fourier cosine transform 中文意思是什麼
fourier cosine transform
解釋
傅里葉餘弦變換-
Then, based on the theory of discrete fourier transform, discrete cosine transform and discrete wavelet transform, two invisible image watermarking schemes in transform domain are proposed, one is circular symmetric spread spectrum digital image watermarking based on chaotic sequences, the other is the hybrid image watermarking based on wavelet decomposition and discrete cosine transform. finally, the good performance of the two algorithms is verified by some common image processing and attack experiments
在分析了dft 、 dct 、 dwt的理論與演算法的基礎上，提出了兩種基於變換域的圖像隱形水印方案? ?基於混沌序列的圓對稱擴頻水印方案和基於小波分解和餘弦變換結合的水印方案，並通過一些常見的圖像處理及攻擊實驗驗證了這兩種演算法生成水印的性能。 -
Except the simple and usual filter and algorithm, some advanced filter ways such as frequency sampling filter, karlman filter and several new algorithms such as cosine algorithm, semiwave fourier algorithm and wavelet transform algorithm are also studied
除簡單、常見的濾波和演算法外，本章還探討了一些性能先進的濾波方法如頻率抽樣濾波、卡爾漫濾波和幾種微機保護新演算法如餘弦演算法、半波傅氏演算法以及小波變換演算法等。 -
Fractional fourier transform of two - dimensional cosine - gaussian beams based on the wigner distribution function
二維餘弦高斯光束基於魏格納分佈函數的分數傅里葉變換 -
Secondly, this paper details the basic theory of fourier transform, and the problems which must be paid attention to in the practical application. the reasons of the error caused by the traditional electric signal detection methods based on the windowed dft are thoroughly analyzed. besides, many cosine windows are introduced
其次對傅立葉變換的基本理論、基本形式以及實際應用中應注意的問題進行了詳細的闡述，對傳統的基於加窗dft的諧波檢測方法的誤差原因及減少誤差的方法進行了分析，並介紹了各種不同的餘弦窗函數，進而簡要分析了幾種常見的頻譜校正方法。
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