Compressed quantized image-data transmission technique suitable for use in teleconferencing
Coding transmission equipment for carrying out coding with adaptive quantization
Television transmission system including a pyramidal coding/decoding circuit
Progressive transmission of high resolution two-tone facsimile images
Edge decomposition for the transmission of high resolution facsimile images Patent #: 4873577
AbstractA system for reducing image data redundancies through progressive sub-band coding. The image is separated into a selected plurality of sub-bands, and the sub-band with the largest non-redundant data content is chosen and used to predict the data in the other sub-bands. Only prediction error information of the predicted sub-bands encoded and transmitted together with the encoded chosen sub-band. An overall performance error signal can also be evaluated at the encoder's end and used to further improve performance. The sub-band encoding can be performed recursively to still further reduce the encoded data.