OpenCV Slows Framerate - How to Buffer Data from OpenCV?

ilumos

OpenCV Slows Framerate - How to Buffer Data from OpenCV?

in Contributed Library Questions • 2 years ago

Hi,

I'm working with OpenCV facetracking to affect a simple particle system.

When just the particle system is running the framerate is fine, around 50fps.

However, when the facetracking is uncommented, it slows the sketch to under 10fps.

How would I allow the particle system to run at full speed while it waits for the new face co-ordinates from OpenCV?

Many thanks in advance,

ilumos

Replies(2)

clankill3r

Re: OpenCV Slows Framerate - How to Buffer Data from OpenCV?

2 years ago

I don't have experiences yet with face tracking (not yet) but i have some ideas so i post them anyway (hope they work).

1. do the tracking on a lower resolution image

2. don't check every frame, but only every 10 frames for example (you will have framedrops...).

3. split up the screen in parts, check every frame a part, make sure the parts overlap in case a face is inbetween.

if you need to check more then 1 face then remember where a face has been seen and check that part also.

hope it helps

afreise

Re: OpenCV Slows Framerate - How to Buffer Data from OpenCV?

2 years ago

The face detection needs some extra CPU power, so you probably cannot avoid a slowdown completely. However, you might want to try to use a separate thread for OpenCV. This has worked very well for me in the past. As I said in the post, I have provided a simple implementation of that in the code of the 'You are Einstein' sketch:

http://www.gwoptics.org/processing/you_are_einstein/

You can provide a `wait time' that slows down the face detection until the frame rate is high enough. Maybe it helps.

Andreas

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