Results 31 to 40 of about 168 (110)
四川大学学报. 自然科学版, 2015 本文对基于DPCM与整数小波相结合的算法在无损图像压缩中的应用进行了深入研究.研究表明,分块图像数据经过整数小波变换后仍存在冗余,对这些冗余的数据进行分析,可通过DPCM编码,对变换后的数据做进一步的压缩.由于5/3整数小波变换的特性,其冗余信息主要分布在水平、垂直和对角线的方向.因此,本文在大量实验数据的基础上,提出了一种按照冗余信息的分布规律,构造出预测模板,再对变换后的不同的子带系数选择相应的、开销最小的模板进行残差系数冗余信息去除的方法.实验结果表明 ...
吕顺, 何小海, 杨龙, 孟勇
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Guangtongxin yanjiu, 1979 <正> 一、前言对于图象信号来说,DPCM是效率比较高的频带压缩编码方式之一。它是利用图像中各像素之间的相关性,根据已经出现的像素值进行预测,只对实际值和预测值的差值进行编码的方式。如文献中所述,对于彩色电视信号来说,由于在信号频谱中存在着以色副载频为中心的已调色信号,从而使像素之间的相关性降低。这时,如果对它直接施行DPCM编码,就不能充分发挥这种编码方式的效率 ...
李铭久
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Legge 464/1984 e conoscenze geologiche a scala nazionale
Acque Sotterranee, 2019 Nel febbraio scorso è stato presentato nelle sedi deputate il Piano nazionale denominato Proteggitalia (Piano nazionale per la mitigazione del rischio idrogeologico, il ripristino e la tutela della risorsa ambientale, adottato con DPCM 20 febbraio 2019 ...
Commissione Risorse Idriche Consiglio Nazionale Geologi
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Guangtongxin yanjiu, 1979 <正> 本设计包括三个部分:一是为了适应分离编码的需要而将彩色全电视信号分离成亮度信号Y和两个色差信号U、V,送入各自的DPCM编码器中的彩色电视信号分离设备的设计;二是将DPCM译码还原出来的亮度信号Y和两个色差信号U、V,组成彩色全电视信号的彩色编码器的设计;三是提供彩色全电视信号中的复合消隐信号、复合同步信号、色同步信号等辅助信号的彩色同步机的设计。
刘梏
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Performance Evaluation of Data Compression Systems Applied to Satellite Imagery
Journal of Electrical and Computer Engineering, 2012 Onboard image compression systems reduce the data storage and downlink bandwidth requirements in space missions. This paper presents an overview and evaluation of some compression algorithms suitable for remote sensing applications.
Lilian N. Faria +2 more
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PSNR Improvement using Different Prediction Coding in Image Compression
Tikrit Journal of Engineering Sciences, 2010 Differential Pulse Code Modulation (DPCM) is one of the predictive coding techniques. The number of previous pixels employed in the estimate operation is referred to as the order of the predictor. Predictor using one pixel for estimation is called “first
Khamies K. Hasan
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Robustness Stability Analysis of Higher-Order DPCM Prediction Filters
Elektronika ir ElektrotechnikaThis paper considers the robustness of the differential pulse-code modulation system with higher-order predictors. Special attention is paid to the robust parametric stability of the prediction filters with respect to the predictor coefficients.
Nikola B. Dankovic +5 more
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Sensors, 2016 In this article we present the main results obtained in the ARTEMIS-JU WSN-DPCM project between October 2011 and September 2015. The first objective of the project was the development of an integrated toolset for Wireless sensor networks (WSN ...
Christos Antonopoulos +23 more
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The Journal of the Institute of Television Engineers of Japan, 1974 DPCM (Differential PCM) 方式は, 画像信号の画素聞相関に着目して, 高能率符号化を行う予測符号化の一種で, 比較的簡単な装置構成で通常のPCM符号化に対して画素当り2～3ビットの節減が可能である.本文ではDPCMの原理, 高能率化の技術, 伝送特性, カラーテレビ信号への適用などにつき基本的事項を紹介した.
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Implementation of Hybrid DCT/DPCM Video-Encoder in the DM642 EVM for Educational Purposes
Advances in Electrical and Electronic Engineering, 2006 There is presented implementation of hybrid DCT/DPCM video-encoder in the power ful TI’s media processor TMS320DM642 embed in evaluation module DM642 EVM. Code Composer Studio 3 is used as working space.
Jozef Huska, Peter Kulla
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