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Video image compression using a hierarchical vector quantification of weighted wavelengths
Video image compression using a hierarchical vector quantification of weighted wavelengths
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机译:使用加权波长的分层矢量量化进行视频图像压缩
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摘要
A weighted wavelet hierarchical vector quantization (WWHVQ) procedure is initiated by obtaining (12) an N x N pixel image where 8 bits per pixel. A look-up operation (14) is performed to obtain data representing a discrete wavelet transform (DWT) followed by a quantization of the data. Upon completion of the look-up, a data compression will have been performed. Further stages and look-up will result in further compression of the data, i.e., 4:1, 8:1, 16:1, 32:1, 64:1,...etc. Accordingly, a determination (16) is made whether the compression is complete. If the compression is incomplete, further look-up is performed. If the compression is complete, however, the compressed data is transmitted (18). Optionally, it is determined (19) at a gateway whether further compression is required. If so, transcoding is performed (20). The receiver receives (22) the compressed data. Subsequently, a second look-up operation (24) is performed to obtain data representing an inverse discrete wavelet transform of the decompressed data. After one iteration,the data is decompressed by a factor of two. Further iterations allows for further decompression of the data. Accordingly, a determination (26) is made whether decompression is complete. If the decompression is in incomplete, further look-ups are performed, elsethe procedure is ended. MATH
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机译:通过获得(12)每像素8位的N x N像素图像来启动加权小波分层向量量化(WWHVQ)过程。执行查找操作(14)以获得表示离散小波变换(DWT)的数据,然后对数据进行量化。查找完成后,将执行数据压缩。进一步的阶段和查找将导致数据的进一步压缩,即4:1、8:1、16:1、32:1、64:1等。因此,确定(16)压缩是否完成。如果压缩不完全,则执行进一步查找。但是,如果压缩完成,则发送压缩数据(18)。可选地,在网关处确定(19)是否需要进一步压缩。如果是这样,则执行代码转换(20)。接收器接收(22)压缩数据。随后,执行第二查找操作(24)以获得表示解压缩的数据的逆离散小波变换的数据。一次迭代后,数据将解压缩两倍。进一步的迭代允许进一步解压缩数据。因此,确定(26)减压是否完成。如果减压不完全,则执行进一步的查找,否则过程结束。 展开▼