Rensselaer Polytech. Inst., Troy, NY.
IEEE Trans Image Process. 1992;1(1):31-48. doi: 10.1109/83.128029.
The authors describe a design approach, called 2-D entropy-constrained subband coding (ECSBC), based upon recently developed 2-D entropy-constrained vector quantization (ECVQ) schemes. The output indexes of the embedded quantizers are further compressed by use of noiseless entropy coding schemes, such as Huffman or arithmetic codes, resulting in variable-rate outputs. Depending upon the specific configurations of the ECVQ and the ECPVQ over the subbands, many different types of SBC schemes can be derived within the generic 2-D ECSBC framework. Among these, the authors concentrate on three representative types of 2-D ECSBC schemes and provide relative performance evaluations. They also describe an adaptive buffer instrumented version of 2-D ECSBC, called 2-D ECSBC/AEC, for use with fixed-rate channels which completely eliminates buffer overflow/underflow problems. This adaptive scheme achieves performance quite close to the corresponding ideal 2-D ECSBC system.
作者描述了一种设计方法，称为二维熵约束子带编码（ECSBC），它基于最近开发的二维熵约束矢量量化（ECVQ）方案。嵌入式量化器的输出索引进一步通过使用无噪熵编码方案（如霍夫曼或算术码）进行压缩，从而产生可变速率输出。根据子带的 ECVQ 和 ECPVQ 的具体配置，可以在通用的二维 ECSBC 框架内导出许多不同类型的 SBC 方案。在这些方案中，作者集中研究了三种有代表性的二维 ECSBC 方案，并提供了相对性能评估。他们还描述了一种用于固定速率信道的自适应缓冲区仪器化的二维 ECSBC，称为二维 ECSBC/AEC，它完全消除了缓冲区溢出/下溢问题。这种自适应方案实现的性能非常接近相应的理想二维 ECSBC 系统。
