How to find the variance of an image?

Question

sachin 2014-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/154471-how-to-find-the-variance-of-an-image

评论： Image Analyst 2018-3-25

采纳的回答： David Young

i try to find the variance by var function but it shoew the error. I = imread('eight.tif'); var(I)

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Answer 1

David Young 2014-9-12

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在 MATLAB Online 中打开

var requires a double or single argument. This will work:

img = double(imread('eight.tif'));
v = var(img);

But note that will give a vector, with one value for the variance of each column of the image. To get the variance of all the pixels in the image, you'll need

v = var(img(:));

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Answer 2

Dheeraj Kuamr Gupta 2017-4-2

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close all; clear all; clc; I = imread('C:\Users\anubh\Pictures\koala.jpg'); A=rgb2gray(I); [r,c]=size(A) b=r*c; s=0; s=sum(sum(A)); mean=a/b; display(mean); d=(A- mean); display(d);