slicing image by histogram

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Tarik Razak
Tarik Razak on 10 Feb 2012
Hi I have image of connected text I was trying to use histogram vlues to segment it/slice it. Basicaly im=imread('test.jpg') 1. take histogram of the test image 2. slice/segment the image wherever the value of histogram is below certain number what would be the best way to do that? thanks

Answers (2)

Image Analyst
Image Analyst on 10 Feb 2012
See my BlobsDemo tutorial on this topic:
Basically
binaryImage = grayImage >= lowThreshold & grayImage <= HighThreshold;
labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'all');
You supply values for lowThreshold and highThreshold of course.

Tarik Razak
Tarik Razak on 10 Feb 2012
when i read grayImage=imread('image.jpg') and use the above code i get the error ??? Undefined function or method 'regionpropos' for input arguments of type 'double'.
Did i read it in wrong format? thanks
  1 Comment
Image Analyst
Image Analyst on 11 Feb 2012
regionpropos() is not a function. Try regionprops() like I suggested. ALso make sure your image is grayscale:
[rows columns numberOfColorChannels] = size(grayImage);
if numberOfColorChannels > 1
grayImage = grayImage(:,:,2); % Take green channel only
% grayImage = rgb2gray(grayImage); % Alternative, weighted average of RG&B
end

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