共查询到19条相似文献,搜索用时 78 毫秒
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主要探讨了图像信息压缩技术的基本途径和研究动向,以及图像编码国际标准化动向,并对未来图像编码的前景进行了展望,提出了利用图像几何结构特点用于图像编码以及软件编码、多媒体融合编码的新观点。 相似文献
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本文简要回顾了图像通信和图像压缩编码的历程,说明了图像编码的重要性和目前实用中的图像编码技术水平,重点介绍了常用的图像编码方法和有关国际标准,并对研究中的一些新的图像编码方法作了扼要介绍。 相似文献
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立体视频图像编码的研究进展 总被引:1,自引:1,他引:0
从编码方案、关键技术和评价准则3个方面综述了立体视频图像编码研究的发展.阐明了各种编码方案的特点及适用范围.详细分析了立体视频图像编码中视差估计、运动估计、遮挡检测、残差图像编码和码率控制5大关键技术,总结了各项技术的发展现状.最后指出了立体视频图像编码研究中存在的问题,并对未来的研究方向进行了展望. 相似文献
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分析与综合小波交换使用时编码性能的研究 总被引:1,自引:0,他引:1
本文提出了一种新的选择适于图像编码应用的双正交小波基的方法。通过用几个已被证实是与图像编码密切相关的小波基评价标准,对双正交小波中分析与综合函数交换使用时的编码性能进行全面的比较研究,选出了适合图像编码的分析或综合小波基,并作了编码实验检验。 相似文献
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本文主要对ATM体系中的语音编码方式和图像编码方式进行研究,提出了一些新的概念和编码算法,并得出有一定参考价值的结果。 相似文献
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近年来,已经制定和正在制定一系列的图像编码国际标准。本文扼要介绍CCITT、ISO/IEC等组织在图像编码标准化方面的活动以及JPEG、Rec.H.261、MPEG等几个静止图像编码和活动图像编码标准的技术特点。 相似文献
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适应于极低传输码率的物体基图像编码 总被引:1,自引:0,他引:1
本文介绍了物体基编码的基本方法、算法流 程及其关键技术。该编码方法的重要特点是既考虑到所处理对象的一般性,又利用了一定的先验知识,因此可用于极低传输速度的图像编码,是电视电话中的一种很有应用前景的编码方法。 相似文献
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分析了数字图像信号压缩编码技术的分类以及图像质量与压缩编码技术的关系,对数字图像信号失真的基本因素进行分类,详细介绍压缩编码处理对图像信号质量的影响,说明针对数字图像信号进行主、客观评价及其测试的方法。 相似文献
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The run-length coding and the morphological representation are two classical schemes for wavelet image coding. The run-length
coders have the advantage of simplicity by recording the lengths of zero-runs between significant wavelet coefficients but
at the expense of yielding an inferior rate-distortion performance. The morphology-based coders, on the other hand, utilize
the morphological dilation operation to delineate the clusters of significant coefficients for improving coding performance.
In this paper, a novel dilation-run image coding algorithm is developed by taking the advantages of both schemes, in which the clustered significant coefficients
are extracted by using the morphological dilation operation and the insignificant coefficients between the extracted clusters
are coded by using the run-length coding method. The proposed dilation-run image coder is implemented in the framework of
bitplane coding for producing embedded bitstreams. Compared with several state-of-the-art wavelet image coding methods, the
proposed dilation-run image coding method achieves comparable rate-distortion coding performance, especially more attractive
for fingerprint type of imageries. 相似文献
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A. C. Downton 《Signal Processing: Image Communication》1995,7(4-6):489-502
Model-based and object-oriented coding algorithms are generally more computationally complex than current block-based image coding standards such as H.261, due primarily to the complexity of the image analysis they require. In this paper, simulations of H.261 and two model-based coding algorithms are analysed in terms of their computational complexity, and mapped onto a generalised image coder parallel-pipeline model. Example implementations of the H.261 coder and an object-oriented coder using general purpose parallel processor systems are then presented to confirm the validity of the performance trend analyses; these achieve maximum speedups of about 11 and 1.7, respectively, using up to 16 processors. The performance trends shown by the analysis indicate that the complexity of model-based coding algorithms, when combined with their reliance on coding picture differences and content-dependent algorithm execution times, interact to make it very difficult to achieve significant speed-up of sequential algorithms. Furthermore, the algorithm complexity and abstract data structures will make direct hardware implementations increasingly difficult. Overcoming these problems to achieve real-time model-based coders may require significant algorithmic compromises to be made. 相似文献