How to create an array and combine and put two images into it

Question

Yuan Yuan Lin 2020-11-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/645453-how-to-create-an-array-and-combine-and-put-two-images-into-it

评论： Setsuna Yuuki. 2020-11-13

采纳的回答： Setsuna Yuuki.

Hi.

So far, I have the following code:

A = imread('Yuan.jpg');

ACrop = A(300:1300, 300:1051);

imshow(ACrop)

B = imread('Jacky.jpg');

BCrop = B(1:225, 88:283);

imshow(BCrop)

I have two images cropped. I want to combine ACrop and BCrop together with ACrop on the left and BCrop on the left. How do I create an array so that I may combine two images into one in the array?

Thanks.

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Answer 1

Setsuna Yuuki. 2020-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/645453-how-to-create-an-array-and-combine-and-put-two-images-into-it#answer_542273

编辑：Setsuna Yuuki. 2020-11-12

在 MATLAB Online 中打开

Maybe you need to resize or add white pixels so that the images have the same dimension.

A = imread('Yuan.jpg');
ACrop = A(300:1300, 300:1051);
imshow(ACrop)
B = imread('Jacky.jpg');
BCrop = B(1:225, 88:283);
imshow(BCrop)
[qq,ww,ee] = size(Acrop); 
matrix = 255*uint8(ones(qq,ww,ee)); %Image with pixels in 255 (White)
[rr,tt,yy] = size(Bcrop);
matrix(1:rr,1:tt,:) = Bcrop(:,:,:); %add Bcrop to the white matrix
umi = [ACrop, matrix]; %concatenate
imshow(umi)
%or
umi = [ACrop;matrix]; %concatenate
imshow(umi)

with resize:

A = imread('Yuan.jpg');
ACrop = A(300:1300, 300:1051);
imshow(ACrop)
B = imread('Jacky.jpg');
BCrop = B(1:225, 88:283);
imshow(BCrop)
[qq,ww,ee] = size(Acrop); 
Bcrop = imresize(Bcrop,[qq ww]);
umi = [ACrop, Bcrop]; %concatenate
imshow(umi)
%or
umi = [ACrop;Bcrop]; %concatenate
imshow(umi)

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Yuan Yuan Lin 2020-11-13

[qq, ww, ee] = size(ACrop);

BCrop = imresize(BCrop, [qq, ww]);

final = [ACrop, BCrop];

The ee value is the channel that has been added. Tried adding ee to [qq, ww] for BCrop but the combined image is still black and white. final = [ACrop, BCrop, :]; doesn't seem to be the correct way of writing it. Any way to write it so that it retains its rgb?

Setsuna Yuuki. 2020-11-13

在 MATLAB Online 中打开

when you crop the image, you must do with 3 channels.

A = imread('Yuan.jpg');
ACrop = A(300:1300, 300:1051,:);% : --> 3 channels
imshow(ACrop)
B = imread('Jacky.jpg');
BCrop = B(1:225, 88:283,:); % : --> 3 channels
imshow(BCrop)
[qq,ww,~] = size(ACrop);
Bcrop = imresize(BCrop,[qq ww]);
umi = [ACrop, Bcrop]; %concatenate
imshow(umi)
%or
umi = [ACrop;Bcrop]; %concatenate
imshow(umi)