Video compression with 1-D directional transforms in H.264/AVC

Kamisli, Fatih; Lim, Jae S.

doi:10.1109/icassp.2010.5495034

Cited by 9 publications

(14 citation statements)

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“…The implementation of the selected transform remains the same as in [4], but the side information indicating which transform was selected uses fewer bits when fewer transforms are available. The 2D-DCT is always assigned a 1-bit codeword, while each available 1D-DCT is assigned a codeword of length 1 + log 2 N , where N is the number of available 1D-DCTs for the block size being processed.…”

Section: System Implementationmentioning

confidence: 99%

“…Details on 1D transform implementation, selection, and coding in the modified H.264/AVC codec can be found in [4]. The primary differences compared to the new system used in this thesis originate from the restriction of the set of available transforms.…”

Section: System Implementationmentioning

confidence: 99%

“…To select the block size for each macroblock and best transform for The experimental results from [4] show that adding the 1D-DCTs provides bitrate savings in all cases under the range of picture qualities used, which ranged from about 30dB to 40dB in PSNR. Moreover, the bitrate savings increase with picture quality.…”

Section: Direction-adaptive 1d-dctsmentioning

confidence: 99%

“…To analyze the performance of different sets of transforms in coding MC residuals, we further augment the modified H.264/AVC codec used in [4]. H.264/AVC is a modern video coding standard that is widely used in video applications, including in Blu-ray discs and streaming internet video programs.…”

Section: System Implementationmentioning

confidence: 99%

“…To exploit the characteristics of MC residuals described in the previous section, a set of directional 1D-DCTs was developed in [4] to code MC residual blocks using a modified H.264/AVC codec. These transforms apply to 8x8 and 4x4 pixel blocks, corresponding to the block sizes used in H.264/AVC.…”

Section: Direction-adaptive 1d-dctsmentioning

confidence: 99%

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Analysis of one-dimensional transforms in coding motion compensation prediction residuals for video applications

Zhang

Lim

2012

2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

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In video coding, motion compensation prediction provides significant increases in overall compression efficiency. The prediction residuals are typically treated as images and compressed by applying two-dimensional transforms such as the two-dimensional discrete cosine transform (2D-DCT). Previous work has found that the use of directionadaptive one-dimensional discrete cosine transforms (1D-DCTs) in coding motion compensation residuals can provide significant additional bitrate savings. However, this requires optimization over all of the available transforms to minimize the overall bitrate, which can be expensive in terms of time and computation.In this thesis, we examine the use of only the horizontal and vertical 1D-DCTs in addition to the 2D-DCT for coding motion compensation residuals. By reducing the number of available transforms, the amount of required computation decreases significantly, with a potential cost in performance. We perform experiments using a modified H.264/AVC codec to compare the performance of using different sets of available transforms. The results indicate that for typical applications of video coding, most of the performance benefit from using directional 1D-DCTs can be retained by keeping only the horizontal and vertical 1D-DCTs.

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Section: System Implementationmentioning

confidence: 99%

Section: System Implementationmentioning

confidence: 99%

Section: Direction-adaptive 1d-dctsmentioning

confidence: 99%

Section: System Implementationmentioning

confidence: 99%

Section: Direction-adaptive 1d-dctsmentioning

confidence: 99%

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