(Back to Session Schedule)

The 31st International Technical Conference on Circuits/Systems, Computers and Communications

Session T2-6  Image Coding & Analysis
Time: 13:30 - 15:30 Tuesday, July 12, 2016
Location: Room 6
Chair: Takeshi Ikenaga (Waseda University, Japan)

T2-6-1 (Time: 13:30 - 13:50)
TitlePre-processing Algorithm using Sub-band Decomposed Multiscale Retinex for Perceptual Video Coding
Author*Kwang Yeon Choi, Ho Hyeong Ryu, Byung Cheol Song (Inha University, Republic of Korea)
Pagepp. 571 - 573
Keywordpre-processing, PVC
AbstractThis paper presents a pre-processing algorithm based on sub-band decomposed multi-scale retinex (SD-MSR) for effective perceptual video coding. First, an input frame is decomposed into multiple sub-bands using SD-MSR. Then, a few high-frequency sub-bands are perceptually suppressed by controlling their gains based on a specific model. Finally, the pre-processed video sequence is encoded via a conventional video encoder. Experimental results show that the proposed algorithm can improve the coding efficiency of H.264 by about 12% on average in comparison with before-use.

T2-6-2 (Time: 13:50 - 14:10)
TitleLossless DWT Transcoder Compatible with lossy DWT for 3D Image
Author*Suvit Poomrittigul (Pathumwan Institute of Technology, Thailand), Masahiro Iwahashi (Nagaoka University of Technology, Japan)
Pagepp. 575 - 578
KeywordTranscoding, DWT, 3D image, JPEG2000, lossless-lossy
AbstractThis paper proposes the lossless discrete wavelet transform (DWT) transcoder compatible to standard lossy coding based on the 9/7 DWT in JPEG2000 (JP2K) for three dimensions (3D) image. The proposed transcoder is applied by re-lifting the integer coding 9/7 DWT and modifying the position of some coefficients. This paper has confirmed that the transcoding between the standard lossless coder 5/3 DWT and the standard lossy decoder 9/7 DWT is not compatible. Since, proposed method presents integer coding 9/7 DWT and more 2 re-lifted integer coding 9/7 DWT to improve the compatibility with standard lossy DWT. The results show that all proposed transcoders are compatible with lossy DWT for 3D image by improving from the PSNR 21.90 up to 57.0 dB.

T2-6-3 (Time: 14:10 - 14:30)
TitleMulti-view 3D CG Image Quality Assessment for Contrast Enhancement Including S-CIELAB Color Space in case the Background Region is Gray Scale
Author*Norifumi Kawabata, Masaru Miyao (Graduate School of Information Science, Nagoya University, Japan)
Pagepp. 579 - 582
KeywordMulti-view 3D Image, Double Stimulus Impairment Scale (DSIS), Luminance, S-CIELAB Color Space, CIEDE2000
AbstractIn this paper, we experimented the subjective evaluation for 3D CG image including the gray scale region with 8 viewpoints parallax barrier method, and we analyzed this result statistically. Next, we measured about the relation between the luminance change and the color difference by using S-CIELAB color space and CIEDE2000. As a result, we obtained knowledge about the relation among the coded image quality, the contrast enhancement, and gray scale.

T2-6-4 (Time: 14:30 - 14:50)
TitleUpper Coding Unit Depth Rate Distortion Cost Comparison Based Fast Intra and Interlayer Inter Prediction Mode Selection for Enhancement Layer in All Intra Spatial SHVC
Author*Pei Liu, Guojing Zhu, Gaoxing Chen, Takeshi Ikenaga (Waseda University, Japan)
Pagepp. 583 - 586
KeywordSHVC, Mode Selection, Enhancement Layer, Coding Unit Depth, Rate Distortion Cost
AbstractSHVC is the scalability extension of the video compression standard high efficiency video coding (HEVC). It encodes the video in different layers, called base layer (BL) and enhancement layer (EL). The additional interlayer inter prediction (ILIP) mode employed in EL increases the complexity. This paper proposes a fast mode selection method for EL in all intra spatial SHVC. The rate distortion cost (RD-cost) difference between intra prediction and ILIP in upper coding unit (CU) depth is calculated as a prejudgment condition to select the prediction mode in lower CU depth. The proposed method can achieve 52.65% and 58.00% encoding time saving for 1.5x and 2x sequences respectively with negligible BD-rate increase compared with SHM-8.0. Compared with related work, this paper can get over 30% time saving increase on average.