MATLAB: How to leaf detection by sobel edge detection using matlab

Image Processing Toolboximage segmentationleaf

sobel edge detection

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Hi,

Could you elaborate on what you mean by leaf detection? Are you trying to do image segmentation? Here are a few resources which might be useful:

Edge Detection

Image Segmentation

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MATLAB: Edge detection with Sobel

I made a few improvements. This seems to work fine:

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 short g;
format compact;
fontSize = 15;
fprintf('Beginning to run %s.m ...\n', mfilename);
grayImage = imread('cameraman.tif');
subplot(2, 1, 1);
imshow(grayImage);
edg = edgy(grayImage);
subplot(2, 1, 2);
imshow(edg, []);
fprintf('Done running %s.m.\n', mfilename);
function edg = edgy(originalImage)
[rows, columns, numberOfColorChannels] = size(originalImage);
% Convert to gray scale if necessary
if numberOfColorChannels == 3
	originalImage = rgb2gray(originalImage);
end
C = double(originalImage);
Gx = zeros(rows, columns);
Gy = zeros(rows, columns);
for row = 1 : rows - 2
	for col = 1 : columns - 2
		%Sobel mask for x-direction:
		Gx=((2*C(row+2,col+1)+C(row+2,col)+C(row+2,col+2))-(2*C(row,col+1)+C(row,col)+C(row,col+2)));
		%Sobel mask for y-direction:
		Gy=((2*C(row+1,col+2)+C(row,col+2)+C(row+2,col+2))-(2*C(row+1,col)+C(row,col)+C(row+2,col)));
		
		%The gradient of the image
		%B(i,j)=abs(Gx)+abs(Gy);
		C(row,col)=sqrt(Gx.^2+Gy.^2);
	end
end
edg = C;
end

MATLAB: How to detect edge/contour of threshold image

https://www.mathworks.com/help/images/ref/bwboundaries.html

If you don't have the image processing toolbox, things get much more difficult.

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Related Solutions

MATLAB: Edge detection with Sobel

MATLAB: How to detect edge/contour of threshold image

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