I have a centroid(x,y) of object in image..How to extract patch from image around centroid

Hi, There are objects( nucleus) in an image.i have the centre(x,y) values of objects ...I want to extract patches from image around the center...The patch center will be the center(x,y) of object. Please help.

Answer 1

[Image Analyst]

subImage = grayImage(row1:row2, column1:column2);

or you can use imcrop().

[Tahir]

I want to extract patch of 80 by 80.. i am sorry

 forgot to mention this in question...I am also attaching patch...problem is that the object center is not patch center.

[Image Analyst]

My answer is the same. Don't you know the starting and ending rows and columns of that patch?

[Tahir]

No i just know the centroid co-ordinates... centre(x,y) value.

[Image Analyst]

Then use simple math

row1 = int32(y - 40);
row2 = row1 + 79;
column1 = int32(x - 40);
column2 = column1 + 79;
subImage = rgbImage(row1:row2, column1:column2, :);