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A multiplication-free digital architecture for 16#x00D7;16 2-D DCT/DST transform for HEVC

机译:HEVC的16×16 2-D DCT / DST转换的无乘法数字架构

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The discrete cosine transform (DCT) is widely employed in image and video coding applications due to its high energy compaction. In addition to 4×4 and 8×8 transforms utilized in earlier video coding standards, the proposed HEVC standard suggests the use of larger transform sizes including 16 × 16 and 32×32 transforms in order to obtain higher coding gains. Further, it also proposes the use of non-square transform sizes as well as the use of the discrete sine transform (DST) in certain intra-prediction modes. The decision on the type of transform used in a given prediction scenario is dynamically made, to obtain required compression rates. This motivated the proposed digital VLSI architecture for a multitransform engine capable of computing 16×16 approximate 2-D DCT/DST transform, with null multiplicative complexity. The relationship between DCT-II and DST-II is employed to compute both transforms using the same digital core, leading to reductions in both area and power. Closed-form relationship between the 16×16 transform and arbitrary smaller sized transform is presented, enabling the usability of this architecture to compute transforms of size 4 · 2P × 4 · 2q where 0 ≤ p, q ≤ 2.
机译:离散余弦变换(DCT)由于其高能量压缩而广泛用于图像和视频编码应用。除了在较早的视频编码标准中使用的4×4和8×8变换之外,提出的HEVC标准还建议使用更大的变换大小,包括16×16和32×32变换,以获得更高的编码增益。此外,还提出了在某些帧内预测模式下使用非正方形变换大小以及使用离散正弦变换(DST)。动态地确定在给定预测方案中使用的变换类型,以获取所需的压缩率。这激发了所提出的用于多变换引擎的数字VLSI体系结构,该引擎能够计算16×16近似2-D DCT / DST变换,且乘法乘积为零。 DCT-II和DST-II之间的关系用于使用同一数字核来计算两个转换,从而减小了面积和功耗。提出了16×16变换与任意较小尺寸的变换之间的闭式关系,从而使该体系结构可用于计算大小为4·2 P ×4·2 q 其中0≤p,q≤2。

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