
Reduce loss of quality when using imfill and imfuse
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I have to fill some regions of a black and white map, whose regions are black and are delimited by white borders.
This is the code
fill_regions = [ 128 58
280 80
335 292
430 430
470 475
525 525
550 655
680 610
770 380
785 480];
I = imread('https://i.imgur.com/4kWRWDV.png'); % black italy with white borders
BW = imbinarize(I,.1); % turn I into a black-white image...I had to use .1 threshold to prevent the filling of multiple adiacent regions
T = imread('https://i.imgur.com/1QY6Qw0.png'); % transparent italy, has only the borders
for i = 1:size(fill_regions,1)
BW = imfill(BW,fill_regions(i,:));
end
imshow( imfuse(BW,T,'diff') ); % add the erased borders to BW
saveas(gcf, 'test.png')
and here is a comparison between original image (left) and filled one (right)

as you can see, the filled image has poor quality (but also the original image has not the same quality as the source image...why this happens?).
Is there a way to preserve the same quality as the source image or, at least, to reduce the loss of quality?
2 Commenti
darova
il 21 Mag 2020
I saved your boundary image, it's poor quality. Look

You don't need for loop in this case, just imfill
I1 = imfill(BW,fill_regions);
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