How to resolve this error "Error using histeq Expected input number 1, I, to be two-dimensional. Error in histeq (line 69), validateattributes(a,{'uint8','uint16','double','int16','single'}, ... Error in (line 3)" ?

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ARUN V 2018-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/388180-how-to-resolve-this-error-error-using-histeq-expected-input-number-1-i-to-be-two-dimensional-er

评论： DGM 2023-11-27

clc;
clear all;
g=histeq(imread('img.tiff'));
r=histeq(imread('img1.tiff'));
nir=histeq(imread('img2.tiff'));
figure;
imshow(g);

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ARUN V 2018-3-14

uint8

Mira mosad 2022-3-25

Check your image if the image is 3D convert it to 2D . Bu using this function Image = im2gray(Image);

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回答（1 个）

KALYAN ACHARJYA 2018-3-14

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https://ww2.mathworks.cn/matlabcentral/answers/388180-how-to-resolve-this-error-error-using-histeq-expected-input-number-1-i-to-be-two-dimensional-er#answer_310008

编辑：KALYAN ACHARJYA 2018-3-14

在 MATLAB Online 中打开

First Convert 'img.tiff' into a gray level then only apply the histeq.

g=histeq(rgb2gray(imread('img.tiff')));

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DGM 2023-11-27

Note that as of R2017a, histeq() supports N-D inputs, so this specific error shouldn't be seen when feeding histeq() an RGB image anymore.

That said, it's still worth asking whether it's appropriate or intended to be operating on the channels of an RGB image independently -- or whether it's appropriate to assume any particular 3-channel image is RGB.

The answer depends on the images and the intent. Given the variable naming, I have to wonder if these were in fact not normal RGB images. Just a thought.

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