How to make image background white?

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Zara Khan 2019-12-24

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评论： Zara Khan 2019-12-28

image.png

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

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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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Image Analyst 2019-12-26

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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);