How to do a binarization of this image?

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Veronika
Veronika 2016-9-8
评论： Veronika 2016-9-10
Dear all,
Please, can anybody tell me, how to do a binarization of this image?
Step by step please, I´m new in this section.
Thank you for your answers.

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采纳的回答

Image Analyst
Image Analyst 2016-9-9
You can threshold, like
grayImage = rgb2gray(yourRGBImage);
binaryImage = grayImage > someThresholdValue;
imshow(binaryImage);
Or see my interactive thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
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Image Analyst
Image Analyst 2016-9-9
You need to pass it a numerical array, not a character array (the filename string). imshow() can work like that but not rgb2gray. Try
grayImage = imread('thorax-mdl.jpg');
% Get the dimensions of the image.
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
% It's not really gray scale like we expected - it's color.
% Convert it to gray scale by taking only the green channel.
grayImage = grayImage(:, :, 2); % Take green channel.
end

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更多回答（1 个）

George
George 2016-9-8
Take a look at this example and im2bw.
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George
George 2016-9-8
It's saying that your image isn't grayscale. Take a look at this example.
Image Analyst
Image Analyst 2016-9-9
Then why did you accept the answer if it's not working?

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