We present a complexity-aware adaptive spatial preprocessing (pre-filtering) scheme for the efficient Region-of-Interest (ROI) Scalable videocoding (SVC). According to the proposed approach, we adaptively vary variou...
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ISBN:
(纸本)9781457713033
We present a complexity-aware adaptive spatial preprocessing (pre-filtering) scheme for the efficient Region-of-Interest (ROI) Scalable videocoding (SVC). According to the proposed approach, we adaptively vary various parameters of the SVC pre-filters, such as standard deviations, a number of filters for the dynamic pre-processing of a transition region between the ROI and background, etc., thereby enabling to dynamically adjust the desired SVC settings. In addition, our adaptive spatial pre-filtering system is based on an SVC computational complexity-rate-distortion (C-R-D) analysis, thereby adding a complexity dimension to the conventional Region-of-Interest SVC R-D analysis. As a result, the ROI SVC visual presentation quality is significantly improved, which can be especially useful for various resource-limited devices, such as mobile devices. The performance of the presented adaptive spatial ROI SVC pre-processing scheme is evaluated and tested in detail, further comparing it to the Joint Scalable video Model reference software (JSVM 9.19) and demonstrating significant improvements.
The quad-tree plus binary-tree (QTBT) partition structures was adopted into the versatile videocoding (VVC) standard. In the QTBT partition structure, a dual tree structure can be applied on intra slices where the pa...
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ISBN:
(纸本)9781728176055
The quad-tree plus binary-tree (QTBT) partition structures was adopted into the versatile videocoding (VVC) standard. In the QTBT partition structure, a dual tree structure can be applied on intra slices where the partitioning structures for luminance and chrominance components are separate. The dual tree structure is efficient for camera captured videos. However, it may be not the case for screen content videos. Therefore, adaptive dual tree structure is proposed in this paper wherein the coding structure of each coding tree unit is switched between separate and joint coding structure to adapt the textures adaptively. The proposed scheme is implemented into the reference software of the VVC standard-VTM. Simulation results report that up to 4.5% BD bitrate saving can achieve on the typical screen content videos when compared to VTM5.
This paper presents the design and implementation of a low power 8 × 8 2-D DCT chip based on a computation-effective algorithm. Computational complexity can be reduced by simplifying the direct 2-D algorithm. Thu...
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This paper presents the design and implementation of a low power 8 × 8 2-D DCT chip based on a computation-effective algorithm. Computational complexity can be reduced by simplifying the direct 2-D algorithm. Thus, the low power consumption is achieved due to complexity reduction. Besides, the parallel distributed-arithmetic (DA) technique is used to realize constant multiplication due to the low-power consideration. Additionally, the 2 V-power supply is practiced in circuit implementation for now and future battery operated applications. By using the TSMC 0.6μm single-poly double-metal technology, 133 mW power consumption at 100 MHz and the 133 MHz maximum operation speed are achieved by critical path simulation.
We present a novel efficient complexity-aware adaptive bit-rate control with dynamic Region-of-Interest pre-processing (pre-filtering) for the Scalable videocoding (SVC), which is an extension of H.264/AVC. According...
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ISBN:
(纸本)9781612843490
We present a novel efficient complexity-aware adaptive bit-rate control with dynamic Region-of-Interest pre-processing (pre-filtering) for the Scalable videocoding (SVC), which is an extension of H.264/AVC. According to the proposed approach, we adaptively vary various parameters of the SVC pre-filters, such as standard deviations and a number of filters for the dynamic pre-processing of a transition region between the ROI and background, thereby enabling to dynamically adjust the desired SVC settings. Our adaptive bit-rate control is based on an SVC computational complexity-rate-distortion (C-R-D) analysis, thereby adding a complexity dimension to the conventional Region-of-Interest SVC rate-distortion analysis. As a result, the ROI SVC visual presentation quality is significantly improved, which can be especially useful for various resource-limited devices, such as mobile devices. The performance of the presented adaptive ROI SVC preprocessing scheme is evaluated and tested in detail, further comparing it to the Joint Scalable video Model reference software (JSVM 9.19) and demonstrating significant improvements both in quality and bit-rate.
In H.264/AVC, the bits used for the Intra_4x4 prediction mode information usually occupy a high percentage in intra coding. Towards this issue, we present an efficient coding method for the Intra_4x4 prediction mode i...
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ISBN:
(纸本)9781424438273
In H.264/AVC, the bits used for the Intra_4x4 prediction mode information usually occupy a high percentage in intra coding. Towards this issue, we present an efficient coding method for the Intra_4x4 prediction mode information. Firstly, a 3-order Markov random field is introduced to model the correlation among neighboring 4x4 blocks at picture level. Secondly, based on the conditional probabilities learned in this model, we build up a context adaptive coding scheme to code the Intra_4x4 prediction mode information. Although the probabilities and the coding scheme are initialized off-line, they can be revised by automatic adjustments. Thus the proposed algorithm is robust to a variety of video sequences. Experimental results demonstrate that the proposed method can obtain a gain up to 0.3 dB in all I-frames coding without involving any serious computational burden.
Multigeneration is the repeated compression-decompression of images. Under a compression scheme like Transform coding, reconstructed images suffer further degradation at each generation, even though there is no manipu...
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ISBN:
(纸本)0819424358
Multigeneration is the repeated compression-decompression of images. Under a compression scheme like Transform coding, reconstructed images suffer further degradation at each generation, even though there is no manipulation of the image data. This paper describes multigeneration characteristics of transform coded images. We also study motion compensated coding in a multigeneration environment. We present five mechanisms that contribute to the continued degradation in multigeneration: Pixel Domain Quantization (PDQ), Pixel Domain Clipping (PDC), Compression Control Parameters Variation (CCPV), Motion Vector Re-estimation (MVR) and Error Propagation due to Motion Compensation (EPMC). For PDQ, we show that it is not the step size of the DCT domain or the pixel domain quantizers that contributes to the saturation of degradation in multigeneration, but instead the ratio between these two quantizers. We observe that PDC mainly affects the DC coefficient. In CCPV and MVR, multigeneration error is reduced when the quantization scaling parameters and/or the motion vectors of the first generation are used for each subsequent generation. For EPMC, multigeneration errors in reference pictures propagate to frames that are predicted from them. Consequently, EPMC only multiplies the effect of other mechanisms.
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