How can I extract a part of an image?

Hey, I'm new in Matlab and I'm working on mammograms, I need to extract the central region of the image and then calculate a few things. I don't know how to do this...Can you please help me with some code..

[Amrutha Kedarisetty]

did u got the results if yes pls help me

[Image Analyst]

I doubt they've been trying to get it working for the past 4 years but since it was so long ago, they might not answer you and you'd be better off starting your own question and attaching the image and indicate what part you want to "extract" and what the "few things" are. In the meantime, see the Image Segmentation Tutorial in my File Exchange

Image Analyst's File Exchange

Answer 1

[KSSV]

Read aboit imcrop.

http://in.mathworks.com/help/images/ref/imcrop.html

Answer 2

[Image Analyst]

Some useful demos are in my File Exchange. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

Or else post your image and some specific question.

[Archana Sr]

Can i get a matlab code for finding the area perimeter and eccentricity of a binary image

[Image Analyst]

Yes, my Image Segmentation Tutorial does that. If it doesn't, then ask it for the Area, Perimeter, and Eccentricity.

props = regionprops('table', mask, 'Area', 'Perimeter', 'Eccentricity');

[Archana Sr]

I don't get it

[Archana Sr]

Showing error like, Error in using regionprops expected input number 2,L to be one of these type etc..

[Image Analyst]

This works fine:

% Read in mask image.
mask = imread('image.bmp');
mask = mask(:, :, 1) > 0; % Convert to logical/binary
% Display it.
hFig = figure;
subplot(2, 1, 1);
imshow(mask);
hold on;
hFig.WindowState = 'maximized';
% Make measurements
props = regionprops('table', mask, 'Area', 'Perimeter', 'Eccentricity')

props =

2×3 table

Area Eccentricity Perimeter

______ _________________ _________

302517 0.742397889745183 3425.716

171557 0.755030557816219 3159.85

If it doesn't work for you, what version do you have? If you have an old version, try getting rid of the 'table' option and try again.