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Hand center detection

asked 2012-07-24 05:13:51 -0500

seiko gravatar image

updated 2012-07-24 06:11:45 -0500

Andrey Pavlenko gravatar image

I am detecting the hand, using Defects but i need only the palm without fingers, the center of the palm without fingers. I wrote this piece of code:

int ht, //height left 
    hb, //height right
    wl, //width top
    wr; //width botton
bool ok = true;
label1.Text = label1.Text + ",";
for(int i = 10; i < skin.Height - 10; i += 10)
    for(int j = 10; j < skin.Width - 10; j+=10)
    {
        wl = wr = j;
        ht = hb = i;
        if(skin[i, j].MCvScalar.v0 == 0)
            ok = true;
            while(ok)
            {
                wl--;
                wr++;
                ht--;
                hb++;
                if( (wl <= 0 || wr >=skin.Height || ht <= 0 || hb >=skin.Width) || 
                    ( skin[j, ht].MCvScalar.v0 != 0 || skin[j, hb].MCvScalar.v0 != 0 ||
                      skin[wl, j].MCvScalar.v0 != 0 || skin[wr, j].MCvScalar.v0 != 0) )
                {
                    if(maxCircleRadius < (wr - wl) / 2)
                    {
                        maxCircleRadius = (wr - wl) / 2;
                        palmCenter.X = (wr + wl) / 2;
                        palmCenter.Y = (ht + hb) / 2;
                        currentFrame.Draw(new CircleF(new PointF(palmCenter.X, palmCenter.Y), 3), new Bgr(200, 125, 75), 2);
                        label1.Text = maxCircleRadius.ToString();
                    }
                    ok = false;
                }
            }
    }

but it takes around 0.5 sec for each image to detect the palm wich is way too much for me. Is there any other solution to detect the palm without fingers?

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Comments

The performance problem may be the drawing delay. Try removing the Draw() and label.Text calls and re-measure your app. You should also make sure you compile for Release.

sammy gravatar imagesammy ( 2012-07-24 06:23:35 -0500 )edit

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answered 2012-07-24 06:43:28 -0500

Daniil Osokin gravatar image

Here is a tutorial Convex Hull, may be some approaches will useful. As in tutorial you can try to use findContours, and then fitEllipse to find centre of contour. Hope, this helps.

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I know that way...but when you close/open the palm the center is not the same and i need a stable point, as much is possible.

seiko gravatar imageseiko ( 2012-07-31 02:22:57 -0500 )edit
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Asked: 2012-07-24 05:13:51 -0500

Seen: 3,150 times

Last updated: Jul 24 '12