How to use imfill() function to fill the interior of the boundary surface using Matlab?

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M.S. Khan
M.S. Khan on 11 Mar 2021
Commented: M.S. Khan on 20 Mar 2021
Hi dear community members,
i am using flood fill operation to fill the interior. i have closed the boundary surface. There are no holes on the boundary surface but still, the interior cannot be filled.
I am using the following code. Please guide me where i am making mistake. The matrix A as a text file is already attached.
interior_filled = imfill(A,'holes')
  1 Comment
M.S. Khan
M.S. Khan on 12 Mar 2021
Is the imfill() function is not capable to fill the interior region? How come, boundary surface is closed and imfill() function is not applicable?

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Accepted Answer

Image Analyst
Image Analyst on 12 Mar 2021
@M.S. Khan, try this:
% Demo by Image Analyst, March, 2021.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 16;
fprintf('Beginning to run %s.m ...\n', mfilename);
grayImage = importdata('Boundary_closed_1s_3s.txt');
subplot(2, 1, 1);
imshow(grayImage, []);
axis('on', 'image');
% Create a binary image.
binaryImage = grayImage ~= 0;
% Fill the object by scanning across all columns and
% drawing a line from the top-most pixel to the bottom-most pixel.
[rows, columns] = size(binaryImage);
for col = 1 : columns
% Find the top most pixel.
topRow = find(binaryImage(:, col), 1, 'first');
if ~isempty(topRow)
% If there is a pixel in this column, then find the lowest/bottom one.
bottomRow = find(binaryImage(:, col), 1, 'last');
% Fill from top to bottom.
binaryImage(topRow : bottomRow, col) = true;
interior_filled = binaryImage;
% interior_filled = imfill(binaryImage, 4, 'holes');
subplot(2, 1, 2);
imshow(binaryImage, []);
axis('on', 'image');
fprintf('Done running %s.m\n', mfilename);
M.S. Khan
M.S. Khan on 20 Mar 2021
i think, the 'P' should be changed with respect to the shape of the object. i am trying how to handle it.

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