coding ratio 中文意思是什麼
coding ratio
解釋
密碼比-
The experiment result shows that the coding and decoding rates are high, and the signal to noise ratio, compression rate and visual quality are quite good
實驗結果表明該方法編（解）碼速度快，並有較好的信噪比、壓縮比及視覺效果。 -
Thus the coding of a color head image actually become the coding of a color component. the experimental results show this method not only improve the coding efficient and compression ratio but also obtain satisfactory effect of the reconstructed image. at the same time, this method also enables gray head images to be converted into color head images
這樣對彩色人頭圖象的編碼實質上就變成了對其中的一個色彩分量的編碼，實驗結果表明該方法不僅提高了編碼效率和壓縮比，也能獲得較滿意的重構圖象效果，同時還使得將灰度人頭圖象轉換成彩色人頭圖象成為可能。 -
In the fifth chapter, author improved huffman coding and lzw coding, which can not only increase the compression ratio, and also make the programe more useful in varied circumstance
在第五章中，作者對huffman編碼和lzw編碼作了改進，這不僅可以在一定程度上提高壓縮比，而且使它們更加靈活通用。 -
So this part is dealt with separately. dcpm method is employed to improve the quality of image coding with making full of the relativity of the wavelet coefficients. according to the different importance degree and vision character of the high frequency wavelet coefficients, different thresholds are applied to remove small coefficients ; then mannos module are applied to remove the visual redundancy ; in order to produce more zero - tree, horizontal and vertical wavelet coefficients are transformed accordingly to improve the compression ratio
對于小波變換后的小波系數的高頻部分，根據其分佈特性和人眼的視覺特性，採用視覺模型對零樹量化過程的閾值進行修正，有效地去除視覺冗餘；對各高頻子圖採用多級樹集合分割的零樹編碼方法，有效地利用系數編碼剩餘符號，進一步提高壓縮比。 -
Taking the storage and transfer of mass image data into consideration, not only could favorable image compression techniques achieve high compression ratio and fidelity, they should also meet the demands of web applications, image compression need further detailed study, thus having developed into a specialized research field known as image coding
出於圖像存儲技術和圖像通信的考慮，良好的圖像壓縮技術不僅能夠實現高壓縮率和高保真率，還能滿足諸如漸進傳輸、圖像漸現等網路應用的需要。因此，為了滿足實際應用的需要，有必要對圖像數據壓縮處理進行深入細致的研究，目前已發展成為專門的研究領域:圖像編碼。 -
Firstly, based on conventional vq, a fast algorithm named equal - sum block - extending nearest neighbor search ( ebnns ) is presented, which not only can achieve the reconstructed image of full search algorithm but also can greatly reduce both the codeword search ratio and chip area. in order to improve coding efficiency, a new algorithm called correlation - inheritance coding is proposed, which is embedded in conventional vq system to improve compression ratio by re - encoding the indexes
首先，在普通矢量量化基礎上提出了等和值塊擴展最近鄰快速碼字搜索演算法（ ebnns ） ，該演算法在圖像畫質達到窮盡搜索演算法的前提下，大大降低了碼字搜索率和硬體實現面積；為了提高編碼效率，在相關性編碼方面，提出了相關繼承編碼演算法，對普通矢量量化后的編碼索引進行無損重編碼。 -
3. studying still image transmission systems without channel coding or with turbo codes over both awgn and rayleigh fading channels by matlab simulation. simulation results show that turbo codes not only advance the dependability of communication systems, but also reduce channel signal - to - noise ratio ( snr )
將turbo碼應用於靜止圖像傳輸系統，信源編碼採用矢量量化編碼，分別在awgn通道和rayleigh衰落通道下，對不採用通道編碼和採用turbo碼作為通道編碼的各種情況進行模擬。 -
Then it is possible to realize high compression ratio of images. in this paper the principle of which wavelet transform can be used in images compression is discussed on basis of statistics and analysis of image ' s wavelet coefficients after wavelet decomposition. also some kinds of quantify and coding schemes are discussed including scalar quantization, vector quantization, embedded zerotree wavelets encodings run length coding, huffman coding and so on
論文對圖像經分解后的小波系數進行統計與分析，闡述了小波變換所以能夠用於圖像壓縮的道理，並在此基礎上討論了多種量化和編碼方案的設計與實現，包括標量量化、矢量量化、嵌入小波零樹編碼、行程編碼、哈夫曼編碼等，其中對jpeg2000採用的標量量化和嵌入小波零樹編碼作了重點討論和分析。 -
This method has many advantages compared to the latter and is testified by many images. ( 2 ) because fractal coding has the characteristic of high compression ratio, this thesis designed a spatial self - embedding watermarking technique. after self - embedding, it can detect any changes to a watermarked image as well as localizing the areas that have been tampered
（ 2 ）鑒于分形圖像壓縮具有很高的壓縮比且重構圖像效果好的優點，本文利用分形壓縮實現了一種空域自嵌入水印演算法，不但能對篡改區域進行有效定位，而且具有修復功能。 -
By analyzing the correlations of r, g, b components of a color image a new color image compression coding method based on fractal theory was proposed. compression ratio was increased and coding speed was fairly high
根據三色分量的相關性，本文提出基於三色分量配塊的分形彩色圖像壓縮方法，在壓縮比和編碼速度上都有較大的提高。 -
According to the information that reflected the condition of channel, this thesis classified acm into heuristic acm and snr - estimation acm. the system that using the first one of acm decide the scheme of modulation and coding according to the frame error ratio that reflected indirectly the condition of channel, while it using the another of acm decide the scheme according to the snr estimation
根據反映通道狀態的信息不同，本文將自適應編碼調制技術分為基於探索的自適應編碼調制技術和基於通道信噪比預測的自適應編碼調制技術，前者根據間接反映通道條件的誤幀率和重傳次數信息來決定編碼調制方式，而後者根據通道信噪比預測的結果調節編碼調制方案。 -
One is to use fourier transformation to convert the source signal from time domain to frequency domain and to discard high frequency harmonious components upwards of 19 ( gb / t14953 - 93 d5. 3 demanding ), then to have static huffman coding to the quantized char array which is composed of reserved direct current component and basic wave and each high frequency " s amplitudes and angles. the other is to use discrete wavelet transformation to convert the source signal from time domain to frequency domain and to set the high frequency coefficients that its absolute value is smaller than the given threshold to zero, then to have dynamic huffman coding to the quantized char array which is composed of multiple, wavelet ' s level, datum length, low frequency coefficients and reserved high frequency coefficients. mass simulinks and analyses under the two circumstances have done to show that data compression ratio is small and the relative error is also small and within the permission of engineering and the compression problem can be solved in theory of measured datum of power system
第一種情況的壓縮方法為：採用傳統的傅立葉變換把原始信號從時間域變換到頻率域，舍棄20次及其以上的高次諧波成分（保證了gb / t14953 ? 93d5 . 3要求） ，然後對保留的直流分量、基波和各次諧波的幅值和相角數據量化后和量化時分別乘以的倍數系數構成一個數組，以字元形式保存，採用靜態huffman編碼對變換數據進行壓縮；採用離散小波變換把原始信號從時間域變換到頻率域，然後對分解得到的高頻系數進行閾值量化處理，對乘以的倍數系數、小波變換的階數、小波變換后的低頻、各級高頻以及原始數據長度、量化后的低頻系數以及保留的高頻系數大小、位置構成一個數組，以字元形式保存，採用動態huffman編碼對這個文件進行壓縮。 -
Simulation has shown that the proposed scheme can achieve more accurately in similarity examination than scheme which proposed by [ 102 ]. so the bit number of coded video stream was decreased about 22. 95 percent and thus the compression ratio was improved. although the coding cost was increased about 8. 25 percent by using proposed scheme
模擬實驗表明，與文獻[ 102 ]方案相比，提出的方案雖然增加了約8 . 25的編碼器編碼耗時，卻有效提高了對視頻序列突變幀的檢測精度，從而進一步降低編碼器端輸出編碼視頻流的比特數達22 . 95左右，在基本不影響重構視頻信息視覺質量的同時提高了編碼器的壓縮效率。 -
Experiments validate that the encoder can realize real - time video coding at the speed of 25 cif pictures per second. moreover it possesses good visual quality and high compression ratio
通過測試驗證，該編碼器在保持很好的圖像質量和高壓縮比的同時，實現了實時的視頻壓縮，處理速度可以達到cif格式的25幀/秒。 -
In contrary to the brushlet, the ezw ( embedded zerotree wavelet coding ) algorithm is also discussed. the performance of brushlet in preserving the high frequency information at high compress ratio can be revealed when compared to the ezw algorithm in the result
作為對比，本文同時研究了ezw小波系數零樹編碼演算法，從對比中可以看出brushlet在高壓縮比下保留圖象高頻信息的性能。 -
With the mean of range block, the compression ratio is improved, the coding time and reconstruction time are decreased. then we discuss the relations among range blocks covariance, contrast scaling s and mse
採用值域塊均值作為分形編碼的參數可加快分形編碼的速度，提高壓縮比和加快分形圖像壓縮解碼的收斂速度。 -
Therefore, coding file only stores ifs code, which can achieve high compression ratio
因此，編碼文件只需存儲ifs碼，從而能得到較高的壓縮比。 -
The second, on the foundation of analyzing with comparing some important coding standards of video at present, the thesis puts forward a project of video coding standards adopting this system. it also realizes the functions of using video compression of mpeg - 4 to compress the video data with the big ratio, using the vfw to gather and deal with the monitoring video on time, using directshow to realize the function of playing back of video streams
第二，在分析和比較目前各種視頻編碼技術的標準的基礎上，提出了本系統所採用的視頻壓縮編碼方案，實現了用mpeg - 4視頻壓縮模塊對採集視頻進行大比率壓縮，用vfw及時對監控視頻進行採集、處理，用directshow技術實現視頻流的回放功能。 -
This paper mainly realize integer wavelet transform using lifting scheme, then study and compare several embedded coding arithmetic. base on analyzing the image coefficient, we propose an improved ezw ( embedded zerotree wavelets ) arithmetic. jt aimed at increasing compression ratio in lossless image compression and subjective quality in loss image compression
本文主要利用提升演算法實現圖像的整數小波變換，然後對幾種經典的嵌入式圖像編碼演算法進行了研究和比較，在對經過小波變換的圖像系數進行統計分析后，提出一種對ezw （ embeddedzerotreewavelets ）演算法進行改進的嵌入式圖像壓縮編碼演算法。 -
This method not only quickens the coding speed, but also improves the peak value signal - to - noise ratio ( psnr )
不僅加快了編碼速度，而且提高了圖像的峰值信噪比（ psnr ） 。
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