How to fix this error if my image is not two dimensional?

handclah = imread('hand2.jpg');
handclahe = adapthisteq(handclah, 'clipLimit', 0.02, 'Distribution', 'rayleigh');
figure, imshow (handclah);
figure, imshow (handclahe);

The error is shown below:

Error using adapthisteq

Expected input number 1, I, to be two-dimensional.

Error in adapthisteq>parseInputs (line 416)

validateattributes(I, {'uint8', 'uint16', 'double', 'int16', 'single'}, ...

Error in adapthisteq (line 155)

noPadRect, distribution, alpha, int16ClassChange] = parseInputs(varargin{:});

Answer 1

[Image Analyst]

You're using it on a color image and you can't do that. It needs a gray scale image. To fix:

handclah = imread('hand2.jpg');
[rows, columns, numberOfColorChannels] = size(handclah)
if numberOfColorChannels == 3
    % If it's color, convert it to gray scale.
    handclah = rgb2gray(handclah);
end
handclahe = adapthisteq(handclah, 'clipLimit', 0.02, 'Distribution', 'rayleigh');
subplot(2, 1, 1);
imshow (handclah);
subplot(2, 1, 2);
imshow (handclahe);

[Atifah Samuri]

This really works. Thank you.

[Atifah Samuri]

Btw, sir. Can I ask what this is for?

[rows, columns, numberOfColorChannels] = size(handclah);

if numberOfColorChannels == 3

[Image Analyst]

@Atifah Samuri it gets the dimensions of the image. Your error message said

Error using adapthisteq

Expected input number 1, I, to be two-dimensional.

So that indicates that you sent in a three dimensional image (color), not a 2-D image (gray scale) into adapthisteq(). We need a gray scale image for adapthisteq(), but the number of color channels in your image is 3, so it's RGB Color, not gray scale. So in that case the next line converts it to gray scale.

[Atifah Samuri]

I see. Thank you sir.

[Image Analyst]

That will solve the error you had, so could you click the "Accept this answer" link for my Answer? Thanks in advance.

Answer 2

[Yusuf Suer Erdem]

Hello, I used these codes below and it worked for me. Could you try it too? I only used .tif format image instead of .jpg image. I upload my image for you too.

clc; clear; close all;

I = imread('tire.tif');
J = adapthisteq(I,'clipLimit',0.02,'Distribution','rayleigh');
imshowpair(I,J,'montage');
title('Original Image (left) and Contrast Enhanced Image (right)')

[Atifah Samuri]

Thanks sir.