預先壓編 的英文怎麼說
中文拼音 [yùxiānyābiān]
預先壓編
英文
precompression-
Fractal coding has been proved useful for image compression. it is also proved effective for content - based image retrieval. in the paper, we present a block - constrained fractal coding scheme and a matching strategy for content - based image retrieval. in this coding scheme, an image is partitioned into non - overlap blocks of a size close to that of a query iconic image. fractal codes are generated for each block independently. in the similarity measure of fractal codes, an improved nona - tree decomposition scheme is adopted to avoid matching the fractal codes globally in order to reduce computational complexity. our experimental results show that our coding scheme and the matching strategy we adopted is useful for image retrieval, and is compared favorably with other two methods tested in terms of storage usage and computing time
分形編碼在圖像壓縮方面取得了很好的效果，同時，分形編碼也能夠用於基於內容的圖像檢索.本文提出了一種基於塊限制的分形編碼演算法和匹配策略，並將它們用於圖像檢索.在我們編碼演算法中，圖像會被預先分成互相不重疊的子圖像塊，然後對這些子圖像進行獨立地分形編碼，從而獲得整幅圖像的分形碼.該編碼演算法能夠在很大程度上減少編碼時間.在進行圖像間相似性的匹配時，我們採用改進的基於九叉樹的分配策略，從而避免全局地進行分形碼的匹配，減少了計算量.實驗結果說明，我們的編碼演算法和匹配策略能夠比較有效地應用於基於內容的圖像檢索，在計算時間和存儲時間上都優于實驗中其它兩種方法Firstly, four alternative mode was introduces for h. 263 data compress arithmetic : the mode of nonrestrictive sportive vector, syntax - based arithmetic coding mode, the mode of supernal forecast, and the mode of pb frame
首先詳細介紹了數據壓縮演算法h . 263以及h . 263演算法的四個可選模式:非限制運動矢量模式;基於語法的算術編碼模式;高級預測模式; pb幀模式。Giving the goal and conceptual design, this paper pays attention to expatiate how to practically use the techniques of image - processing, communication and recognition in remote image monitoring system, and discusses how to realize the key techiques such as terminal connection and frame design, platform decoding control and alarm, image communication and track, etc. in order to overcome most existing image monitoring systems " shortages - those systems are at low intelligent level, need overfull manual work and ca n ' t work all day, this paper has adopted the advanced image code / decode technology and digital image transmission technology, and has applied the intelligent image processing and recognition technique to the display, adjust and track of images
本論文在設計圖像監控系統的建設目標和總體方案的同時，重點闡述了圖像處理、通信與識別技術在遠程圖像監控系統中的應用實現，給出了圖像監控系統中的終端接入和框架設計、雲臺解碼控制與報警、圖像通信和圖像跟蹤等關鍵技術的實現。針對現有的圖像監控系統大部分採用人工為主，機器為輔，智能化程度低，不能全天候工作的現狀，本文採用先進的數字圖像壓縮編解碼技術、數字圖像傳輸技術，將智能圖像處理與識別技術應用於圖像的顯示、調整、跟蹤，克服了一般監控系統要求監控人員過多地干預、智能化程度低的缺陷，並總結了其特點和優勢。A new bit rate control strategy with both global pre - allocation and local segmentation ( glas ) for low bit rate application is proposed. first, it allots bit date to every frame in advance according to possessive rate of buffer, and then distribute different quantization parameters according conctete detail. by means of this method, buffer is controlled more particularly. and the quality of decoded image is improved, the traditional video image coding method, that is to say, the intraframe coding based on dct and the interframe prediction coding based on motion compensation, is not suitable for low bit rate compression and aside from this, the encoder is too complicated
它首先在總體上根據緩存器的佔有率給每幀預分配比特數，然後再根據具體細節給予不同的量化參數。使緩存器得到了更細致的控制，解碼圖像的質量有所改善。針對傳統的視頻圖像編碼方法，即幀內基於dct的編碼加幀間基於運動補償的預測編碼存在不適于低比特率壓縮，編碼器復雜等不足，討論了基於3 - ddct的xyz視頻圖像壓縮編碼方法，提出了3 - ddct系數的三維「 z 」形掃描方案，大大提高了編碼效率。In the paper, chapter 1 gives a comprehensive introduction of digital image compressing including its recent status, technical standards, classification in the world. chapter 2 introduces briefly the thought and ii procedure of vector quantization, describes lgb algorithm and vector quantization based on sofm neural network. chapter 3 discusses predictable coding in lossy and lossless aspects, analyzes adaptive predictable coding based on bp neural network, introduces the evaluation of algorithm on neural network in image compression. chapter 4 discusses the applications of mathematical transformation in image compression and does experiments related, analyzes the strategies of image coding in transformed domain. in chapter 5 images are decomposed and represented by wavelet transform, then discusses the characteristics and effects of wavelet functions in image compression, analyzes the wavelet coefficients after images are decomposed ; based on the theories and analyses in the prior chapters, the paper presents an image compression scheme and gives results. the test results shows that the image compression scheme is practical and helpful to map into the local content of images to get rid off redundancy, so that, it can require satisfactory results of image compression
方案首先利用小波多分辨分析性質，對圖像進行小波分解，對分解后各子圖的小波系數進行了統計分析，針對各子圖的小波系數特點，對不同的子圖分別採用不同的壓縮方法，低頻子圖採用基於神經網路的自適應預測編碼，高頻子圖採用基於神經網路的矢量量化編碼，從而實現對圖像數據的壓縮處理。本論文第一章介紹了數字圖像壓縮處理的國內外當前的概況以及其技術標準和分類。在第二章，介紹了數字圖像的矢量量化技術的數學思想和過程，對lbg演算法和基於sofm神經網路的矢量量化進行了闡述、分析。This paper propose a improvement method of mzte, adopted in mpeg - 4 for encoding stilltexture. firstly, the basic conception of image / video compression is provi - ded, and then the conception of wavelet decomposing and fractal predictive encoding, lastly, mzte and it ' s improvement is illuminated detailedly
首先分析了圖像及視頻壓縮的技術現狀，論述了小波分解及在圖像壓縮中的應用、分形預測編碼的理論和方法，然後重點對mzte進行了深入的論述分析，最後對mzte的改進作了詳細說明。In the first part the wavelet analysis theory is systematically summarized in the perspective of signal analysis and digital signal processing. in succession, the excellent of the wavelet image coding techniques are introduced with the focus on the ebcot coding algorithm. at the last part, aiming at the properties of hyperspectral images, three compression schemes are presented : dct + ebcot, differential method + ebcot and predictive method + ebcot
文中首先從信號分析和數字信號處理的角度對小波分析理論進行了系統的總結，在此基礎上介紹了基於小波的圖像編碼技術的優秀成果，重點介紹了基於小波的ebcot編碼演算法，接著，針對高光譜圖像的特徵，本文提出了以下三種壓縮方案： dct變換+ ebcot的壓縮方案、差值法+ ebcot的壓縮方案及預測法+ ebcot的壓縮方案，對三種壓縮方案進行了軟體模擬，並將模擬結果與其它壓縮方案進行了比較。This paper first research on main technologies used by avs standard, which include prediction, transform, quantization, in - loop filter, and entropy encoding, and then focus on the 2d - vlc entropy coder of avs, which is context - based adaptive coder. this encoder operates on run - level pair, and it uses the type of current block and value of current coefficients to switch vlc code - table. these tables are designed according to the distribution of transformed coefficients, and this way is much better than using only one table to code all residual coefficients in one 8x8 block
本文首先詳細研究了avs標準的核心技術，包括預測編碼、變換量化、環路濾波器以及掃描和熵編碼等，之後重點研究了avs標準中使用的基於上下文的2d - vlc變長編碼方法，這種方法編碼的是（ run ， level ）數對，同時根據當前編碼塊的類型和殘差系數這兩種上下文信息來切換碼表，這些碼表是預先根據變換系數在不同位置的分佈信息設計好的，這樣要比只使用一個變長碼表來編碼塊內所有位置上的殘差系數的壓縮效果要好得多。Instead of directly coding and transmitting all four sub - frames, only two sub - frames are encoded by separate h. 264 encoders and transmitted ; while the others are first predicted by the former two ( actually, each pixel is predicted by its four neighbors in the original image ), and only predicted errors are encoded and transmitted
對于亞采樣得到的四個子序列，前兩個通過h . 264 / avc編碼器進行壓縮編碼傳輸，后兩個則先用前兩個進行預測，再編碼傳輸其預測誤差。分享友人