Why regionprops didn't work?

Hi all,

I want to use regionprops function to detect a hole inside a grayscale image I wrote this code:

I=imread('nameimg')
I=im2bw(I)
g=regionprops(I,'centroid')

Why this code make this error:"Too many input argument"??????

Thanks all

[John BG]

please make the image available by attaching it to your question

Answer 1

[Image Analyst]

Try this

grayImage = imread('nameimg.png');
% Get the dimensions of the image.  
% numberOfColorChannels should be = 1 for a gray scale image, and 3 for an RGB color image.
[rows, columns, numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
  % It's not really gray scale like we expected - it's color.
  % Use weighted sum of ALL channels to create a gray scale image.
  grayImage = rgb2gray(grayImage); 
  % ALTERNATE METHOD: Convert it to gray scale by taking only the green channel,
  % which in a typical snapshot will be the least noisy channel.
  % grayImage = grayImage(:, :, 2); % Take green channel.
end
% Display the image.
subplot(2, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image', 'FontSize', fontSize, 'Interpreter', 'None');

binaryImage = im2bw(grayImage);
[labeledImage, numBlobs] = bwlabel(grayImage);
props = regionprops(labeledImage,'Centroid')
allCentroids = [props.Centroid];
xCentroids = allCentroids(1:2:end);
yCentroids = allCentroids(2:2:end);

See my tutorial for a full demo: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[Andrea Vezzoli]

Thanks!!!!!!