How can I crop next image in same size of previous but difference position.

Hi all

My purpose is get two matrix of image in same size

I'd like to crop 2 image in same size but difference position.

My method is crop first image and keep first image size as [m n]. Then, I'd live to crop second image in same size of [m n] but difference position. So i have tried

 "a=imcrop(image,[0 0 m n])"

but it just automatically crop and I can't fix certain position of x and y, because the object is difference position from origin point.

How can i control certain size of image crop but still move crop region on figure then we can choose where to crop it.

Answer 1

[Image Analyst]

Try this

message = sprintf('Click the upper left corner of the cropping box');
uiwait(msgbox(message));
[x, y] = ginput(1); % Ask user to click the upper left corner.
croppedImage = imcrop(currentImage, [x, y, m, n]);

Answer 2

[Biswajit Manna]

This code may solve your problem.

function [ I_crop ] = b_croprect( imageG )
%b_croprect Summary of this function goes here
%   Detailed explanation goes here
% input is an gray image
% output is an croped image

imshow(imageG);

h = imrect(gca, [50 50 511 511]); % create rectangle on the image

message = sprintf('Drag, set position of the rectangle cropping box and double click on the rectangle box');
uiwait(msgbox(message));

   position = wait(h); % get position

   I_crop = imcrop(imageG,position); % crop image

   message = sprintf('Image has been croped');
   msgbox(message);

end

Answer 3

[Walter Roberson]

a = imcrop(image, [X Y m n])

where X is the column and Y is the row of the lower-left corner of where you want the cropping to start, and m is the width and n is the height you want the cropped image to be.