Half-Pixel Correction for MPEG-2/H.264 Transcoding
To improve video quality and coding efficiency, H.264/AVC  has adopted several newer coding tools such as a 4×4 integer DCT and a method for calculating half pixels than the previous standards. However, these tools require additional work to transcode video content for pre-coded in the previous standards to H.264/AVC in the DCT domain. In this paper, we propose, as far as we know, the first half-pixel correction method for MPEG-2 to H.264 transcoding in the DCT domain. In the proposed method, an MPEG-2 block is added to the correction block obtained from the difference between half-pixel values of the two standards using a DCT reference frame. Experimental results show that the proposed method achieves better quality than the pixel based transcoding method.
KeywordsVideo Code Standard Input Block Previous Standard Correction Block Improve Video Quality
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