Re: [Boost-users] [gil] Constructing view from locator

Subject: Re: [Boost-users] [gil] Constructing view from locator
From: Sapp, Mark (Mark.Sapp_at_[hidden])
Date: 2011-11-16 17:05:22

Hi All

I realized the major performance issue was because I was building in
debug mode. I wasn't aware of the performance difference. It make sense
now that I know :). I'm not sure if that is documented somewhere but it
would be a good note at the beginning of the user guide.

>I'm not sure what 'fast enough' is, and without code samples it's hard
to say where a mistake might be made.  Traversing the image in a
cache-friendly manner is >usually the way to improve performance, but
I'm not sure that such a small image has a truly cache-unfriendly
traversal.

Fast enough means I need to process 1080p60 video in realtime and
1080p120 video in near realtime. I don't have specific performance
metrics of the code I've written yet, as I'm still working things out,
but I will keep you posted if interested.

>Subimage views are usually pretty simple -- does the usage example in
the following explain it?
>http://www.boost.org/doc/libs/1_44_0/libs/gil/doc/html/giltutorial.html
#OneDIteratorsSec

This specific code example was very helpful, I missed it when searching
the online documentation to answer this question.

I have some other unrelated [brief] questions I will send in a new
thread.

Thanks,
Mark
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