Abstract: A method of compressing digital data comprising the steps of: (i) reading digital data as series of binary coded words representing a context and a codeword to be compressed; (ii) calculating distribution output data for the input data and assigning variable length codewords to the result; and (iii) periodically recalculating the codewords in accordance with a predetermined schedule, in order to continuously update the codewords and their lengths.

Abstract: A method of compressing digital data comprising the steps of: (i) reading digital data as series of binary coded words representing a context and a codeword to be compressed; (ii) calculating distribution output data for the input data and assigning variable length codewords to the result; and (iii) periodically recalculating the codewords in accordance with a predetermined schedule, in order to continuously update the codewords and their lengths.

Abstract: A method of compressing digital data includes the steps of (i) reading digital data as a series of binary coded words representing a context and a code word to be compressed, (ii) calculating distribution output data from the input data and assigning variable length code words to the result; and (iii) periodically recalculating the code words in accordance with a predetermined schedule, in order to continuously update the code words and their lengths.

Abstract: A method of receiving video data comprising the steps of: receiving at least one chunk of video data comprising a number of sequential key video frames where the number is at least two and, constructing at least one delta frame between a nearest preceding key frame and a nearest subsequent key frame from data contained in the either or each of the nearest preceding and subsequent frames.

Abstract: A method of facilitating navigation of a sequence of source images the method using tokens representing each source image which are scaled versions of each source image and which are arranged adjacently on a display device in a continuous band of token images so that a pointer device can point to a token and the identity of the corresponding image is available for further processing.

Abstract: A method of receiving video data comprising the steps of: receiving at least one chunk of video data comprising a number of sequential key video frames where the number is at least two and, constructing at least one delta frame between a nearest preceding key frame and a nearest subsequent key frame from data contained in the either or each of the nearest preceding and subsequent frames.

Abstract: A method of facilitating navigation of a sequence of source images the method using tokens representing each source image which are scaled versions of each source image and which are arranged adjacently on a display device in a continuous band of token images so that a pointer device can point to a token and the identity of the corresponding image is available for further processing.

Abstract: Digital data representing individual pixels of a video image frame are read and then encoded as a series of binary coded words describing blocks of pixels typically eight by eight for transmission or storage. When the words are decoded an assessment is made as to when a set of pixels representing a region of the video image frame signifying an object at least overlaps into other blocks. Subregions of the blocks in question which make up the whole region are identified and their pixel luminance and chrominance values and these values are interpolated across the region to smooth out transitions across boundaries artificially delimiting the subregions. A library of masks representing luminance values for all the pixels in a block can be made available in order to enhance the compression process.