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    • 5. 发明公开
    • 잔여계수의 상관성에 따라 변환기를 선택적으로 이용한부호화/복호화 장치 및 그 방법
    • 使用替代转换器根据残留信号的关联编码和解码的装置和方法
    • KR1020080026463A
    • 2008-03-25
    • KR1020070036089
    • 2007-04-12
    • 한국전자통신연구원광운대학교 산학협력단세종대학교산학협력단
    • 김대연임성창서정일백승권장인선장대영김재곤문경애홍진우김진웅오승준안창범정세윤최해철이영렬심동규
    • H04N19/12H04N19/625
    • H04N19/103H04N19/122H04N19/147H04N19/176H04N19/46H04N19/61
    • An apparatus for encoding and decoding by using a converter alternatively according to the correlation of residual coefficients and a method thereof are provided to select a converter with a highest compression rate by perform an RD(Rate-Distortion) cost optimization using DCT(Discrete Cosine Transform) and DST(Discrete Sine Transform) in generating a quantized conversion coefficient through converters and quantizers after prediction between images or within the images in a predetermined size of block, thereby improving the compression rate of an image block. A first converter(31-34) performs the DCT(Discrete Cosine Transform) in a block unit, first quantization, first inverse quantization and IDCT(Interger-approximated Discrete Cosine Inverse Transform) of residual coefficients which are generated after performing prediction between images or within the images. A second converter(35-38) performs the DST(Discrete Sine Transform) in the block unit, second quantization, second inverse quantization, and IDST(Interger-approximated Discrete Sine Inverse Transform) of the residual coefficients. A selection unit(39) performs RD Cost(Rate-Distortion Cost) to select a converter with a high compression rate by block, and a display unit(40) displays converter information selected by the selection unit on a corresponding flag bit in a macro block unit.
    • 提供了根据剩余系数的相关性或其方法替代地使用转换器进行编码和解码的装置,以通过使用DCT(离散余弦变换)进行RD(速率 - 失真)成本优化来选择具有最高压缩率的转换器 )和DST(离散正弦变换)中,通过转换器和量化器在预测图像之后或在预定大小的块内的图像内生成量化转换系数,从而提高图像块的压缩率。 第一转换器(31-34)以块单位进行DCT(离散余弦变换),在执行图像之间的预测之后产生的剩余系数的第一量化,第一逆量化和IDCT(Interger近似离散余弦逆变换) 在图像内。 第二转换器(35-38)以剩余系数的块单位,第二量化,第二逆量化和IDST(Interger-Neared离散正弦逆变换)执行DST(离散正弦变换)。 选择单元(39)执行RD成本(速率失真成本),以块的方式选择具有高压缩率的转换器,并且显示单元(40)将由选择单元选择的转换器信息显示在宏中的相应标志位上 块单位。