I want to cut/crop an RGB image and paste it on different location in another image

Hi, I would like to cut an RGB image and then paste it on another RGB image at different location.

Answer 1

[Wan Ji]

I will show you how to copy Part of image A to a certain position of image B

clc;clear
A = imread('Lena.jpg');
A = imresize(A,[200,200]);
imshow(A)

B = uint8(ones(600,600,3)*255); % create an empty image to get the copy from A
figure(1); clf; imshow(B)
title('Empty white image: the target image')

% copy Part of image A to image B
copyLen = 160; copyWid = 120; 
copyPosAx = 11; copyPosAy = 31; % the pos coordinate

copyPosBx = 21; copyPosBy = 21;
% copy for the first time
B = imcopy(A, B, [copyPosAx, copyPosAy], [copyPosBx, copyPosBy], [copyLen, copyWid]);
figure(2); clf; imshow(B); title('After copy once')

copyPosBx = 201; copyPosBy = 201; % change the copy position of image B
% copy for the second time
B = imcopy(A, B, [copyPosAx, copyPosAy], [copyPosBx, copyPosBy], [copyLen, copyWid]); 
figure(3); clf; imshow(B); title('After copy twice')

copyPosBx = 391; copyPosBy = 301; % change the copy position of image B
% copy for the third time
B = imcopy(A, B, [copyPosAx, copyPosAy], [copyPosBx, copyPosBy], [copyLen, copyWid]); 
figure(4); clf; imshow(B); title('After copy third time')

The imcopy function is used for three times, after that, you can see how Lena's profile show in a white image with 3 times

Wish you like it.

[Jenifer NG]

I have an error with imcopy when my position is not interger number

Index in position 1 is invalid. Array indices must be positive integers or logical values.

Error in imcopy (line 13)

B(Bx, By, :) = A(Ax, Ay, :); % copy part if A to B