摘要
MPEG-4 FGS是MPEG-4中精细可扩展性编码方法,由于采用帧8*8交织的位平面编码结构,无法支持帧内区域级的动态码率分配,不适合基于内容的增强和流化传输,针对MPEG-4 FGS这编码限制,本文根据MPEG-7的内容描述标准,提出了一种基于帧内区域的细粒度可扩展A-FGS编码,实现了实时的帧内区域流化编码,并就该编码提出了一种最优码率分配算法.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.
MPEG-4 FGS is a fine-grain scalable coding method for MPEG-4. The 8 ＊ 8 flame interlaced bit-plane coding structure used by the MPEG-4 FGS coding does not support intra-frame dynamic bit rate allocation, and therefore is incapable of supporting content-based streaming transport. Regarding the limitation of the MPEG-4 FGS coding, we propose an intra-frame finegranular scalable coding method （A-FGS） based on the MPEG-7 content description standard to achieve the goal of real-time intra-frame streaming coding.An optimal bit rate allocation algorithm is also provided for the A-FGS coding method.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.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2007年第4期761-765,共5页
Acta Electronica Sinica
基金
国家自然科学基金(No.6057313260503063)
深圳市项目(No.200507)
关键词
FGS
可扩展编码
码率分配
fine granularity scalable
scalable coding
rate allocation
