NYI: Vector Quantization Codebook Processing and Organization

除了严格用于数据压缩之外，人们正在研究使用矢量量化（VQ）的新方法，并将其应用于图像处理、半色调、渐进传输和抗通信信道噪声等应用中。在许多应用中，VQ和许多图像处理操作都应用于图像的小子块。图像处理步骤可以提前应用于VQ码本中的每个矢量，处理后的矢量与码本一起存储。如果VQ编码器的计算复杂度低于图像处理步骤的计算复杂度，则可以降低计算复杂度。这种方法被应用于半色调，边缘检测和直方图均衡化。在渐进传输系统中，当比特到达时，接收到的图像被重构为传输图像的越来越好的再现。目前正在研究如何组织和订购VQ码本，使其能够用于全搜索VQ的直接累进传输。在有序VQ中，VQ码字索引与输入空间中的码字位置相关。利用具有相似索引的聚类码字的序数映射特征来获得解码器的额外复制向量。扩展了有序VQ索引在噪声通信信道上的渐进式传输。

Riskin New ways to use Vector Quantization (VQ) other than strictly for data compression are being investigated, and are being applied to applications such as image processing, halftoning, progressive transmission, and immunity against communication channel noise. In many applications, both VQ and many image processing operations are applied to small subblocks of an image. The image processing step can be applied ahead of time to each vector in a VQ codebook, with the processed vectors stored along with the codebook. If the computational complexity of the VQ encoder is lower than that of the image processing step, this reduces the computational complexity. This approach is being applied to halftoning, edge detection, and histogram equalization. In a progressive transmission system, the received image is reconstructed as an increasingly better reproduction of the transmitted image as bits arrive. Ways to organize and order a VQ codebook so that it can be used for direct progressive transmission of full search VQ are being studied. In an ordered VQ, the VQ codeword index is correlated with the codeword location in the input space. This ordinal mapping feature of clustering codewords with similar indexes to obtain additional reproduction vectors for the decoder is being exploited. Extentions to progressive transmission of ordered VQ indexes over noisy communication channels are being included.