How to divide an image into upper and lower regions

How to divide an image into upper and lower regions and get those into separate variables, based on the centroid point, so that i need to compute the area, separately.

Answer 1

[KSSV]

I = imread('your image');   % read image 
Ibw = im2bw(I);            
Ilabel = bwlabel(Ibw);   
stat = regionprops(Ilabel,'centroid');   % get centroid 
imshow(I); hold on;
plot(stat.Centroid(1),stat.Centroid(2),'ro');

%%dive the image 
c = fix(stat.Centroid) ;
I1 = I(1:c(1),:,:) ;
I2 = I(c(1)+1:end,:,:) ;
figure ; imshow(I1) ; 
figure ; imshow(I2) ;

Answer 2

[Vandana Rajan]

Hi,

These links might be useful for you.

https://www.mathworks.com/help/images/examples/measuring-regions-in-grayscale-images.html

http://blogs.mathworks.com/steve/2007/08/31/intensity-weighted-centroids/