Variable block size transforms with higher order kernels for ultra-high definition video coding

Lee, Bumshik; Ahn, Sangsoo; Kim, Munchurl; Kim, Hui Yong; Kim, Jong-Ho; Jeong, Se Yoon

doi:10.1117/12.840228

Cited by 3 publications

(4 citation statements)

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“…Owing to the limitation of length in the paper, details for quantisation and normalisation using transform kernels are not included in this paper. The quantisation and normalisation processes of order‐16 kernels are described in detail in [5].…”

Section: Hvbt With An Order‐16 Ict Kernelmentioning

confidence: 99%

“…Studies with higher-order ICT for higher resolution video coding were conducted in [2][3][4][5]. Dong et al [2] proposed a 16 × 16 ICT kernel by expanding an 8 × 8 ICT transform.…”

Section: Introductionmentioning

confidence: 99%

“…Studies with higher‐order ICT for higher resolution video coding were conducted in [2–5]. Dong et al .…”

Section: Introductionmentioning

confidence: 99%

“…Although it can be simply implemented using a lower‐order ICT kernel, orthogonality of the kernel is not retained and the approximation error is high. The higher‐order kernels for high‐resolution video were proposed with notable coding gains in our previous work [5]. However, single types of ICT are used in [5] for each 16 × 16 MB, which limits coding efficiency improvement in the image regions with complex texture and motion.…”

Section: Introductionmentioning

confidence: 99%

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Performance analysis of hierarchical transform coding with a large kernel for video codecs

Lee

Kim

et al. 2014

IET Image Processing

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In this study, the performance of hierarchical transform coding is analysed with design of an order-16 integer transform kernel. The proposed hierarchical transform-coding structure is constructed with a set of 4 × 4, 8 × 8 and 16 × 16 integer transforms of variable transform block sizes, which takes the advantages of both lower and higher transform kernels by flexibly adapting to varying image characteristics of video sequences with homogeneous and complex regions. The proposed hierarchical transform-coding structure is implemented as an extension to H.264/advanced video coding joint model. The authors show the effectiveness of the hierarchical variable-sized block transform scheme by analysing the quantisation effects and the correlation among neighbouring pixels in video sequences of different spatial resolutions. The experimental results show that: (i) the variable-sized block transform scheme with the hierarchical structure is advantageous to the texture regions with strong local edges and (ii) the higher-order-16 integer transform kernel itself is more effective for the homogeneous texture regions, which are often encountered in higher resolution sequences. Therefore these two features can complementarily work in an rate-distortion (RD) optimised manner for various characteristics of the input signals.

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Section: Hvbt With An Order‐16 Ict Kernelmentioning

confidence: 99%

“…Studies with higher-order ICT for higher resolution video coding were conducted in [2][3][4][5]. Dong et al [2] proposed a 16 × 16 ICT kernel by expanding an 8 × 8 ICT transform.…”

Section: Introductionmentioning

confidence: 99%

“…Studies with higher‐order ICT for higher resolution video coding were conducted in [2–5]. Dong et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations