Search - image sub blocks

Search - image sub blocks - List

[Graph program] SVD_DWTimage DL : 0: 提出了一种新的基于离散小波变换(DWT)与奇异值分解(SVD)相结合的数字图像水印算法。该算法将原始图像作小波分解并将小波分解得到的低频子带进行分块，对每一块进行奇异值分解后，选取每块中最大的奇异值通过量化的方法嵌入经过Arnold置乱后水印信息。-A new wavelet transform based on discrete (DWT) and Singular Value Decomposition (SVD) combination of digital image watermarking algorithm. The algorithm for wavelet decomposition of the original image and wavelet decomposition low-frequency sub-band are divided into blocks, each a singular value decomposition, the selection of each block by the largest singular value methods to quantify Arnold scrambled after embedding the watermark .
Date : 2025-12-14 Size : 38kb User : 久久
[Graph program] matlab DL : 0: ) 使用分块的主成分分析方法(PCA)对人脸图像进行压缩编码。针对PCA方法计算量大的缺点,首先把问题转化成奇异值分解(SVD)问题,然后设计了特征空间的更新算法,通过递推,简化每一步计算的计算量,达到了实时编码的要求。 4) 在Windows平台下基于Video for Windows(VFW)接口开发了人脸视频图像编码和解码的实验系统,该系统实现了图像采集、图像显示、编码、解码等功能。-) The use of sub-blocks of principal component analysis (PCA) on the human face image coding. PCA method for large defects, first of all the issues into a singular value decomposition (SVD) problem, and then design a feature space of the update algorithm, recursive, simplifying the calculation of the amount calculated at each step to achieve real-time encoding requirements. 4) In the Windows platform based on Video for Windows (VFW) interfaces, the human face image coding and decoding video experimental system, the system achieved image acquisition, image display, encoding, decoding functions.
Date : 2025-12-14 Size : 1kb User : 周参
[Graph program] 4 DL : 0: 基于四叉树分割的JPEG隐写分析当前主要的隐写分析方法都是对整幅图像进行特征提取，而忽略了图像的内容差异。该文提出一种基于四叉树分割的 JPEG 隐写分析方法，该方法根据图像块的纹理复杂度进行图像分割，对具有相同统计特性的子图像分别进行隐写检测特征的提取，并构造相应的分类器，通过加权融合得到最终的检测结果。实验结果表明该方法具有良好的性能，尤其是在训练与测试图像的统计特性具有较大差异时，该算法的检测准确率提高更加明显。 -Based on quadtree segmentation JPEG steganalysis current major steganalysis methods are on the whole image feature extraction, while ignoring the differences in the content of the image. This paper presents a quadtree segmentation based on JPEG steganography analysis, the method according to the complexity of the image blocks of texture image segmentation of sub-images have the same statistical characteristics were steganography detection feature extraction, and configured accordingly classifier, to get the final test results by weighted fusion. Experimental results show that the method has good performance, especially with a large difference in the statistical properties of the training and test image when the algorithm to improve detection accuracy is more obvious.
Date : 2025-12-14 Size : 894kb User : fangsm