Patent ID: 7991051

Claim:
An inter-frame wavelet coding apparatus, comprising: a Motion Compensated Temporal Filtering (MCTF) unit for computing motion vectors of a group of pictures (GOP), and performing a lowpass filtering and a highpass filtering the GOP with respect to a first temporal axis using the motion vectors, in order to obtain a lowpass and a highpass filtered frames; wherein the MCTF unit performs the lowpass filtering and the highpass filtering on the lowpass filtered frame of the first temporal axis for at least one or more second temporal axis; a wavelet transforming unit for performing spatial wavelet transform on each of the highpass filtered frames and a final lowpass filtered frame and outputting wavelet coefficients of each temporal level for each of the highpass filtered frames and the final lowpass filtered frame; a quantization unit for quantizing the wavelet coefficients; an entropy coding unit for entropy-coding the motion vectors and the quantized wavelet coefficients, in order to generate an entropy-coded bit stream; and a wavelet filter managing unit for selecting a decomposition level and a filter length for the wavelet transforming unit based on motion estimation information of the GOP, which are obtained by performing the lowpass filtering and the highpass filtering the GOP in the MCTF unit; wherein the wavelet filter managing unit respectively selects the decomposition level and the filter length for each of the highpass filtered frames and the final lowpass filtered frame; wherein the decomposition level and the filter length for each of the highpass filtered frames are selected properly to the amount of information of each frame based on the motion estimation information; wherein the decomposition level and the filter length for the final lowpass filtered frame are selected a maximum decomposition level and a maximum filter length; wherein the decomposition level and the filter length are included in the entropy-coded bit stream.