entropy encoder 中文意思是什麼
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However, there still exists correlation between coefficients of sub - matrices after 4d - mdct. this thesis proposes a four dimensional matrix video coding method based on context to get rid of the correlation between coefficient sub - matrices further. it includes three parts as follows : firstly, this thesis presents a four - dimensional matrix video encoder and decoder model, which contains components of prediction, transform and entropy coding
實驗結果表明，該方法與傳統的二維編碼方法相比，具有高壓縮比和高圖象質量的優點;與矢量量化編碼相比，具有碼表體積小，計算復雜度低的特點;與霍夫曼編碼方法相比，在相同信噪比的條件下，對運動相對劇烈的視頻序列壓縮效果要更好。 -
3 ) furtherly, an entropy encoder can compress the quantified values losslessly, and give a better overall compression result, too. in this paper, a new adaptive arithmetic coding scheme is given
3 ）在熵編碼階段，比較了huffman編碼和算術編碼的優缺點，最後選取了一種自適應的算術編碼方案。 -
This thesis gives an overview of entropy coding in jpeg 2000, especially the code - block based coding and context based adaptive arithmetic coding. to optimize the implementation of mq encoder, several methods are adopted to optimize the algorithm which is emulated in matlab
因此本文對jpeg2000標準中位平面編碼和基於上下文的自適應二進制算術編碼技術作了詳細的分析和研究之後，對自適應算術編碼演算法優化使其更適合於硬體實現。 -
First, the coefficients of wavelet are quantized by the threshold formed by the eye ' s sensitivity to it ' s subband. then, wavelet coefficients are encoded by the entropy encoder, with the contexts formed by quantizing their prediction values, which are determined by their neighbors in space and time dimensions
它首先利用人眼視覺模型（ hvs ）對子帶的系數進行量化；然後利用空間和時間相鄰的系數對當前系數進行預測，以預測值的量化值作為上下文，對系數進行基於上下文的算術編碼。 -
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。
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