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2017-08-24 16:25:27 -0500 received badge  Student (source)
2015-12-21 04:23:34 -0500 commented answer not rect ROI defined by 4 points

This solution works fine, but I have to store points after convexhull in a different vector. Adding:

cerr << "A " << points.at(0).x << " - " << points.at(0).y << endl;
cerr << "B " << points.at(1).x << " - " << points.at(1).y << endl;
cerr << "C " << points.at(2).x << " - " << points.at(2).y << endl;
cerr << "D " << points.at(3).x << " - " << points.at(3).y << endl;

Before and after convexhull i have:

A 300 - 50 B 300 - 20 C 150 - 300 D 200 - 300

A 300 - 50 B 200 - 300 C 150 - 300 D 200 - 300

And the point (300,20) disappear. With:

 vector<Point> points2;


//Find the corresponding ROI based on the poitns
convexHull(points, points2);                         //to assure correct point order

It all works fine!

Thank you

2015-12-21 04:18:56 -0500 received badge  Supporter (source)
2015-12-21 02:54:10 -0500 commented answer not rect ROI defined by 4 points

I don't need the number of pixel of one color. The image is thresholded and is black and white. I need to know how many white pixel there are only in the ROI, non in the complete image.

2015-12-20 17:13:58 -0500 received badge  Editor (source)
2015-12-20 12:56:24 -0500 asked a question not rect ROI defined by 4 points

Hi, I would use the method countNonZero (InputArray src) on a ROI of my image; The ROI is not a rect, but it's defined by the points A, B, C, D like the red zone in the figure.

How can I use this method on this ROI?

image description

2015-11-11 12:45:27 -0500 received badge  Enthusiast
2015-11-09 09:37:22 -0500 commented question ear classifier for frontal face

I didn't do it!

2015-11-09 09:29:39 -0500 received badge  Scholar (source)
2015-11-09 06:06:57 -0500 asked a question BackgroundSubtractorMOG2 set parameters

Hi, i'm trying to use the class BackgroundSubtracorMOG2 with Opencv 3.0.

After:

Ptr<BackgroundSubtractor> pMOG2;

pMOG2 = createBackgroundSubtractorMOG2();

I want to set some parameters like:

    pMOG2.setShadowThreshold(0.5);

But it tells me:

No member named 'setShadowThreshold' in 'cv::Ptr<cv::backgroundsubtractor>'

Same with the operator "->" instead of "."

Do you know how to set parameters of this class?

2015-01-26 10:48:52 -0500 asked a question ear classifier for frontal face

Hi all, I need an ears detector from frontal face image.

haarcascade_mcs_leftear.xml in openCV/data/haarcascade works only with profile image and not with frontal faces.

Do you know how can I solve this problem?

Thanks

Giuseppe