结构相似性指标(structural similarity index,SSIM index)是一种用以衡量两张数位影像相似程度的指标。当两张影像其中一张为无失真影像,另一张为失真后的影像,二者的结构相似性可以看成是失真影像的影像品质衡量指标。相较于传统所使用的影像品质衡量指标,像是峰值信噪比(PSNR),结构相似性在影像品质的衡量上更能符合...
大多数的基于误差敏感度(error sensitivity)的质量评估方法(如MSE,PSNR)使用线性变换来分解图像信号,这不会涉及到相关性。我们要讨论的SSIM就是要找到更加直接的方法来比较失真图像和参考图像的结构。 二、SSIM指数 物体表面的亮度信息与照度和反射系数有关,且场景中的物体的结构与照度是独立的,反射系数与物体有关。...
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...
SSIM(structural similarity index),结构相似性,是一种衡量两幅图像相似度的指标。该指标首先由德州大学奥斯丁分校的图像和视频工程实验室(Laboratory for Image and Video Engineering)提出。SSIM使用的两张图像中,一张为未经压缩的无失真图像,另一张为失真后的图像。 可直接运行代码 ...
Introduction— The Structural Similarity Index (SSIM) is a perceptual metric that quantifies image quality degradation* caused by processing such as data compression or by losses in data transmission. It is a full reference metric that requires two images from the same image capture— a reference...
Introduction—TheStructural Similarity Index (SSIM)is a perceptual metric that quantifies image quality degradation* caused by processing such as data compression or by losses in data transmission. It is a full reference metric that requirestwoimages from the same image capture— a reference image ...
[ssimval,ssimmap] = ssim(A,ref)also returns the local SSIM value for each pixel inA. ___= ssim(A,ref,Name,Value)computes the SSIM, using name-value pairs to control aspects of the computation. Examples collapse all Calculate Structural Similarity Index (SSIM) ...
This MATLAB function calculates the structural similarity (SSIM) index for grayscale image or volume A using ref as the reference image or volume.
ssimval= ssim(A,ref,Name,Value)calculates the SSIM, using name-value pairs to control aspects of the computation. [ssimval,ssimmap] = ssim(___)also returns the local SSIM value for each pixel or voxel inA. collapse all Calculate Structural Similarity Index (SSIM) ...
指标结构相似性index结构相似相似指标构造相似性相似性 系统标签: similaritystructural相似性indexssimmse PresentedBy:BishwaShethStructuralSimilarityIndexGuidedBy:Dr.K.R.RaoTopicstobeCovered WhyImagequalitymeasure WhatisImagequalitymeasure Typesofqualityassessment MSE–Meansquareerror SSIM-Structuralsimilarityindexmethod ...