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blindwatermark
- 数字水印程序,包括多分辨嵌入水印、提取水印程序,盲水印嵌入、提取程序,以及滤波攻击和JPEG攻击程序,PSNR和相似度计算公式(MATLAB)-digital watermarking procedures, including multiresolution embedded watermark, watermark extraction procedure, blind watermark embedding and extraction procedures, Filtering and
Vectorization-and-Edgereserved-Quantization-of-Ima
- 本文通过对JPEG图象压缩标准的分析,找到了一种解决这一问题的方法,即保边缘图象量化方法。在JPEG量化前,通过分析判断这一图象块是否为边缘所在块,对于边缘所在块采用较细的量化步长;对于其他块可使用较粗或者原始的量化步长进行量化,这样便可改善图象边缘处的质量。文中是利用了DCT 变换后的直流系数DC值来确定图象边缘块的,因为直流系数为这一图象块的平均亮度,如果相邻块的DC值变化较大,则它所包括的边缘细节就较多,否则说明这一图象块变化平缓,包含边缘少。根据DC值的变化我们可以大致决定这一块的量
test3
- 编程实现基于8×8子块的DCT图像变换,基于JPEG量化矩阵的量化与反量化,基于8×8子块DCT的图像重建;以一幅512×512、8比特/象素的图像为实验对象,计算重建后的PSNR。-Programming based on 8 × 8 sub-block of the DCT image transform, quantization matrix based on the JPEG quantization and anti-quantitative, based on the 8 × 8
gaijinban
- 基于JPEG的图像编码 用于MPEG-2帧内编码部分 具有良好的PSNR-JPEG image coding based on MPEG-2 intra coding for some good PSNR
Compression
- Calculate the Mean Square Error (MSE) and the Peak Signal to Noise Ratio (PSNR) for different JPEG compression ratios.
jpeg-compress-code-
- 依据JPEG压缩标准的算法,对lena图像进行压缩,并恢复出原始图像,然后对照原始图像,对恢复出的图像进行客观评价:计算峰值信噪比PSNR及均方误差MSE。-language matlab jpeg picture compress
dctwm
- This program does watermarking in dct coefficints.Robust againt jpeg compression and noise.Evaluated with psnr
jpegprotected
- clc img = imread( lena.bmp ) JPEG compression jpegcompression(img, lena_compressed.mat ) JPEG decompression Irec = jpegrestoration( lena_compressed.mat ) System performances [CR,BPP,PSNR,MSE,SNR] = systemperformances(img,Ir
A-Watermarking-Algorithm(MATLAB)--
- 盲水印提取时不需要参考原始载体图像,在信息隐藏、版权保护等方面具有更广泛的应用前景。提出的盲水印算法在分块离散余弦变换(DCT)和离散小波变换(DWT)的基础上,利用关系双方DCT系数和DWT系数在受到攻击时具有相同变化趋势的特点,采用关系嵌入和量化嵌入的自适应选择嵌入策略,较大幅度地提高了盲水印提取的鲁棒性。同时在量化嵌入中采用抖动调制,实现了水印透明性和鲁棒性调节的便捷性。大量仿真实验结果表明该算法对噪声干扰、低通滤波、JPEG压缩、对比度增强等攻击有很好的鲁棒性和透明性。关键词 数字水印盲
jpeg
- 本程序采用JPEG算法对静止图像进行编解码,采用Matlab仿真平台。程序的品质因数可以自行调整,并附有性能参数分析(采用PSNR作为评判依据)。这是我研一的课程作业程序,自己写的,希望有需要的同学下载!-This procedure uses the JPEG algorithm for still image coding and decoding, using Matlab simulation platform. Program can adjust the quality factor
JPEG_Codec
- This a JPEG codec with AC/DC Huffman entropy coding, 4:2:0 Sampling, RGB/YCbCr converter. 2D-DCT and Quantization is included in the JPEG_Main. There also a Huffman table list in .txt, two sample testing picture and the bitrate-PSNR , Compressi