over lap image onto another image??

HI , im supposed to make a function

function [] = paste ( smallimage, bigimage, centerxy)

which returns the small image pasted onto the big image placed at [ x ,y] location center xy. the smallerimage is copied to overlay part of the big image, it will appear inside the bigimage and cover some of its pixels

I did not learn anything about copying and pasting images in class , and ive been searching the internet so much to find out how , but i cannot find any sites that teaches me how to do something like this

Do i do something like i=imread(smallimage) i=imcrop(i)

 and then i dont know what else to do , how would i paste it in the other picture matrix?
is there impaste( location , bigimage)? oh jeez ive spent 40 of the past 48 hours trying to figure out matlab

[Walter Roberson]

Are smallimage and bigimage the _file names_ of images, or are they the image matrices ? imread() would be used if you are being passed the file names, but not if you are being passed the data.

You are not likely to have a use for imcrop.

If the function definition must be the one shown, then you cannot return anything from that function, which disagrees with your written requirements.

[miskie]

smallimage and bigimage are the file names yes ,

so at the start of my function it would be like

i=imread(bigimage);

h=imread(smallimage);

....

then i dont know what i could do

impaste? imoverlap? like is there a built in function to overlay an image or something?:

Answer 1

[Brett Shoelson]

Consider:

a = magic(7)
b = rand(2,3)
a(3:4,4:6) = b

% Or, more generally,:

startrow = 3;
startcol = 4;

a(startrow:startrow+size(b,1)-1,startcol:startcol+size(b,2)-1) = b;

Cheers,

Brett

Answer 2

[Walter Roberson]

The result of reading in an image is a matrix. After your imread() you would have two matrices. You can copy one matrix to a particular place in another matrix.