Fundamentals of digital image processing
Fundamentals of digital image processing
A DCT-Domain Video Transcoder for Spatial Resolution Downconversion
VISUAL '02 Proceedings of the 5th International Conference on Recent Advances in Visual Information Systems
Multiplication-free approximate algorithms for compressed-domain linear operations on images
IEEE Transactions on Image Processing
DCT-based video downscaling transcoder using split and merge technique
IEEE Transactions on Image Processing
Very low bit rate video coding using H.263 coder
IEEE Transactions on Circuits and Systems for Video Technology
Fast algorithms for DCT-domain image downsampling and for inverse motion compensation
IEEE Transactions on Circuits and Systems for Video Technology
Adaptive motion-vector resampling for compressed video downscaling
IEEE Transactions on Circuits and Systems for Video Technology
Drift compensation for reduced spatial resolution transcoding
IEEE Transactions on Circuits and Systems for Video Technology
IEEE Transactions on Circuits and Systems for Video Technology
An efficient compressed domain spatial transcoding scheme for adaptive video content delivery
PCM'10 Proceedings of the Advances in multimedia information processing, and 11th Pacific Rim conference on Multimedia: Part II
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We address the topic of spatial-downscaling video transcoder in DCT-domain. The proposed techniques include the hierarchical fast motion resampling (HFMR) with accuracy motion resampling, the fast refinement for nonintegral (FRNI) motion vector (MV), and the dynamic regulating search (DRS) with low-complexity motion vector refinement. Two kinds of motion vector refinement algorithms in DRS are designed for different architectures and applications. Based on brute-forcemotion compensation in DCT-domain (MC-DCT), FRNI can provide better quality than nonrefine MV and reduce the complexity. DRS can utilize the filter for half-pixel MV in MC-DCT and it is an efficient method for extracting MC-DCT block to improve the performance further. From the experiments, the proposed algorithms can improve the entire quality and also reduce the complexity for DCT-domain video transcoder.