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

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??

[KALYAN ACHARJYA]

How you generated this image? imfill the shape with .....????

[Mohammed Alammar]

I have this test image

first I have used the edge detection as:

test_image_edges = edge(test_image, 'canny');

then ,

outputs = imfill(test_image_edges,'holes');

but dos not fill inside the edge detection

[KALYAN ACHARJYA]

Please share the complete code, which generates attached figure.

[Mohammed Alammar]

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

Answer 1

[Image Analyst]

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.

[Santiago Acosta]

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]

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.

Answer 2

[KALYAN ACHARJYA]

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

Similar Answer

Answer 3

[Turlough Hughes]

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;