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反离散余弦变换是MPEG-2中恢复帧内编码系数或差分系数的重要手段。3设计了用于MPEG-2MP@ML视频解码VLSI的IDCT电路结构,采用了VHDL进行描述并通过模拟和验证。这里采用了全硬件实现的方法,并针对性地提出相应的硬件电路结构设计,减少了电路规模以适应MPEG-2MP@ML视频量大,处理复杂的特点,达到实进解码的目的。 相似文献
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实时MPEG-2解码器当阅读此文时,一种新的、称为Videomax(视频之最)(CL9100)的单片(160脚QFP)、实时MPEG-2视频解码器将在NAB(美全国广播工作者协会)亮相。除MPEG-1和MPEG-Z视频解码(非要求的主解码)外,它为用... 相似文献
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MPEG-4是一个正在制定的编码标准,除了具有MPEG-1和MPEG-2标准的基于“帧”的功能以外,MPEG-4视频编码算法还支持多媒体环境中对视频景物内的“物体”进行存取与操纵。概述了MPEG-4视频编码标准将支持的新功能,并描述了第4版MPEG-4视频验证模型的结构。 相似文献
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设计了用于MPEG-2MP@ML视频解码VLSI的IQ电路结构,基于对IQ的运算字长和精度关系的分析,有针对性地提出相应的硬件电路结构设计,减少了电路规模以适应MPEG-2MP@ML视频较大的数据量,电路采用了VHDL进行描述并通过模拟和验证。结果表明该电路可以完成MPEG-2解码的功能。 相似文献
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MPEG-4是一个正在制定的编码标准,除了具有MPEG-1和MPEG-2标准的基于“帧”的功能以外,MPEG-4视频编码算法还支持多媒体环境中对视频景物内的“物体”进行存取与操纵。文中描述了第四版MPEG-4视频验证模型的结构及其提供的主要编码工具和算法。 相似文献
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本文提出了一种码率不高于22Mb/s的基于MPEG-2标准的数字高清晰度电视视频编解码实验系统,重点研究了帧/场自适应DCT变换及相应的帧/场扫描方式、量化器设计、码率控制及缓存器控制策略、数据流层结构等关键技术。 相似文献
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本文简要分析了HDTV接收系统中视频解码的特点与实现方法,介绍了一种HDTV视频解码器的硬件结构及其工作过程。重点讨论了该视频解码器的软件系统结构,主要模块的设计与实现。该视频解码器可对符合MPEG-2 MP@HL的视频流进行解码并兼容多种视频格式的输出。 相似文献
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本文分析了理想的MPEG-2信源解码器中视频、音频同步实现的关键,给出了实际的解码器中实现视频、音频同步会遇到的问题和解决的方法。实践证明,这些方法是有效的,已用于我们的MPEG-2信源解码器中。 相似文献
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Nam Ling Nien-Tsu Wang 《Broadcasting, IEEE Transactions on》2002,48(4):353-360
We present a scheme for real-time digital HDTV video decoding suitable for DVB or ATSC set-top boxes. Our technique is based on a dual decoding datapath controlled in two fixed-scheduling combinations with an efficient memory interface scheme for anchor pictures. Unlike other decoding approaches such as the slice bar decoding method and the crossing-divided method, our scheme reduces memory access contention problem to achieve real-time HDTV decoding without a high cost in overall decoder buffers, architecture, and bus. Our simulation shows that with a relatively low rate 81 MHz clock, our decoder can decode MPEG-2 MP@HL HDTV in real-time, based on a video format of 1920 /spl times/ 1080 pixels/frame at 30 frames/s, at a bit rate of 18-22 Mbps. 相似文献
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In this paper, an architecture for real-time digital HDTV video decoding is presented. Our architecture is based on a dual decoding datapath controlled in a fixed schedule with an efficient write-back scheme for anchor pictures. The decoding datapath is synchronized at the block (8 × 8 pixels) level. Unlike other decoding approaches such as the slice bar decoding method and the cross-divide method, our scheme reduces memory access contention problem to achieve real-time HDTV decoding without a high cost in overall decoder buffers, architecture, and bus. In comparison to data-flow approaches, our method eliminates the complexity associated with tagged data operations. Our anchor picture storage is organized to minimize page-breaks during memory accesses. Simulation shows that with a relatively low rate 81 MHz clock, our decoder can decode MPEG-2 MP@HL HDTV in real-time, based on an ATSC video format of 1,920 × 1,080 pixels/frame at 30 frames/s, at a bit rate of 18 to 20 Mbps. 相似文献
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Multirate 3-D subband coding of video 总被引:19,自引:0,他引:19
We propose a full color video compression strategy, based on 3-D subband coding with camera pan compensation, to generate a single embedded bit stream supporting multiple decoder display formats and a wide, finely gradated range of bit rates. An experimental implementation of our algorithm produces a single bit stream, from which suitable subsets are extracted to be compatible with many decoder frame sizes and frame rates and to satisfy transmission bandwidth constraints ranging from several tens of kilobits per second to several megabits per second. Reconstructed video quality from any of these bit stream subsets is often found to exceed that obtained from an MPEG-1 implementation, operated with equivalent bit rate constraints, in both perceptual quality and mean squared error. In addition, when restricted to 2-D, the algorithm produces some of the best results available in still image compression. 相似文献
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在传统的CBR码流控制中,为防止缓冲器上溢,通常采用跳帧的方法来保持码率恒定。由于跳帧引起解码端运动补偿误差增大,客观上造成跳帧期间图像PSNR降低,图像失真度迅速增加,在主观上造成图像有跳跃感,画面不流畅。针对以上缺陷,该文基于H.263+的TMN8帧级码流控制算法,提出了一种空域可分级的自适应码流控制方法。该方法在编码端对原跳帧方法中不编码的帧进行自适应下采样编码,解码端通过上采样恢复。实验结果证明,该文提出的码流控制算法在低带宽条件下,图像质量较跳帧方法有较大提高。在低码率条件下,对于高运动图像该方法的平均PSNR值比采用跳帧的码流控制方法高0.3~0.8dB;比采用增大量化步长的方法高0.1~0.4dB,而对于跳帧阶段PSNR值,该算法比传统的跳帧方法高1~2dB左右。 相似文献
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