MATLAB: Shape features for the segments

Image Processing Toolboximage segmentation

hi i have to write a program for shape features for the segments with top 4 largest areas. and i dont know how to do this .

plz help me.

Best Answer

See my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

My function that extracts the N biggest or smallest blobs is included in the demo I attached below. Once you have the 4 largest regions you can then call regionprops to measure things in them like the area, perimeter, equivalent circular diameter, etc.

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MATLAB: Dividing speech signal into short-time segments

If your sound signal is a vector, try to use reshape. For example from the info I understand that your sound signal would be a vector with 72000 elements which you want to divide in groups of 150.

SeperatedSoundSignal = reshape(soundSignal,150,72000/150);

This will convert your vector into 72000/150 columns which have each 150 elements/samples.

Kind regards, Baltam

MATLAB: How to count blobs with a given threshold in an image

One possible solution would be like this:

% Read sample image
I = imread('coins.png');
% Threshold
th = 100;
% Blobs where I > th
BW = I > th;
% Count number of blobs
s = regionprops(BW);
numBlob = numel(s);

Result:

>> numBlob
numBlob =
  10

Best Answer

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MATLAB: Dividing speech signal into short-time segments

MATLAB: How to count blobs with a given threshold in an image

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