why am I getting an error for this tutorial when adapted to my image? how can I fix this error:

Question

Neo 2022-12-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1884747-why-am-i-getting-an-error-for-this-tutorial-when-adapted-to-my-image-how-can-i-fix-this-error

评论： Walter Roberson 2022-12-26

采纳的回答： Karim

clc; % Clear command window.

clear; % Delete all variables.

close all; % Close all figure windows except those created by imtool.

% imtool close all; % Close all figure windows created by imtool.

workspace; % Make sure the workspace panel is showing.

lab_fabric = rgb2lab('image.tif');

a = lab_fabric(:,:,2);

b = lab_fabric(:,:,3);

color_markers = zeros([nColors, 2]);

for count = 1:nColors

color_markers(count,1) = mean2(a(sample_regions(:,:,count)));

color_markers(count,2) = mean2(b(sample_regions(:,:,count)));

end

color_labels = 0:nColors-1;

a = double(a);

b = double(b);

distance = zeros([size(a), nColors]);

for count = 1:nColors

distance(:,:,count) = ( (a - color_markers(count,1)).^2 + ...

(b - color_markers(count,2)).^2 ).^0.5;

end

[~,label] = min(distance,[],3);

label = color_labels(label);

clear distance;

rgb_label = repmat(label,[1 1 3]);

segmented_images = zeros([size(fabric), nColors],'uint8');

for count = 1:nColors

color = fabric;

color(rgb_label ~= color_labels(count)) = 0;

segmented_images(:,:,:,count) = color;

end

montage({segmented_images(:,:,:,2),segmented_images(:,:,:,3) ...

segmented_images(:,:,:,4),segmented_images(:,:,:,5) ...

segmented_images(:,:,:,6),segmented_images(:,:,:,1)});

title("Montage of Red, Green, Purple, Magenta, and Yellow Objects, and Background")

error:

Error using rgb2lab

Expected input number 1, RGB, to be one of these types:

single, double, uint8, uint16

Error in rgb2lab (line 56)

validateattributes(rgb, ...

Error in test (line 7)

lab_fabric = rgb2lab('image.tif');

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Answer 1

Karim 2022-12-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1884747-why-am-i-getting-an-error-for-this-tutorial-when-adapted-to-my-image-how-can-i-fix-this-error#answer_1136597

Assuming you are reffering to this tutorial: Color-Based Segmentation Using the L*a*b* Color Space - MATLAB & Simulink Example - MathWorks Benelux

Then you forgot to import the image, start with the imread function to read the image and then call rgb2lab

fabric = imread('fabric.png');
lab_fabric = rgb2lab(fabric);

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Walter Roberson 2022-12-26

Very few image related functions accept file names. imread() does if course, and imshow() does as well. I seem to recall that one of the image montage functions accepts file names. Some of the image information functions as well. But for anything other than imread you should always check the documentation to be sure that it accepts file names. It is safer to assume that most functions require that you pass in image data rather than file names.

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