How to make image background white?
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I have a binary image. I want to make the background white keeping the black straight lines intact.I mean those lines which intersecting image objects will remain intact. Picture has attached.
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Jeff E
2019-12-24
I would start by closing in small gaps to get a solid hand.
imgin_close = imclose(imgin, strel('square', 3));
Then I would find the overlap between that solid hand, and the inverse of the original image, leaving me with just white lines on a black background. You may have some additional noise around the edges of the hand. The could be filtered out with something like bwareaopen, depending on your application.
imgin_lines = imgin_close & ~imgin;
imgin_lines = bwareaopen(imgin_lines, 3);
I would then take the inverse of that image to get just the black lines.
imgout = ~imgin_lines;
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Zara Khan
2019-12-25
Image Analyst
2019-12-25
This is what his code gives for me:
imgin = imread('image.png');
subplot(2, 3, 1);
imshow(imgin);
% Make a binary image
if ~isa(imgin, 'logical')
imgin = imgin(:, :, 1) > 128;
end
imgin_close = imclose(imgin, strel('square', 3));
subplot(2, 3, 2);
imshow(imgin_close);
imgin_lines = imgin_close & ~imgin;
subplot(2, 3, 3);
imshow(imgin_lines);
imgin_lines = bwareaopen(imgin_lines, 3);
subplot(2, 3, 4);
imshow(imgin_lines);
% I would then take the inverse of that image to get just the black lines.
imgout = ~imgin_lines;
subplot(2, 3, 5);
imshow(imgout);
Zara Khan
2019-12-26
Image Analyst
2019-12-26
Zara, I'm not sure what your question means. What do you want to give black lines "to"? What other colours are there that should receive/get black lines?
Or do you mean "how can I display the black lines in a variety of colors?" If that is what you mean, then label the lines-only image and call label2rgb().
% Label each line with a unique ID number.
labeledImage = bwlabel(imgin_lines)
% Let's assign each blob a different color to visually show the user the distinct blobs.
coloredLabels = label2rgb (labeledImage, 'hsv', 'k', 'shuffle'); % pseudo random color labels
% coloredLabels is an RGB image. We could have applied a colormap instead (but only with R2014b and later)
imshow(coloredLabels);
Zara Khan
2019-12-28
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