Processing time of the code (Image analysis, image transformation)

Hi all matlab geeks out there,

I have a code for transformation of imagethat involves translation and rotation of image, since the number of data points are 15 million, I needed to grip the image first, however my current code has a a processing time of over 20 days, I am pretty sure something is wrong the way ive written my code can any help out ?I've attached the code in pdf file. THANKS MUCH

[Image Analyst]

Attach the m-file so we can run it ourselves. And explain what it means to " grip the image".

[Ripul Dutt]

Sorry my bad, it's "grid". PFA the m file. THANKS!!

[Image Analyst]

OK, now explain what it means to "grid the image". I don't know how to help you out with gridding the image because I don't know what that means to you. Do you think "gridding the image" will shorten the analysis time, which I think is your main problem you need fixed?

[Ripul Dutt]

Hey, thanks for your reply. So, essentially the image was taken from a LiDAR which at the given resolution collected millions of points, each point has an associated x,y,z,r,g,b value. Before doing the translation of image I want to grid it, by gridding I mean I have decided to divided the entire image into 5mmX5mm blocks and then I have taken a median value for x,y,z,r,g,b falling in a given 5mmX5mm grid, so that for each grid I only have one representative point, by doing so I will be able to open that gridded image in matlab and then perform tranformation (translation,rotation). It it this gridding part of the code that is taking too muct too long to process. Please let me know what you think

[Image Analyst]

Take a look at scatteredInterpolant() or griddedInterpolant() to turn your list of xyz coordinates and colors into a rectangular image.

[Ripul Dutt]

thanks, but I do need to grid the coordinates before I can do that, and they don't seem to process soon enough, I am thinking of giving some more time to improving the code to make processing faster before having it run at a super computer but i dont think that would be necessary, any suggestions ?