croptectd image by user using imrect() functions

i am capturing infinite no of images from gige vision camera .The camera gives infinite no of screenshot that i converted RGB to binary images but i am not saving these screenshots but only show it.Now i want to crop a perticular region of interest will crop by user only one time by using imrect() and applying the cropted region for multiple live images,coming from camera .How it is possible by matlab? my code is

if true
   obj=videoinput('gige',1,'BayerBG8');  
set(obj,'SelectedSourceName','input1');
preview(obj);
Folder1='C:\MATLABS\Arka2';
for i=1:5
frame=getsnapshot(obj);
  im = rgb2gray(frame);
  frame1=imbinarize(im,.4);
imshow(frame1);
end
h_rect = imrect();
pos_rect = h_rect.getPosition();
pos_rect = round(pos_rect);
for i=1:5
img_cropped = frame1(pos_rect(2) + (0:pos_rect(4)), pos_rect(1) + (0:pos_rect(3)));
imshow(img_cropped);
imwrite(img_cropped, fullfile(Folder1, sprintf('%01d.jpg', i)));
end
end
but the problem is that the cropted position of last image is selected only and it prints 5 times.

[arkaprava mandal]

please help....