transform domain 中文意思是什麼
transform domain
解釋
變換域-
According to the different characteristics between signal and noise on wavelet transform domain, also considering the voiced and unvoiced speech has different features, a modified method of speech denoising which is using a changing threshold at different scales is proposed
摘要分析了信號和噪聲在小波域的不同特徵表現，並根據語音中濁音和清音的特點，提出了一種改進的多尺度多閾值的小波域語音去噪方法。 -
In this paper, we establish a visual model in ridgelet transform domain, and a new perceptual watermarking algorithm in the ridgelet domain is proposed. the ridgelet transform ( candes and donoho, 1999 ) was introduced as a new efficient multi - scale representation for functions that are smooth away from discontinuities along lines
論文從數字水印發展的現狀出發，對數字水印技術的發展、數字水印技術的基本原理及其通用模型、數字水印技術主要應用的領域及其性能要求、數字水印的分類與典型演算法等多個角度進行了綜述。 -
Two image watermarking methods embed watermarks into transform domain using the multi - scale characteristic of wavelet
兩種圖像方法都是利用小波多尺度的特徵在變換域嵌入水印。 -
A novel communication receiver which uses lapped transform ( lt ) incorporating modified median filter ( mmf ) algorithm is designed for narrow - band interference excision. the lt domain mmf algorithm takes full advantages of the direct sequence spread spectrum signal, as well as the characteristics of lt, performing the transform domain filtering twice. the first filtering locates the position of interference and mitigates most of them. the second filtering is performed in a small neighborhood of the located interference. so lt domain mmf algorithm can completely mitigate the interference without distorting the desired signal. simulation results demonstrate the improved ber performance and increased robustness of our receiver
本文採用改進的重疊變換域中值濾波演算法進行變換域抗干擾處理.該演算法既考慮到直接序列擴頻信號的特點，同時又利用重疊變換的特性對變換域系數進行了二次濾波.該演算法節省處理時間，並且不需要有關干擾的先驗知識，系統性能不會隨干擾頻率變化而變化，因而是一種很穩健的處理方法 -
The design and implementation of transform - domain filter algorithm based on fft / ifft transform is discussed
闡述了基於fft / ifft變換的變換域濾波技術在fpga上的設計與實現。 -
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。 -
In audio robust watermark algorithm, watermark is embedded in transform domain by using the speediness, simplicity and multi - resolution of wavelet transform. when extracting watermarking, the audio is decomposed by single - level discrete 1 - d wavelet transform, and watermarking is extracted by ica based on kurtosis maximization. this method ’ s computational cost is low
音頻水印利用小波變換快速、簡單和多解析度的特點來嵌入水印，提取的時候，先對觀測音頻文件進行一級小波分解，然後用基於最大峰值的ica方法進行水印提取，這種方法避免了其他盲源分離方法必需的求逆運算，所以計算量小。 -
In recent years, the research about the audio digital watermark technology is developed quickly. especially the technology of audio digital watermark in the transform domain, make research have practicability because it can embed information to sensitive area of the carrier
近幾年來，有關音頻數字水印技術的研究工作發展很快，尤其在變換域音頻信息的數據嵌入技術，由於其能將信息嵌入到載體的敏感區域，使得研究更具有實用性。 -
A blended transform domain watermarking based on multi - value sequence modal operator
基於多值序列模運算的混合變換域水印 -
Adaptive run length coding explores the residual redundancy of the high frequency coefficients in the transform domain. hereby, an embedded image coding algorithm based on binary description run length ( bdrl ) is brought forward
對高頻子帶採用自適應的遊程編碼處理，提出一種二進制描述遊程的嵌入式圖像編碼演算法（ bdrl ） 。 -
In fact, scaling technology is an essential component in many image / video processing such as to magnify / minify still image, to achieve special effect like picture - in - picture, to compress or transform digital video with spatial scalability etc. in this thesis we mainly employ this technology in video transcoding, which is a powerful but computationally intensive tools to convert one kind of video format into another, meeting different demand such as lower bitrates or various display terminals. in sum, there are two kinds of scaling schemes : one is in spatial domain and the other in transform domain. the scheme in transform domain can provide very good performance, that is, efficient computation and desirable image quality, whereas it has some disadvantage which is impossible or hardly to o vercome, especially some scenarios require arbitrary ratio zoom in horizontal and vertical, and excellent visual effect
兩種方法都各有其利弊：變換域的方法是利用現有常用的視頻壓縮方案都是基於dct這個特點，所以可以直接在變換域做處理，這樣可以節省大量的計算，但其缺點是由於dct是基於塊的變換，如8 8 ，所以很難找到一種方案可以進行任意比例的縮放，尤其是在縱橫縮放比例不一致的情形，但這對諸如hd縮放到sd和空域分級的壓縮方案來說尤為重要，基於空域濾波的方法卻沒有這樣的限制，同時可以保證縮放后的圖像的質量遠高於基於變換域的方法，為了達到高的縮放質量，就不可避免導致計算量過大。 -
In this paper, a digital image blind watermarking algorithm is proposed based on neighboring relation in wavelet transform domain which can detect watermarking without using the original image
摘要闡述了水印演算法的實現過程，提出了一種基於鄰近關系的小波域數字圖像盲水印演算法，該演算法在水印檢測過程中不需要原始圖像。 -
In this paper, we introduced two watermarking channel models and analyzed discrete cosine transform domain ( dct domain ) watermarking channel model for copyright protection of still digital images
在本文中，我們介紹了兩種水印通道模型，同時分析了一種用於靜態圖象版權保護的oct變換域的數字水印通道模型。 -
This paper researches the integrating application of adaptive antenna array technology, spread - spectrum communication technology and transform - domain filter technology in shortwave communication area, basing on the background of improving on the shortwave communication equipments being used in chinese army, and all the key techniques mentioned above are implemented in a single fpga chip
本文以改造我軍現役短波通信設備為背景，研究了自適應天線陣技術、擴頻通信技術、變換域濾波技術等多種現代數字信號處理技術在短波通信中的綜合應用，並以單片超大規模fpga晶元為硬體處理平臺，對系統中的關鍵技術進行了設計與實現。 -
To overcome the affection of ici and awgn on the ls estimate of the transfer function at pilot tones, the proposed bispectrum - based channel estimation algorithm employ the suppression of ici and awgn components in the received pilot signals by bispectrum and then the accuracy of the estimation is improved. with the channel estimation at pilot tones, an efficient interpolation is necessary. an improved interpolation method based on transform - domain filtering is proposed, which employs dft / idft and filtering in a transform domain so that the effect of noise on the equalization is significantly reduced
針對導頻處通道傳遞函數的ls估計中存在載波間干擾和加性高斯白噪聲的影響的這一問題，本文將傳統的ls估計方法與雙譜相結合提出了一種新型的基於導頻雙譜通道估計演算法，它利用了雙譜對高斯噪聲的抑制作用來減小接收到的導頻信號中的載波間干擾和加性高斯白噪聲的影響，從而提高了導頻子載波上通道估計的精度。 -
It is followed by digital sampling, windowing, noise filtering, endpoint detection, time - domain vector and transform - domain vector
內容涉及語音信號的數字化、加窗處理、預加重濾波、端點檢測，及時域特徵向量和變換域特徵向量。 -
4. a night vision image fusion algorithm based on wavelet transform is put forward in this dissertation. two kinds of original images - low light level image and laser assistant vision image, low light level image and infrared image are fused based on the multiresolution contrast of the source images in the wavelet transform domain
針對微光圖像與紅外圖像的特點，提出了一種基於小波變換的夜視圖像融合演算法，在小波變換域用基於對比度概念的融合演算法對微光圖像與激光助視圖像、微光圖像與紅外圖像進行了融合處理。 -
To solve the problem of watermark encryption, a novel permutation operator is proposed, based on which the permutation scheme and the substitution scheme for watermark encryption are designed ; encryption algorithms in spatial domain and transform domain are proposed. the ciphered image can be jpeg compressed before it is transmitted, and low - distortion plain image can be obtained after decrypting the compressed encryption image
為解決水印信息加密問題，我們在第三章提出混沌有序化運算元方法，設計了水印信息加密的置亂模塊和替代模塊;還給出了空間域和變換域數字圖像加密演算法，密文圖像可以經過有損壓縮再傳輸，經過解密得到低失真的明文圖像。 -
Based on theoretical deductions and data simulations, this dissertation analyzes properties of echo data in time domain, frequency domain and wavelet packet transform ( wpt ) domain. we also analysize properties of complex image data in image domain, image frequency domain and image wavelet packet transform domain. several methods are proposed for jamming suppression in signal domain and image domain respectively
本文在理論推導、數據模擬的基礎上，分析了原始回波數據在時域、頻域和小波變換域的特徵以及復圖像數據在圖像域、圖像頻域和圖像小波變換域的特徵，提出了幾種行之有效的信號域和圖像域抑制方法。 -
By analysises on difference between signal and jamming in wavelet packet transform domain, we study methods of narrowband jamming suppression in signal domain based on wpt. considering the real time feature, and by further analysises on difference between signal and jamming in image wavelet packet transform domain, we propose a method of narrowband jamming suppression in image domain based on wpt ( njsidwpt )
分析了小波包變換域上信號與干擾的差異，在信號域上研究了基於小波包變換的窄帶干擾抑制方法;考慮到方法的實時性，進而分析了圖像小波包變換域上信號與干擾的差異，提出了在圖像域上基於小波包變換窄帶干擾抑制方法（ njsidwpt ） 。
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