Patent ID: 8463056

Claim:
An information processing apparatus comprising: partial decoding means for decoding a portion of a first code stream representative of coded image data into baseband image data; and encoding means for encoding the baseband image data from said partial decoding means into a second code stream having a second format converted from a first format of said first code stream, the second format and the first format corresponding to different codec formats, wherein said encoding means encodes said baseband image data using a target value for parameters with respect to said second code stream, into the second code stream having the second format, said partial decoding means determines the portion to be decoded of the first code stream, using said target value, and decodes the determined portion of the first code stream, said first code stream is generated by wavelet-transforming the baseband image data and entropy-coding wavelet transform coefficients, and said partial decoding means includes entropy decoding means for entropy-decoding said first code stream, extracting means for extracting, from said wavelet transform coefficients which are generated when said first code stream is entropy-decoded by said entropy decoding means, wavelet transform coefficients required to generate said baseband image data to be coded by said encoding means to generate said second code stream having the second format thereof, depending on said target value, and baseband data generating means for generating said baseband image data using the wavelet transform coefficients extracted by said extracting means.