Patent ID: 7480418

Claim:
A method of processing a digital image, said method comprising: providing the digital image in a compressed format, wherein the digital image is represented as a bitstream representing sequential image blocks, each block comprising one or more components, each component comprising one or more data units and each data unit being represented as a Huffman-coded stream of coefficients of basis functions, wherein a zeroth order coefficient is represented as a difference to the previous zeroth order coefficient of the corresponding component, and a block information table comprising: indicators to one zeroth order or first order coefficient of each image block in the bitstream, information indicating the number of bits in the bitstream between coefficients of zeroth or first order in adjacent data units of the image block, and the zeroth order coefficient of at least one data unit of each component, said zeroth order coefficient being represented in a non-differential form, and for each data unit of at least one image block: accessing the zeroth order coefficient of the data unit and Huffman-decoding none or a predetermined number of coefficients of the data unit, skipping the rest of the coefficients by jumping to the next zeroth or first order coefficient in the bitstream using the information in the block information table regarding the number of bits between coefficients in adjacent data units in the bitstream, whereby a reduced set of Huffman-coded coefficients are decoded.