screencontent video applications require efficient coding of computer-generated materials. The new screen content coding tools such as intra block copy (IBC) and palette mode (PLT) have addressed this requirement. Ho...
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ISBN:
(纸本)9781728180687
screencontent video applications require efficient coding of computer-generated materials. The new screen content coding tools such as intra block copy (IBC) and palette mode (PLT) have addressed this requirement. However, the added computational complexity on top of the existing sophisticated video encoders is also challenging. In this paper, we focus on the fast and efficient encoder implementation of these screen content coding tools. Improvements on hash-based IBC search, PLT optimization, mode decision between PLT and intra mode, and other general encoder accelerations towards screencontent applications are studied and discussed. Experimental results show that with these methods added, the encoder can achieve some faster runtime performance than before while the compression efficiency is almost doubled with screen content coding tools.
This paper reports on verification testing of the coding performance of the screen content coding (SCC) extensions of the High Efficiency Video coding (HEVC) standard (Rec. ITU-T H.265 vertical bar ISO/IEC 23008-2 MPE...
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ISBN:
(数字)9781510612501
ISBN:
(纸本)9781510612501;9781510612495
This paper reports on verification testing of the coding performance of the screen content coding (SCC) extensions of the High Efficiency Video coding (HEVC) standard (Rec. ITU-T H.265 vertical bar ISO/IEC 23008-2 MPEG-H Part 2). The coding performance of HEVC screencontent model (SCM) reference software is compared with that of the HEVC test model (HM) without the SCC extensions, as well as with the Advanced Video coding (AVC) joint model (JM) reference software, for both lossy and mathematically lossless compression using All-Intra (AI), Random Access (RA), and Low-delay B (LB) encoding structures and using similar encoding techniques. Video test sequences in 1920x1080 RGB 4:4:4, YCbCr 4:4:4, and YCbCr 4:2:0 colour sampling formats with 8 bits per sample are tested in two categories: "text and graphics with motion" (TGM) and "mixed" content. For lossless coding, the encodings are evaluated in terms of relative bit-rate savings. For lossy compression, subjective testing was conducted at 4 quality levels for each coding case, and the test results are presented through mean opinion score (MOS) curves. The relative coding performance is also evaluated in terms of Bjontegaard-delta (BD) bit-rate savings for equal PSNR quality. The perceptual tests and objective metric measurements show a very substantial benefit in coding efficiency for the SCC extensions, and provided consistent results with a high degree of confidence. For TGM video, the estimated bit-rate savings ranged from 60-90% relative to the JM and 40-80% relative to the HM, depending on the AI/RA/LB configuration category and colour sampling format.
In recent years, screencontent video is becoming increasingly popular in several major video applications, such as video recording and video conferencing. Due to the unique features of screencontent videos that are ...
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ISBN:
(纸本)9781665492577
In recent years, screencontent video is becoming increasingly popular in several major video applications, such as video recording and video conferencing. Due to the unique features of screencontent videos that are not captured by camera sensors but produced artificially, dedicated coding tools have been developed for achieving significant compression efficiency gain. In recognition of the popularity of screencontent applications, an open video dataset for screencontent is proposed in this paper for the development of screen content coding technologies. The proposed video dataset consists of 12 typical screencontent type video clips that are publicly available. In addition, to better understand the characteristics of the proposed video dataset, several major screen content coding tools in AOMedia Video 1 (AV1) have been evaluated on this dataset and analyzed in this paper.
This paper presents a novel two-layer coding framework targeting visually loss less compression of screencontent video. The proposed framework employs the conventional HEVC standard for the base-layer. For the enhanc...
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ISBN:
(纸本)9781479902880
This paper presents a novel two-layer coding framework targeting visually loss less compression of screencontent video. The proposed framework employs the conventional HEVC standard for the base-layer. For the enhancement layer, a hybrid of spatial and temporal block-prediction mechanism is introduced to guarantee a small energy of the error-residual. Spatial prediction is generally chosen for dynamic areas, while temporal predictions yield better prediction for static areas in a video frame. The prediction residual is quantized based on whether a given block is static or dynamic. Run-length coding, Golomb based binarization and context-based arithmetic coding are employed to efficiently code the quantized residual and form the enhancement-layer. Performance evaluations using 4: 4: 4 screencontent sequences show that, for visually lossless video quality, the proposed system significantly saves the bit-rate compared to the two-layer lossless HEVC framework.
screen content coding (SCC) extension to High Efficiency Video coding (HEVC) offers substantial compression efficiency over the existing HEVC standard for computer generated content. However, this gain in compression ...
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ISBN:
(纸本)9781509048250
screen content coding (SCC) extension to High Efficiency Video coding (HEVC) offers substantial compression efficiency over the existing HEVC standard for computer generated content. However, this gain in compression efficiency is achieved at the expense of further computational complexity with several resource hungry coding tools. Hence, extension of SCC to HEVC hardware encoders can be challenging. This paper presents resource efficient hardware designs for two key SCC tools, Intra Block Copy and Palette coding. Moreover, a new hash search approach is proposed for Intra Block Copy, while a hardware friendly palette indices coding scheme is suggested for Palette coding. These designs are targeted to achieve the throughput necessary for an 1080p 30 frames/s encoder, and incurs coding loss of 11.4% and 5.1% respectively in all intra configurations. The designs are synthesized for a Virtex-7 VC707 evaluation platform.
Intra Block Copy (IBC) and Intra Template Matching Prediction (IntraTMP) are two efficient algorithms to sufficiently exploit the correlation in the same picture. Block Vector (BV) is used to represent the displacemen...
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ISBN:
(纸本)9798350344868;9798350344851
Intra Block Copy (IBC) and Intra Template Matching Prediction (IntraTMP) are two efficient algorithms to sufficiently exploit the correlation in the same picture. Block Vector (BV) is used to represent the displacement between the current block and its reference within the same picture. The BV information of luma can be employed to help the chroma coding efficiently. Based on this feature, an adaptive chroma prediction is proposed to derive the BV of the chroma block from the luma. Two strategies are designed to improve the coding performance, including multiple positions' check and template-based BV refinement. Compared with Enhanced Compression Model (ECM) of beyond VVC, 0.43%, 0.35%, and 0.60% BD-rate savings for Y, Cb, and Cr components are achieved for Class F, and 2.23%, 2.31%, and 2.93% BD-rate savings are provided for Class TGM. We also integrated the proposed method into the VVC Test Model (VTM). A similar coding improvement can be observed. Due to the coding gain and low complexity, the proposed method has been adopted into the beyond VVC exploration and integrated into the latest version of ECM.
This paper proposes an IBC-Mirror mode for screen content coding (SCC) for the next generation video coding standards, including Versatile Video coding (VVC) and Audio Video Standard-3 in China (AVS3). It is the first...
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ISBN:
(纸本)9781728180687
This paper proposes an IBC-Mirror mode for screen content coding (SCC) for the next generation video coding standards, including Versatile Video coding (VVC) and Audio Video Standard-3 in China (AVS3). It is the first time to take mirror characteristic into consideration for SCC in VVC/AVS3. Based on the translational motion model of Intra Block Copy (IBC) mode, the function of "horizontal and vertical flipping" is further added to reduce prediction error and improve coding efficiency. The proposed IBC-Mirror mode is implemented on the latest reference software, including VTM-5.0 (VVC) and HPM-5.0 (AVS3). The simulations show that the proposed mode can achieve up to 1 similar to 2% (VVC) and 4 similar to 7% (AVS3) BD-rate saving for SCC test sequences. Drafts about the mode have been submitted to AVS meeting and investigated in SCC Core Experiments (CE).
screencontent has different characteristics compared with natural content captured by cameras. To achieve more efficient compression, some new coding tools have been developed in the High Efficiency Video coding (HEV...
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ISBN:
(纸本)9781509021758
screencontent has different characteristics compared with natural content captured by cameras. To achieve more efficient compression, some new coding tools have been developed in the High Efficiency Video coding (HEVC) screen content coding (SCC) Extension, which also increase the computational complexity of encoder. In this paper, complexity analysis are first conducted to explore the distribution of complexities. Then, two classification trees, including early coding units (CU) partition tree (EPT) and CU content classification tree (CCT), are designed based on statistical characteristics and coding information. EPT is used to decide whether the CU skip the mode decision process of current depth level and CCT is used to classify the blocks into either natural blocks or screen blocks. Natural blocks will skip screencoding modes and screen blocks skip normal intra modes. Experimental results show the proposed algorithm can save 49% encoding time with 2.7% BD-rate increase on average for All Intra configuration under the SCC common test condition.
This paper presents an in-loop adaptive color-space transform for the HEVC screen content coding extension. In the proposed method, the prediction residual is adaptively converted into a different color space to reduc...
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ISBN:
(纸本)9781479984305
This paper presents an in-loop adaptive color-space transform for the HEVC screen content coding extension. In the proposed method, the prediction residual is adaptively converted into a different color space to reduce the cross-component redundancy. After the ACT, the signal is coded following the existing HEVC framework. To keep the complexity as low as possible, fixed color-space transforms that are easily implemented with shift and add operations are utilized. Significant coding gains are achieved by this method in the current HEVC screen content coding reference software with no increase of decoding runtime. The proposed method has been adopted to the HEVC screen content coding extension.
The paper presents application of the emerging HEVC screen content coding for frame-compatible compression of stereoscopic video. Such a solution may be an alternative to the Multiview HEVC, which is the state-of-the-...
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ISBN:
(纸本)9781509063444
The paper presents application of the emerging HEVC screen content coding for frame-compatible compression of stereoscopic video. Such a solution may be an alternative to the Multiview HEVC, which is the state-of-the-art dedicated technique for multiview video compression. The paper provides an extensive description of main differences between both compression techniques. Authors also present adaptation of the screen content coding to compress stereoscopic video as fast and efficiently as possible. The paper reports experimental results of the comparison between HEVC screen content coding and Main profiles for frame-compatible compression of stereoscopic video. The advantages and disadvantages of the proposed technique are enumerated in the conclusions.
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