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How to merge two images one over another?

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JAI PRAKASH
JAI PRAKASH 2018-7-3
评论： OCDER 2018-7-3
Note
1 both are RGB's
2 black area iscompletely black i.e., RGB value is 0
Right now I am doing this:
But I am not satisfied with performance, in terms of time it is taking.
Can there be more efficient way?
  2 个评论
Adam
Adam 2018-7-3
im_blank > 0
is going to produce a 3-element vector on an RGB image.
JAI PRAKASH
JAI PRAKASH 2018-7-3
Yes, you are right.
My approach is accurate, but consumes more time.

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采纳的回答

OCDER
OCDER 2018-7-3
I don't think you can go any faster at this point, unless zoom_image is a double. If so, then you can do
zoom_image = zoom_image.*(~mask) + imblank.*mask; % ~17% faster
When you reached the end of the code-based optimization, try parallel or GPU computing, or MEX/C++ to achieve faster speeds. I'm guessing GPU computing is the way to go since GPU is designed for image processing.
https://www.mathworks.com/discovery/matlab-gpu.html
  2 个评论
JAI PRAKASH
JAI PRAKASH 2018-7-3
Hey OCDER
Thanx
Can u guide me how to speed up using me c++. Not exactly on above problem but generally how to use mex c++ to speed up calculation.
OCDER
OCDER 2018-7-3
Ah, that took me a while to get used to and I'm still learning tricks. The general idea is to make a "gateway" function that links matlab to C++. I started with this tutorial and looked at the example codes that matlab has.
https://www.mathworks.com/help/matlab/matlab_external/standalone-example.html
It's a good investment as some of my codes have been sped up > 10 times, and GPU uses C language. When you get stuck on mex, ask us at the forum. The mvp's have more experience with mex coding.

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