Patent ID: 6167153
Filing Date: 2000-12-26
Classification: H04N

Abstract:
A method of improving the speed and efficiency of ADCT electronic data compression, comprising:a) obtaining input image data which includes discrete values representing light intensity in an image;b) generating approximation data which provides an estimated value of said image light intensity represented in said input image data, including:i) segmenting said input image data to form a plurality of image data blocks;ii) partitioning said image data block into a plurality of image data sub-blocks, each representing a plurality of pixel; andiii) representing each image data sub-block as a single value in an approximation data block for said plurality of pixels;c) from said approximation data, generating a compressed image data file, including:i) transforming said approximation data into a block of ADCT coefficients;ii) quantizing said coefficient block;iii) arranging said quantized coefficient block into a one dimensional vector; andiv) encoding said one dimensional vector into a bit stream, to produce said output image data; andd) transmitting said output image data, derived from said approximation data, via a communication medium to a receiving device.