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    • 1. 发明授权
    • Regularized dequantizer for DCT-based transform coding
    • 用于基于DCT的变换编码的正则化去量化器
    • US06853683B2
    • 2005-02-08
    • US09812330
    • 2001-03-19
    • Samuel Moon-Ho SongGunho Lee
    • Samuel Moon-Ho SongGunho Lee
    • H04N7/24G06T9/00H04N7/26H04N7/30H04N7/12
    • H04N19/86H04N19/126H04N19/60
    • A new dequantization scheme for DCT-based transform coding, such as JPEG, MPEG and H.26x, is disclosed. The new approach drastically reduces blocking artifacts without smoothing the decoded image. Most discrete cosine transform (DCT) based video coding suffers from blocking artifacts where boundaries of 8×8 DCT blocks become visible on decoded images. The blocking artifacts become more prominent as the bit rate is lowered. In the present invention, a new dequantization technique is disclosed for discrete cosine transform (DCT) based encoding to sharply reduce the blocking artifacts. The dequantization scheme of the present invention sharply reduces blocking artifacts in decoded images through regularization. The performance comparison with the standard JPEG as well as MPEG and H.26x decoding shows visual improvements as well as numerical improvements in terms of the peak-signal-to-noise ratio (PSNR) and the blockiness measure (BM) to be defined.
    • 公开了一种用于基于DCT的变换编码的新的量化方案,例如JPEG,MPEG和H.26x。 新的方法大大减少了块状伪影,而不使解码图像平滑。 大多数基于离散余弦变换(DCT)的视频编码都遭遇到块伪影,其中8x8 DCT块的边界在解码图像上变得可见。 当比特率降低时,块伪影变得更加突出。 在本发明中,公开了一种用于基于离散余弦变换(DCT)的编码的新的去量化技术,以便大大减少块伪影。 本发明的逆量化方案通过正规化大大减少了解码图像中的块伪影。 与标准JPEG以及MPEG和H.26x解码器的性能比较显示了视频改进以及峰值信噪比(PSNR)和待定义的阻塞测量(BM)方面的数值改进。