How to fill inside of the object?

Question

fred grahambel 2015-7-6

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https://ww2.mathworks.cn/matlabcentral/answers/228710-how-to-fill-inside-of-the-object

评论： Jórdan Venâncio Leite 2020-3-11

Hello every one,

I have one hand image(binary), which after doing segmentation i got the image with edges and now i want to fill inside of the hand which can see in the second following image.

I used imfill but it didnt change anything.

I will appreciate if anyone can help me to do it.

thanks

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Rena Berman 2017-1-24

(Answers dev) Restored question.

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Answer 1

Image Analyst 2015-7-6

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在 MATLAB Online 中打开

You need to draw a line across the bottom to close off the arm before you fill it.

% Make tempoprary line.
binaryImage(end, :) = true;
% arm is sealed off.  Now we can fill.
binaryImage = imfill(binaryImage, 'holes');
% Erase temporary line.
binaryImage(end,:) = false;

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Image Analyst 2015-7-7

在 MATLAB Online 中打开

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 14;
binaryImage = imread('low.jpg');
[rows, columns, numberOfColorChannels] = size(binaryImage);
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Convert it to gray scale by taking only the green channel.
  binaryImage = binaryImage(:, :, 2); % Take green channel.
end
% Display the original gray scale image.
subplot(2, 2, 1);
imshow(binaryImage, []);
title('Original Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Crop image to get rid of white border.
binaryImage = binaryImage(33:585, 88:801) > 128;
subplot(2, 2, 2);
imshow(binaryImage, []);
title('Cropped Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Make temporary line.
binaryImage(end, :) = true;
% arm is sealed off. Now we can fill.
binaryImage = imfill(binaryImage, 'holes');
subplot(2, 2, 3);
% Erase temporary line.
binaryImage(end,:) = false;
imshow(binaryImage)
title('Filled Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');

If this works, you can officially "Accept this answer".

Image Analyst 2015-7-8

在 MATLAB Online 中打开

This seems to work fine. I'm just taking the whole image instead of cropping out the middle portion of it:

    clc;    % Clear the command window.
    close all;  % Close all figures (except those of imtool.)
    clear;  % Erase all existing variables. Or clearvars if you want.
    workspace;  % Make sure the workspace panel is showing.
    format long g;
    format compact;
    fontSize = 14;
    binaryImage = imread('IM.jpg');
     % Display the original color image.
    subplot(2, 2, 1);
    imshow(binaryImage, []);
    title('Original Color Image', 'FontSize', fontSize, 'Interpreter', 'None');
   [rows, columns, numberOfColorChannels] = size(binaryImage);
    if numberOfColorChannels > 1
      % It's not really gray scale like we expected - it's color.
      % Convert it to gray scale by taking only the green channel.
      binaryImage = binaryImage(:, :, 2); % Take green channel.
    end
    % Threshold gray scale image to make it binary.
    binaryImage = binaryImage > 128;
    subplot(2, 2, 2);
    imshow(binaryImage, []);
    title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
    % Make temporary line.
    binaryImage(end, :) = true;
    % arm is sealed off. Now we can fill.
    binaryImage = imfill(binaryImage, 'holes');
    subplot(2, 2, 3);
    % Erase temporary line.
    binaryImage(end,:) = false;
    imshow(binaryImage)
    title('Filled Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');

Image Analyst 2015-7-9

在 MATLAB Online 中打开

farhad:

See code below that starts with your grayscale image in your mat file:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
% Load "original" image.  Evidently it's not really the original.
s = load('grayscale.mat')
grayImage = s.IBWS;
% Display the original gray scale image.
subplot(2, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')
% Let's compute and display the histogram.
[pixelCount, grayLevels] = imhist(uint8(grayImage));
subplot(2, 2, 2);
bar(grayLevels, pixelCount); % Plot it as a bar chart.
grid on;
title('Histogram of original image', 'FontSize', fontSize, 'Interpreter', 'None');
xlabel('Gray Level', 'FontSize', fontSize);
ylabel('Pixel Count', 'FontSize', fontSize);
xlim([0 grayLevels(end)]); % Scale x axis manually.
% Threshold the image
binaryImage = grayImage > 20;
% Display the image.
subplot(2, 2, 3);
imshow(binaryImage, []);
title('Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Make temporary line.
binaryImage(end, :) = true;
% The arm is sealed off. Now we can fill.
binaryImage = imfill(binaryImage, 'holes');
% There are small noise blobs.  Extract the largest one.
binaryImage = bwareafilt(binaryImage, 1);
subplot(2, 2, 4);
% Erase temporary line.
binaryImage(end,:) = false;
% Display the image.
imshow(binaryImage)
title('Filled Binary Image', 'FontSize', fontSize, 'Interpreter', 'None');

Image Analyst 2015-7-9

You must have an old version of MATLAB where bwareafilt() had not been introduced yet. See my attached demo where you can use your version and use my function ExtractLargestNBlobs.

To smooth the boundary you can use imclose() or activecontour() (demo attached).

Image Analyst 2015-7-10

test3.m

Not sure what you did but it works just great with my ExtractNLargestBlobs() function. No problems whatsoever. Working code is attached.

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Answer 2

Jórdan Venâncio Leite 2020-2-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/228710-how-to-fill-inside-of-the-object#answer_417804

Hello ImageAnalyst! how to draw a line across the top of a figure as you did with the bottom side?

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Image Analyst 2020-3-4

编辑：Image Analyst 2020-3-4

在 MATLAB Online 中打开

Sometimes you need to save the line, then do your fill or whatever, then set it back:

% Save existing line:
originalLine = binaryImage(1, :);
% Make temporary line along the top of the image.
binaryImage(1, :) = true; % Set all of row 1 to true/white/1
% Now do some processing, such as imfill() or whatever...
% Finally restore original line:
binaryImage(1, :) = originalLine;