公开(公告)号：US5838825A

公开(公告)日：1998-11-17

申请号：US784709

申请日：1997-01-16

申请人： Yoshimasa Obayashi ,  Katsuyuki Kaneko ,  Yoshiteru Mino ,  Sadafumi Tomida

发明人： Yoshimasa Obayashi ,  Katsuyuki Kaneko ,  Yoshiteru Mino ,  Sadafumi Tomida

IPC分类号： G06T9/00 ,  G06K9/36 ,  G06K9/46

CPC分类号： G06T9/007

摘要： One block of non-zero coefficients obtained through the decoding of the entropy decoding unit 2024 is stored in the coefficient storage unit 121 in accordance with positional coordinates calculated by the non-zero coefficient scanning order calculation unit 2023a and the non-zero coefficient position conversion unit 2023b. The stored non-zero coefficients are then inverse quantized by the inverse quantization unit 2022. The non-zero coefficient range calculation unit 122 specifies a region of the coefficient storage unit 121 in which the non-zero coefficients are stored. The calculation order control unit 123 controls the inverse DCT unit 2021 to only perform an inverse DCT (discrete cosine transform) for non-zero coefficients located in the specified region.

摘要翻译： 通过熵解码单元2024的解码获得的一个非零系数块根据由非零系数扫描顺序计算单元2023a计算的位置坐标和非零系数位置转换而被存储在系数存储单元121中 单位2023b。 存储的非零系数然后由逆量化单元2022进行逆量化。非零系数范围计算单元122指定存储非零系数的系数存储单元121的区域。 计算顺序控制单元123控制逆DCT单元2021仅对位于指定区域中的非零系数执行逆DCT（离散余弦变换）。