Fill Holes in a Binary Image without using imfill()

Develop a Matlab GUI that allows the users to fill holes in the binary image by clicking inside the hole with mouse.

Following are specific requirements:

• Your GUI must provide a button that allows the user to browse and select a binary image, and then show the selected binary image on axes.
• When the user clicks inside the image on GUI, you must use the position of mouse click as the starting point to implement the ‘Hole Filling’ algorithm discussed in class.
• You can use function ginput to read x and y coordinates of mouse click.
• You can use function imdilate to implement the morphological dilation operation.
• You can use function imcomplement to find the complement of a binary image.
• You must show the result image (with filled hole) on GUI.
• You can use the images provided with the assignment to test your algorithm.

Answer 1

[Image Analyst]

OK. Good luck. I'm confident you can do it. I don't believe imdilate() or imcomplement() will be needed. For the current pixel you're on, simply set it's value to true.

% Get initial point that user clicked on.
[x, y] = ginput(1);
row = y;
col = x;
if binaryImage(row, col)
    % If they clicked on part of the image that is already filled, warn them.
    warningMessage = sprintf('Please click on a black hole, not a white blob!');
    uiwait(warndlg(warningMessage))
    return;
end
% Now enter the loop that is your algorithm to change row and col.
% Fill the pixel as row, column.
binaryImage(row, col) = true;

Just do your algorithm to change row and column.

VERY IMPORTANT: don't mixup (x,y) with (row, column). Matrices are indexed (row, column), NOT (x,y). If you want to use the x,y terminology you have to index your matrix as (y, x).

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