Patent ID: 6529551
Filing Date: 2003-03-04
Classification: H04N

Abstract:
A method for recompressing image representative input pixel block data comprising a fixed first number of data bits to provide recompressed pixel block data of a target fixed reduced second number of bits less than said first number, the steps comprising:providing a hybrid quantization coding table including, (a) a first codeword set comprising a plurality of codewords of a first fixed bit length representing a corresponding plurality of data quantization intervals of said coding table, (b) a second codeword set including a codeword of a second fixed length shorter than said first length representing a data quantization interval of said coding table; dynamically selecting between codewords of said first and second codeword sets in quantizing an input pixel block to provide a recompressed pixel block of said target fixed reduced second number of bits; and assigning said selected codewords to data elements of said input pixel block to provide a corresponding recompressed pixel block containing said fixed reduced second number of bits.