How to do the segmentation of a tree leaf?

How to remove the background of the attached image and take only the leaf for training purpose using MATLAB? Thanks.

Answer 1

[Image Analyst]

OK, try this. Let me know if it doesn't meet your needs and why.

% Mask a leaf out of an RGB image.
clc;    % Clear the command window.
clear all;
close all;
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 24;

%===============================================================================
% Read in leaf color demo image.
folder = pwd
baseFileName = 'leaf.jpg';
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
if ~exist(fullFileName, 'file')
  % Didn't find it there.  Check the search path for it.
  fullFileName = baseFileName; % No path this time.
  if ~exist(fullFileName, 'file')
    % Still didn't find it.  Alert user.
    errorMessage = sprintf('Error: %s does not exist.', fullFileName);
    uiwait(warndlg(errorMessage));
    return;
  end
end
rgbImage = imread(fullFileName);
% Get the dimensions of the image.  numberOfColorBands should be = 3.
[rows, columns, numberOfColorChannels] = size(rgbImage);
% Display the original color image.
subplot(2, 2, 1);
imshow(rgbImage);
title('Original Color Image', 'FontSize', fontSize, 'Interpreter', 'None');
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'Outerposition', [0, 0, 1, 1]);

% Extract the individual red, green, and blue color channels.
% redChannel = rgbImage(:, :, 1);
% greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

% Create a mask of the background only.
mask = blueChannel > 200;
% Display the mask image.
subplot(2, 2, 2);
imshow(mask);
title('Mask Image', 'FontSize', fontSize, 'Interpreter', 'None');

% Mask out the leaf, leaving only the background.
% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
% Display the mask image.
subplot(2, 2, 3);
imshow(maskedRgbImage);
title('Background-Only Image', 'FontSize', fontSize, 'Interpreter', 'None');

% Mask out the background, leaving only the leaf.
% Mask the image using bsxfun() function
maskedRgbImage = bsxfun(@times, rgbImage, cast(~mask, 'like', rgbImage));
% Display the mask image.
subplot(2, 2, 4);
imshow(maskedRgbImage);
title('Leaf-Only Image', 'FontSize', fontSize, 'Interpreter', 'None');

[Hasith Magage]

Thanks for the nice answer. I got it done. But I got a little issue can you please help me to figure that out too.

I'll attach the image. I need to remove the little background pieces (white dots) which are in this image.

[Image Analyst]

After you create the mask, do this:

mask = bwareafilt(mask, 1); % Take largest blob.

[Hasith Magage]

thank you very much. really appreciate your help.

Answer 2

[Image Analyst]

Try the "Color Thresholder" app on the "Apps" tab of the tool ribbon. There are several color spaces that would work for this image:

Answer 3

[Image Analyst]

This is asked frequently for some reason. Just search on leaf and look for answers with code: http://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22leaf%22