Re: [Mesa3d-users] Fastest way to grab pixel values in to memory (and file)

[tom f. <tf...@al...>]

Srimal Jayawardena <sr...@gm...> writes:
> Hi
> 
> > How complex is the image recognition algorithm?
>
> Well the function involves a matrix operations, calculating
> expected values, covariances etc and obtaining the minimum
> of the function values from the 100 frames.
> 
> Can GLSL calculate an arbitrary function like that?

In general, it's hard to get a GPU to perform an arbitrary algorithm.
That said, matrix operations are what a GPU was designed to do, and I
recommended GLSL because GPUs are exceptionally good at doing the types
of per-fragment operations that come up frequently in image processing.

> Any good pointers for me to get started?

  http://www.opengl.org/documentation/glsl/

the wikipedia page is a good meta starting point:

  http://en.wikipedia.org/wiki/GLSL

note the 'References'.  Some quick google searches turn up:

  http://gamma.cs.unc.edu/GPGP/lectures/imgproc.pdf
  http://www.cs.berkeley.edu/~kubitron/courses/cs252-F03/projects/reports/project12_report_ver2.pdf

-tom

> > You might consider implementing your algorithm in GLSL.
[snip]