How to zoom in the Image by ROI in MATLAB -

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i have 2 images. want see more detail in special region (roi). hence, draw red rectangular , zoom in original size (256 256) , display in second row below expected result. me solve in matlab? current code

 img1 = imread('peppers.png');  img2 = imread('coins.png');  img1=imresize(img1,[256 256]);  img2=imresize(img2,[256 256]);  %%draw rectangle  subplot(221);imshow(img1); rectangle('position',[100 50 20 20], 'linewidth',2, 'edgecolor','r');  subplot(222);imshow(img2);rectangle('position',[100 50 20 20], 'linewidth',2, 'edgecolor','r');  %% zoom in image

enter image description here

try (when images appears, use mouse select region of interest):

 img1 = imread('peppers.png');  img1=imresize(img1,[256 256]);   f=figure;  imshow(img1);  rect = getrect(f); %//select roi mouse  img1_roi = img1( rect(2) : (rect(2)+rect(4)) , rect(1) : (rect(1)+rect(3)) , : ); %//store roi in matrix   img2 = imread('coins.png');  img2= imresize(img2,[256 256]);    f=figure;  imshow(img2);  rect = getrect(f); %//select roi mouse  img2_roi = img2( rect(2) : (rect(2)+rect(4)) , rect(1) : (rect(1)+rect(3)) , : );  %//store roi in matrix   %//plot  subplot(2,2,1)  imshow(img1)  subplot(2,2,2)  imshow(img2)  subplot(2,2,3)  imshow(img1_roi)  subplot(2,2,4)  imshow(img2_roi)

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