CODEWITHSUNDEEP
imagematlabimage-processing
Suzan Cioc
Suzan Cioc

Reputation: 30107

Copy (draw) one image inside region of another image in Matlab?

Is it possible to copy (draw) one image into region of another in Matlab? I need not only copy a matrix part, but copy with interpolation, i.e. passing fraction coordinates.

Upvotes: 2

Views: 839

Answers (1)

Shai
Shai

Reputation: 114846

You can "blend" images using alpha channel (or fractional mask).
Suppose you have master the large image, region the smaller image to be blended into master and alpha a fractional mask (the same size as region), where alpha=0 indicates that the corresponding output pixel should be taken from master, and alpha=1 indicates a pixel to be taken from region (alpha can be fractional to indicate a blend).
I assume master, region and alpha has the same width and height, and are of type double.
Then

 >> blend = bsxfun( @times, master, 1-alpha) + bsxfun( @times, region, alpha )

Upvotes: 3

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