Efficient deblocking and optimal quantizer selection for video transcoding

In bit rate reduction video transcoding, blockness in the transcoded result can become a major problem. Previous works have shown that deblocking can be achieved by recomputing some of the DCT coefficients. However, in video transcoding, these DCT coefficients are subject to a requantization process, which may render the deblocking ineffective. We propose to consider deblocking in conjunction with the requantization process therefore accelerating the transcoding processes. In addition, the method also motivates a design of an optimized quantizer selection algorithm that boosts the deblocking capability of the video transcoder.