How can imfill a objects when they are in the edges of main image?

Question

Mohammed Alammar 2019-11-26

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编辑： Image Analyst 2020-11-24

hi,

I have Two rectangles 200X300 and 300X100 in the edges as shown below. I need to imfill in side the objects edge shape only. I have try use the regular imfill but doesn't work with me. Could you please help me??

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KALYAN ACHARJYA 2019-11-26

编辑：KALYAN ACHARJYA 2019-11-26

Please share the complete code, which generates attached figure.

Mohammed Alammar 2019-11-26

yes sir, I want to fill the objects to be white.

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Answer 1

Image Analyst 2019-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/493301-how-can-imfill-a-objects-when-they-are-in-the-edges-of-main-image#answer_403432

编辑：Image Analyst 2020-11-24

在 MATLAB Online 中打开

Close the contours then fill. Assuming the lines reach the edge lines:

% Make top line white:
col1 = find(binaryImage(1, :), 1, 'first')
col2 = find(binaryImage(1, :), 1, 'last')
binaryImage(1, col1:col2) = true;
% Make bottom line white:
col1 = find(binaryImage(end, :), 1, 'first')
col2 = find(binaryImage(end, :), 1, 'last')
binaryImage(end, col1:col2) = true;
% Make right line white:
row1 = find(binaryImage(:, end), 1, 'first')
row2 = find(binaryImage(:, end), 1, 'last')
binaryImage(row1:row2, end) = true;
binaryImage = imfill(binaryImage, 'holes');

If the lines don't reach the edges, then you'd need to use bwmorph() to find endpoints, then use bwlabel() to identify separate/distinct blobs, then construct a line between the two end points of each blob using polyfit(). Then write those lines into the image, then finally call imfill(). This is a more complicated algorithm but certainly doable in a few lines of code.

Post your original image (not a screenshot) if you still have trouble.

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Santiago Acosta 2020-11-24

Thank you for the clear answer Image Analyst, it's really helpful!! However, I should note that the function imfind seems to not exist anymore (if it ever did), find( ) works just as well.

Image Analyst 2020-11-24

Santiago: Sorry, I must have gotten confused. There never was an imfind(). It should be find(). I must just be used to putting im in front because so many of the Image Processing Toolbox functions have im in front of them. Thanks for the catch and I'll make the correction.

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Answer 2

KALYAN ACHARJYA 2019-11-26

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编辑：KALYAN ACHARJYA 2019-11-26

Its because of white area touches the border. Apply imclearborder on binary image, then only apply imfill

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Answer 3

Turlough Hughes 2019-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/493301-how-can-imfill-a-objects-when-they-are-in-the-edges-of-main-image#answer_403436

在 MATLAB Online 中打开

You could put a border on the image with value 1, then run the filter and remove the border to get original dimensions:

I=padarray(testiamge,[1 1],1,'both');
test=edge(I,'canny');
outputs = imfill(test,'holes');
outputs([1 end],:)=[]; outputs(:,[1 end])=[];
imshow(outputs)

Also, this might also be an option depending on your requirements:

outputs=~testimage;