fractal encoding 中文意思是什麼
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3. brings forward a watermark method based on fractal theoretics this paper has a novelty that joins the fractal technology, dct and dwt transform, watermark technology together. fractal technology has strong vitality on the image encoding. dct and dwt transforms have broad applications on the image process. so this paper introduces fractal technology into watermark technology, brings forward fractal watermark technology in dct and dwt domain and tests the fractal watermark technology by many tests. fractal technology is a new thought and solved scheme without doubt
3 .提出了基於分形理論的數字水印方法將分形技術、 dct和dwt變換技術、水印技術有機地結合起來是本文的一大創新，分形技術在圖像編碼方面具有強大的生命力， dct和dwt變換技術在圖像處理方面有著廣泛的應用，因此本文將分形變換技術引入到數字水印技術中來，分別在dct域和小波域內提出了分形水印技術，並且通過大量的實驗證實了分形水印技術的可行性，這無疑是一種新的思想和解決方案。 -
On the basis of the authors ’ results published in this journal [ 67 ], this paper further proposed two strategies which improved both quality and speed of fractal encoding : one, a priori adding additive white gaussian noise into the image being encoded to reduce the domain blocks that are unlikely to meet the constraint on contrast scaling factors ; the other, range blocks with small standard deviations are directly approximated by the constant block ( i. e., all the
在筆者原有結果[計算機模擬， no . 8 ， 2004 ]的基礎上，本文提出進一步提高解碼圖像質量和編碼速度的方案:一是預先在待編碼圖像中添加高斯白噪聲以進一步減少不滿足對比度因子約束的domain塊的數目;二是對小方差range塊直接用其均值塊代替以進一步加快編碼速度。 -
A image retrieval model of fractal - based encoding topological characteristic
基於并行遺傳演算法的圖像超解析度復原 -
Theoretically, fractal dimension has powerful ability to classify image blocks, which results in big speed - up ratio in fractal encoding ; and fractal dimension is a continuous value, which enables us to adjust the quality of decoded images by changing the number of classes
在理論上，由於這種維數具有很好的分類能力，使得這種方法可取得很大的加速比；由於這種維數是連續量，還可通過改變分類數目來調節解碼圖像的質量。 -
Theoretically, this quadrature can classify image blocks effectively, which bring out big speed - up ratio in fractal encoding ; and this feature is a continuous value, which enables us to adjust the quality of decoded images by changing the number of classes. our experimental results show that, comparing with exhaustive search, when the class number is 25, we obtain 20 times speed - up ratio, with only image degeneration of 2. 08db, at the same compression ratio
_ }速比;這種不變量也是連續量，大量的數值實驗表明，因此還可通過改變分類數目來調竹解碼圖像的質量在壓縮比相同的前提下，與全局搜索法相比，塊分為25類時，可取得約20倍的加速比，而解碼質量只相差2 -
Based on adaptive quad - tree fractal image encoding scheme, the concept and algorithm of peak signal noise ratio ( psnr ) based on the fractal codes is put forward, and is used to match the similarities between images
本文以自適應四叉樹分割的分形圖像編碼為基礎，提出了圖像的分形碼峰值信噪比的概念和演算法，在無須解碼的情況下，直接對分形碼來量化圖像間的相似性。 -
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 this dissertation, some fast fractal image encoding and controllable progressive decoding scheme are proposed, as follows : ( 1 ) because of existed fast encoding methods are often at the cost of reconstructed image quality, or can only obtain poor speed - up ratio
為此，本文在快速分形編碼方面和漸進解碼方面作了以下研究工作: （ 1 ）針對目前許多分形編碼加速方法或者以犧牲解碼圖像質量為代價，或者加速效果不明顯的情況。 -
The method of fractal image compression transfers a digital into a group of contract iterate function system ( ips ) model. encoding ifs ' s parameters achieves image compression. this method may gain higher compression ratio, as well as decoding rapidly
分形圖象壓縮方法是根據圖象的自相似性，將一幅數字圖象轉化為一組收縮的迭代函數系統模型，通過對迭代函數系統參數編碼達到圖象壓縮的目的。 -
The kernel of improvement is that fractal predictive encoding is imported into mzte, and wavelet coefficient is encoded in zte mode or in fractal mode according to in which mode the encoding error is minimum
這種改進的核心思想是通過引入分形預測編碼方法，根據具體情況，綜合使用零樹熵編碼和分形預測編碼方法對圖像小波分解系數進行編碼。 -
Then the fractal dimension can be used to classifying the blocks in the encoding phase, resulting in a great reduction to number of domain blocks to search for, hence shortening the encoding time dramatically
在分形編碼時，用這個維數值來對圖像塊進行分類，大大減少了編碼時定義域塊的搜索數目，達到了加速編碼的目的。 -
However, there ' s a especially unsatisfying problem in this method : too long encoding time, mainly because of the considerable number of domain blocks to compare with for each range block in encoding phase, which, in fact, prevent fractal image compression from becoming a practical method for image compression, hence fast encoding has become a hot issue in fractal image compression
但是，這種方法存在一個最大的問題：編碼時間過長，主要是因為編碼時定義域塊的搜索量非常可觀。這實際上已成為了該方法走向高效能實用化的最主要障礙，因此分形編碼加速方法已成為了近些年來分形壓縮的一個研究熱點。 -
Its purpose enhances the fractal compression encoding efficiency and has high quality rebuilding image
提高了經典分形編碼的壓縮效率，並且保證獲得高質量的重建圖像。 -
The author begins with this facet of the algorithm which can reduce the number of the matching of bloks in the process of the search, and therefore designs an optimized fractal image compression algorithm which aims to decrease the complexity of the fractal encoding and reduce encoding time
摘要從減少搜索匹配塊的數目入手，提出了一種旨在降低分形編碼的復雜度，縮短編碼時間的分武力像壓縮的改進演算法。 -
Note that in fractal encoding, each range block is to compare with domain blocks after some grey - level affine map. hence we first put forward a kind of image quadrature invariant of affine maps above, which can be thought of a generalization of mario feature
由於在分形編碼時值域塊實際上是與經過灰度仿射變換之後的定義域塊進行比較，因此我們首先提出了一種在灰度仿射變換下保持不變的圖像矩不變量，它可看作是mario特徵的推廣。 -
Fast fractal image encoding based on mean deviation - ordered
基於平均偏差排序的快速分形圖像編碼 -
In this dissertation, several speed - up techniques for fractal image encoding are proposed, as follows : 1
本文在快速分形編碼方面作了以下研究工作： 1
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