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Is there any way to decrease CPU usage of feature detector?

asked 2016-03-10 03:17:49 -0500

Oguzhan gravatar image

updated 2016-03-10 03:38:44 -0500

berak gravatar image

Hi everbody,

The feature detector,in OpenCV c++, launches 14 threads and makes heavy usage of CPU (more than 50%). Is there any way to decrease this usage.

Simple code:

cv::Mat grayImage= cv::imread("image.bmp",CV_LOAD_IMAGE_GRAYSCALE);

cv::FeatureDetector *detector;

detector = new cv::SURF(300, 1);


std::vector<cv::KeyPoint> keyPoints;

detector->detect(grayImage, keyPoints);

enviroınment: Intel i7 3770K , 8GB RAM, Windows 8.1 Pro Visual studio 2013 Pro

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2 answers

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answered 2020-10-13 07:31:30 -0500

batug gravatar image

try using cv::setNumThreads(int); OpenCV library beware that it spawns multiple threads for image processing internally. So, setting the number of threads to be spawned by OpenCV could be a good choice.

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answered 2016-03-10 04:03:53 -0500

Try this:

#include <tbb\task_scheduler_init.h>

tbb::task_scheduler_init init(1);
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Thank you for your answer. However, It couldn't solve. Actually even if it could solve, it is not appropriate for my project. Let me give you the big picture: I am trying to implement a project in a pipes & filters fashion using tbb library. The feature detection is one of the filters. Since openCV's feature detection occupies more than 50% of CPU resources, I could not run more than two filter in parallel which is the main ideo of pipes&filters design. This destroys the performance of my pipeline. Any other recommendation on that?

Oguzhan gravatar imageOguzhan ( 2016-03-10 10:18:25 -0500 )edit

Have you tried cv::setNumThreads ?

Eduardo gravatar imageEduardo ( 2016-03-11 08:08:23 -0500 )edit

That works. Thank you.

Oguzhan gravatar imageOguzhan ( 2016-03-11 08:24:42 -0500 )edit

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Asked: 2016-03-10 03:17:49 -0500

Seen: 1,614 times

Last updated: Mar 10 '16