% [mssim ssim_map] = ssim_index(img1, img2); % %Advanced Usage: % User defined parameters. For example % % K = [0.05 0.05]; % window = ones(8); % L = 100; % [mssim ssim_map] = ssim_index(img1, img2, K, window, L); ...
\alpha,\beta,\gamma分别代表了不同特征在SSIM衡量中的占比,当都为1时,有: $$ SSIM(x,y) = \frac{(2\mu_x\mu_y+C_1)(2\sigma_{xy}+C_2)}{(\mu_x^2+\mu_y^2+C_1)(\sigma_x^2+\sigma_y^2+C_2)} $$ SSIM的实践常用方法MSSIM (Mean SSIM) 实际上,当需要衡量一整张图片的质量,...
在这里,经过一些实验总结,我们把K1设为0.01,K2设为0.03,然后用平均SSIM指数作为整幅图像的估计质量评价: (14) 其中X,Y为图像, 为局部SSIM指数在映射中的位置,MN为局部窗口的数量。 四、matlab实现 function [mssim, ssim_map,siga_sq,sigb_sq] = SSIM(ima, imb) % === %ssim的算法主要参考如下论文: %...
结构相似性指数(structural similarity index,SSIM), 出自参考文献[1],用于度量两幅图像间的结构相似性。和被广泛采用的L2 loss不同,SSIM和人类的视觉系统(HVS)类似,对局部结构变化的感知敏感。 SSIM分为三个部分:照明度、对比度、结构,分别如下公式所示: 将上面三个式子汇总到一起就是SSIM: 其中,上式各符号分别...
The SSIM index map(SSIM as a function of location) is shown on the lower-right.Colorbar (Options II)has been selected in theViewdropdown menu. The other options areNo colorbar(grayscale image) andGrayscale colorbar.A grayscale SSIM map is shown in theMathworks description of SSIM, but ...
ssim http://en.wikipedia.org/wiki/Structural_similarity The structural similarity (SSIM) index is a method for measuring the similarity between two images. The SSIM index is a full reference metric; in other words, the measuring of image quality based on an initial uncompressed or distortion-fre...
结构相似指标（SSIM）是一种衡量图片失真程度或相似度的感知模型，它与MSE（均方误差）和PSNR（峰值信噪比）不同，更符合人眼的直观感受。在MSE下，不同SSIM值会呈现出不同的图片效果。SSIM值范围在[-1, 1]之间，具有对称性、边界性以及唯一最大性。当且仅当x和y相等时，SSIM等于1。SSIM主要考虑图片...
In this paper, we derive bounds on the structural similarity (SSIM) index as a function of quantization rate for fixed-rate uniform quantization of image discrete cosine transform (DCT) coefficients under the high-rate assumption. The space domainChannappayya...
GPU Based Image Quality Assessment using Structural Similarity (SSIM) Index: 10.4018/978-1-4666-8853-7.ch013: This chapter deals with performance analysis of CUDA implementation of an image quality assessment tool based on structural similarity index (SS
The structural similarity (SSIM) index is a method for measuring the similarity between two images. http://en.wikipedia.org/wiki/Structural_similarity - bytespider/ssim