How to thin the image so as to make the thickness of the image to one pixel wide?

Question

Meghashree G 2016-2-17

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评论： Vijesh Soorya Rao 2018-8-22

Hello,i have an image and i want to thin that word image so as to make the thickness of each word to one-pixel wide to make the stroke width uniform.Please help me.

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Answer 1

Image Analyst 2016-2-17

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在 MATLAB Online 中打开

Try this

binaryImage = grayImage < 128;
% Remove small blobs;
binaryImage = bwareaopen(binaryImage, 500);
% Skeletonize
skeletonImage = bwmorph(binaryImage, 'skel', inf);

Make sure your image is actually gray scale, not color.

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Image Analyst 2016-2-17

编辑：Image Analyst 2016-2-17

在 MATLAB Online 中打开

That's the skeleton of a perfect rectangle. You didn't get your binary image correctly. Apparently the image was already binary, not gray scale. I downloaded it and found that out. Here, try this:

fullFileName = fullfile(pwd, 'will.png');
binaryImage = imread(fullFileName);
% Get the dimensions of the image.  
% numberOfColorBands should be = 1.
[rows, columns, numberOfColorChannels] = size(binaryImage);
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.
  binaryImage = binaryImage(:, :, 2); % Take green channel.
  binaryImage = binaryImage < 128;
end
% Display the image.
subplot(2, 2, 1);
imshow(binaryImage, []);
title('Original Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Invert it.
binaryImage = ~binaryImage;
% Remove small blobs;
binaryImage = bwareaopen(binaryImage, 500);
% Display the image.
subplot(2, 2, 2);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Skeletonize
skeletonImage = bwmorph(binaryImage, 'skel', inf);
% Display the image.
subplot(2, 2, 3);
imshow(skeletonImage, []);
title('Skeleton Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Stem Test', 'NumberTitle', 'Off')

Image Analyst 2016-2-24

在 MATLAB Online 中打开

It's this line that makes it one pixel wide:

skeletonImage = bwmorph(binaryImage, 'skel', inf);

To not remove small blobs, change the 500 to a smaller number, like 20 or 50 or whatever

binaryImage = bwareaopen(binaryImage, 20);

The number you input is the size of blobs, plus smaller ones, that it will throw away (remove).

Vijesh Soorya Rao 2018-8-22

Thank you :)

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Answer 2

Walter Roberson 2016-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/268550-how-to-thin-the-image-so-as-to-make-the-thickness-of-the-image-to-one-pixel-wide#answer_210140

bwareafilt to remove the speckles. bwmorph() to skeletonize.

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Meghashree G 2016-2-17

Sorry sir..I dint get you..how do i make the image thickness one pixel wide??please help me with the code.Thank you

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How to thin the image so as to make the thickness of the image to one pixel wide?

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How to thin the image so as to make the thickness of the image to one pixel wide?

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