Please Please help with centering and overlaying an image

I know this should be simple but I really cannot figure it out. How do I take two images and then have them display overlap each other at the central point (I have included a figure below)? These pictures are of different sizes. And I would like to do this without "hard-coding"

I have A = imread('A.png'); A = imread('B.png'); imshow (A) hold on; imshow (B)

But after this I have no idea how to center these :(

Answer 1

[Image Analyst]

Probably the easiest way is to copy and past the box at the proper location. You can easily find out the coordinates using the size function

[rows1, columns1, numberOfColorChannels1] = size(image1);
[rows2, columns2, numberOfColorChannels2] = size(image2);
col3 = int32(columns2/2 - columns1/2);
col4 = col3 + columns1 - 1;
row3 = int32(rows2/2 - rows1/2);
row4 = row3 + rows1 - 1;

Then paste in to each color channel. See my attached demo.

[MLnoob5340]

That's great but isn't that technically "hard coding" the pixels?

[Mohammad Abouali]

No, Image Analyst is reading your image sizes. So if your image sizes changes those numbers adjusts automatically. This is not hard-coding.

[Image Analyst]

It's not hard coding - it's adaptable to the sizes of your image. If you want manual/interactive, you can use ginput to specify a point to drop down the rectangle (like I showed in my demo), but you're not guaranteed to point to the exact middle . If you want the exact middle, you have to compute where that is .

[MLnoob5340]

Thank you very much! I am just confused on the definition of hard-coding--I'll look into it

[Image Analyst]

Well go ahead and mark it "Accepted" then. Thanks. Hard coding woul dbe where you specify the actual numerical coordinates, like

image2(200:300, 500:550) = image1;

It would always put it at those column and row locations and not adapt to the size of image1.