comp.lang.idl-pvwave archive: archive » Issues with read

Home » Public Forums » archive » Issues with read_png and/or profiler

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Issues with read_png and/or profiler [message #81000]

Wed, 25 July 2012 08:51

hugh.ramp
Messages: 4
Registered: July 2012

Junior Member

Hi all,

I'm running a fairly straight forward image correlation program, which should run fairly quickly (~O(n^4), I believe). However, the complexity seems to be rising much quicker than that, an 962x722 image with a 30x29 kernel takes ~16 hours (with profiler on), whereas a 640x480 image with the same kernel takes ~1.5 hours.

Using profiler to determine the source for the complexity, I found that the Time self(ms) for read_png() was ~60,000,000ms, i.e., 99% of the runtime was loading in the image. However, time+sub(ms) reports taking only ~100ms. I was under the impression that Time+sub should always include time self, no? In any case, I don't think read_png should be taking nearly 16 hours to read a 700,000 pixel image.

I was able to recreate the problem on a separate computer using the same code.

Profiler Snapshot here: http://i.imgur.com/xJelD.png

Cheers and thanks,
Hugh

Report message to a moderator

[Message index]

		Issues with read_png and/or profiler By: hugh.ramp on Wed, 25 July 2012 08:51
		Re: Issues with read_png and/or profiler By: hugh.ramp on Wed, 25 July 2012 10:01

Previous Topic:	Re: saving ellipse to image
Next Topic:	Re: how to convert the date into julian date

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Nov 29 07:51:31 PST 2025

Total time taken to generate the page: 0.00215 seconds