5 离散余弦变换(Discrete Cosine Transform,DCT)表征图像 6 主成分分析(Principal Component Analysis,PCA)表征图像 参考资料 数字图像(digital image)是指以二维数字组形式表示的图像,是不同亮度或不同颜色组成的矩阵,可以通过数字相机、扫描仪直接获得,或者扫描光学影像的底片经采样量化后获得。 数字图像处理(digital ...
Inverse discrete wavelet transformMean square errorPeak signal-to-noise ratioStructural similarity index measurementIn digital image processing, image compression has prominent significance to improve the storage capacity, transmission bandwidth and transmission time. Basically, in image compression, the ...
Compute the discrete cosine transform of the image data. Operate first along the rows and then along the columns. Get Q = dct(P,[],1); R = dct(Q,[],2); Find what fraction of DCT coefficients contain 99.98% of the energy in the image. Get X = R(:); [~,ind] = sort(abs...
Implementation of Image compression using DCT jpegrledct-coefficientsrun-length-encodingimage-compressiondiscrete-cosine-transformdctjpeg-image-compression UpdatedOct 5, 2018 Python Zafar's Audio Functions in Python for audio signal analysis: STFT, inverse STFT, mel filterbank, mel spectrogram, MFCC, CQ...
A digital watermarking algorithm based on secret image scrambling and discrete cosine transform(DCT) domain is proposed.Research results show that it is a better invisible and highly robust algorithm.Different image processing schemes are used to attacking experiments.Tests indicate that it is a highly...
研究点推荐 Digital Image Watermarking DCT Zip Compression Technique spreadspectrum- like discrete cosine transform (DCT) domain watermarking 站内活动 0关于我们 百度学术集成海量学术资源,融合人工智能、深度学习、大数据分析等技术,为科研工作者提供全面快捷的学术服务。在这里我们保持学习的态度,不忘初心,砥砺前...
2-D inverse discrete cosine transform collapse all in pageSyntax B = idct2(A) B = idct2(A,m,n) B = idct2(A,[m n])Description B = idct2(A) returns the two-dimensional inverse discrete cosine transform (DCT) of A. example B = idct2(A,m,n) and B = idct2(A,[m n]...
Digital Watermarking (DWM) is a technique of protecting digital data. This code base implements 2 methods for marking digital images based on Discrete Cosine Transform (DCT) and Discrete Wavelet Transform (DWT). Several attacks (signal degradations such as noise, dithering, filterin...
摘要:文章基于脉动阵列实现HEVC(High Efficiency Video Coding)中8×8的整数DCT(Discrete Cosine Transform)变换,改进通常使用的蝶型算法。整体架构基于脉动阵列的思想,并采用中间值数据重组的设计,使得变换模块可同时实现行列变换操作。只需得到列变换的第一个值便可开始行变换,充分利用了PE单元,减少变换时间并提高计算...
A class of lifting based integer wavelet transform A class of integer wavelet transform (IWT) which are parametrized simply by one free parameter is presented . The class of IWT is obtained by a lifting bas... DBH Tay,SO Engineering - International Conference on Image Processing 被引量: 56发...