Block area wavelet transform picture encoding apparatus

A picture encoding apparatus comprising:

• memory means for writing and storing an input picture comprising a plurality of blocks from one line to another;
• wavelet transform means for applying wavelet transforms in the horizontal and vertical directions each time the input picture stored in the memory means reaches a predetermined number of lines required for the wavelet transforms to be applied, the wavelet transforms dividing the blocks of the input picture into a plurality of sub-bands and generating wavelet transform coefficients;
• quantization means for quantizing the wavelet transform coefficients and outputting quantization coefficients;
• and
• entropy encoding means for resolving the quantization coefficients into a plurality of bit planes resolved from most significant bit (MSB) to least significant bit (LSB) and for entropy encoding the quantization coefficients when the entropy encoding means has received a predetermined number of quantization coefficients;
• the entropy encoding means splitting and extracting fractional portions of the plurality of bit planes from the MSB to the LSB of a plurality of entropy encoding blocks existing in a same sub-band, encoding the extracted fractional portions of the bit planes from the MSB to the LSB and generating a fractional encoded bitstream corresponding to the fractional portions of the bit planes.

A picture encoding method comprising:

• storing an input picture comprising a plurality of blocks in memory means from one line to another;
• applying wavelet transforms in the horizontal and vertical directions each time the input picture stored in the memory means reaches a predetermined number of lines required for the wavelet transforms to be applied, wherein applying wavelet transforms divides the blocks of the input picture into a plurality of sub-bands and generates wavelet transform coefficients;
• quantizing the wavelet transform coefficients;
• resolving the quantization coefficients into a plurality of bit planes resolved from most significant bit (MSB) to least significant bit (LSB);
• shifting bit planes of a plurality of blocks present in a same sub-band by a pre-set number of bits to form shifted bit planes;
• and
• entropy encoding the shifted bit planes a predetermined number of quantization coefficients have been received.

A picture encoding method comprising:

• storing an input picture comprising a plurality of blocks in memory means from one line to another;
• applying wavelet transforms in the horizontal and vertical directions each time the input picture stored in the memory means reaches a predetermined number of lines required for the wavelet transforms to be applied, the wavelet transforms dividing the blocks of the input picture into a plurality of sub-bands and generating wavelet transform coefficients;
• quantizing the wavelet transform coefficients;
• and
• resolving the quantization coefficients into a plurality of bit planes resolved from the most significant bit (MSB) to the least significant bit (LSB) and entropy encoding the quantization coefficients when a predetermined number of quantization coefficients have been received;
• splitting and extracting fractional portions of the plurality of bit planes from the MSB to the LSB of a plurality of entropy encoding blocks existing in a same sub-band;
• encoding the extracted fractional portions of the bit planes from the MSB to the LSB;
• and generating a fractional encoded bitstream corresponding to said fractional portions of the bit planes.