Patent ID: 7372600

Claim:
A communication device connectable to and communicable with a remote communication device, comprising: JPEG data retrieving means for retrieving JPEG data including encoded data and a predefined quantization table that contains a first set of numeral values arranged in an n-by-m matrix form wherein n and m are integers equal to or greater than two, the JPEG data being generated by compressing original data; recompressing means for further compressing the JPEG data retrieved by the JPEG data retrieving means, the recompressing means comprising: decoding means for decoding the encoded data and producing decoded data that contains a second set of numeral values arranged in the n-by-m matrix form; table generating means for generating a modified quantization table through multiplication of each of the numeral values in the predefined quantization table by a predetermined number, the modified quantization table containing a third set of numeral values arranged in the n-by-m matrix form; intermediate data generating means for generating intermediate data through division of each of the numeral values in the decoded data by the predetermined number, the intermediate data containing a fourth set of numeral values arranged in the n-by-m matrix form; and encoding means for encoding the intermediate data and generating new encoded data, the new encoded data and the modified quantization table being defined as recompressed JPEG data; and data transmission means for transmitting to the remote communication device selective one of the JPEG data and recompressed JPEG data.