MATLAB: How to calculate the inter-band average image.

Image Processing Toolboxinter-band average

i am new to matlab, help me?

How to calculate the inter-band average image.

Best Answer

If you have your RGB image in a MxNx3 matrix, you can use

 I = im2double(imread('peppers.png')); % sample image
    % make sure I is double
 Ibar = mean(I, 3);

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MATLAB: What is wrong with the following piece of code? Im trying to detect light and dark green vegetation. It just displays a black empty image

Your Image1 has been produced by im2double() so the range of Image1 is 0 to 1. But your second set of code has

Green = Image1 (i, j, 2) + 20;

so Green is going to be in the range (20+0) to (20+1), which is always going to be greater than the 0 to 1 entries already in Image1, so your "if" is always going to be true.

Note that your second block of code, involving "Green" is going to completely overwrite the output of the first block of code. Your first block might as well not be there.

Your first block could be rewritten without loops as

mask = Image1(:,:,2) > Image1(:,:,1) & Image1(:,:,2) > Image1(:,:,3);
Image2 = Image1 .* mask(:,:,[1 1 1]);

and your second block could be rewritten without loops as

mask = Image1(:,:,2) + 20 > Image1(:,:,1) & Image1(:,:,2) + 20 > Image1(:,:,3);
Image2 = Image1 .* mask(:,:,[1 1 1]);

MATLAB: How to calculate a digital value of a band in hyperspectral image

I = imread('landsat.jpg') ;
R = I(:,:,1) ;
G = I(:,:,2) ;
B = I(:,:,3) ;

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MATLAB: What is wrong with the following piece of code? Im trying to detect light and dark green vegetation. It just displays a black empty image

MATLAB: How to calculate a digital value of a band in hyperspectral image

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