Undefined function 'graythresh' for input arguments of type 'uint8'

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Johoon Kim
Johoon Kim 2015-2-12
评论： minseok kang 2022-5-16
img1=imread('Counting.jpg');
imshow(img1)
img1=rgb2gray(img1);
imshow(img1)
img2=im2bw(img1,graythresh(img1));
imshow(img2)
img2=~img2;
imshow(img2)
B = bwboundaries(img2);
imshow(img2)
text(10,10,strcat('\color{green}Objects Found:',num2str(length(B))))
hold on
for k = 1:length(B)
boundary = B{k};
plot(boundary(:,2), boundary(:,1), 'g', 'LineWidth', 0.2)
end
When I type this in, I get an error saying, "Undefined function 'graythresh' for input arguments of type 'uint8'
Does anybody know why? Help would be greatly appreciated.

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采纳的回答

Image Analyst
Image Analyst 2015-2-12
You do not have the Image Processing Toolbox installed. Type "ver" on the command line to see what toolboxes you have. imread() and rgb2gray() are both in base MATLAB so that is why you didn't see an error with them even though they were called prior to graythresh().

更多回答（1 个）

Bassel
Bassel 2016-2-24
Hello, I have the same problem. although i have installed the "Image Processing Toolbox"
It'll be great if you can help me.
kind regards Bassel
  2 个评论
Image Analyst
Image Analyst 2018-11-9
You may have it installed but don't have a license for it, for example you're in a pool of licenses and all the Image Processing licenses are checked out when you try to check one out. What does this show:
>> hasLicenseForToolbox = license('test', 'image_toolbox') % Check for Image Processing Toolbox.
hasLicenseForToolbox =
1
As you can see, you should see a 1 if there is a license available.

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