How to assign an image to another with a black frame?

Question

Edwin Joy 2019-3-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/447825-how-to-assign-an-image-to-another-with-a-black-frame

编辑： Edwin Joy 2019-3-2

I used the code given below to assign another picture to a black filled picture. The given picture has to fit into the black background at the center so that it looks as if it is framed.

But the result is:

I'd like the pic I loaded, (that is j) inside the box. I tried a lot! Please help! Many thanks in advance! :)

j=imread('1.jpg');
[na, nb, nc]=size(j);
b=40;
j_big=zeros(na+2*b, nb+2*b, nc);
j_big(b+1:b+na, b+1:b+nb, :)=j;
imshow(j_big);

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Answer 1

Image Analyst 2019-3-2

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https://ww2.mathworks.cn/matlabcentral/answers/447825-how-to-assign-an-image-to-another-with-a-black-frame#answer_363485

Why not just use padarray()?

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Edwin Joy 2019-3-2

编辑：Edwin Joy 2019-3-2

Oh okay. Thank you!

But I still don't understand why I just get some pixels scattered around the image when I use the code mentioned. I even tried to use loops and copy pixel by pixel to find out the error but it's still giving me the same result.

EDIT:

Yay! I got it. Well it appeared when I changed the array to unsigned int8.

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