提高了0.；5dB左右