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我使用 OpenCV 和 OpenNI 从 Xtion 传感器生成的深度图像中提取手，然后提取单个手指。当手生成器的焦点手势已经执行时，hasHand bool 设置为 true 并运行下面的代码。hand[] 是一个浮点数组，其中包含被跟踪手的 x、y 和 z 坐标。

if(hasHand)
    {
        unsigned char shade = 255 - (unsigned char)(hand[2] *  128.0f);
        Scalar color(0, shade, 0);

        vector<Point> handContour;
        getHandContour(depthMat, hand, handContour);
        bool grasp = convexity(handContour) > grabConvexity; //PROBLEM
        int thickness = grasp ? CV_FILLED : 3;
        circle(depthMatBgr, Point(hand[0], hand[1]), 10, color, thickness);

        vector<Point> fingerTips;
        detectFingerTips(handContour, fingerTips, &depthMatBgr);
    }

一切都运行良好，直到我评论的那一行，此时我收到：

OpenCV Error: Bad argument (input array is not a valid matrix) in unknown function, ...

我已经被这个问题困扰了一段时间，我不知道为什么我会得到这个。getHandContour 的代码是：

bool getHandContour(const Mat &depthMat, const float *v, vector<Point> &handContour) 
{
const int maxHandRadius = 128; // in px
const short handDepthRange = 200; // in mm
const double epsilon = 17.5; // approximation accuracy (maximum distance between    the original hand contour and its approximation)

depth = v[2] * 1000.0f; // hand depth
nearClip = depth - 100; // near clipping plane
farClip = depth + 100; // far clipping plane

static Mat mask(frameSize, CV_8UC1);
mask.setTo(0);

// extract hand region  
circle(mask, Point(v[0], v[1]), maxHandRadius, 255, CV_FILLED);
mask = mask & depthMat > nearClip & depthMat < farClip;

// DEBUG(show mask)
imshow("mask1", mask);

// assume largest contour in hand region to be the hand contour
vector<vector<Point> > contours;
findContours(mask, contours, CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE);
int n = contours.size();
int maxI = -1;
int maxSize = -1;
for (int i=0; i<n; i++) {
    int size  = contours[i].size();
    if (size > maxSize) {
        maxSize = size;
        maxI = i;
    }
}

bool handContourFound = (maxI >= 0);

if (handContourFound) {
    approxPolyDP( Mat(contours[maxI]), handContour, epsilon, true );
}

return maxI >= 0;
}

我不确定这是否足以让人们帮助我（这对很多人来说都是新的），但任何朝着正确方向的轻推将不胜感激。

编辑：对不起，我忘了在这个问题中包含凸性（）代码：

double convexity(const vector<Point> &contour) {
Mat contourMat(contour);

vector<int> hull;
convexHull(contourMat, hull);

int n = hull.size();
vector<Point> hullContour;

for (int i=0; i<n; i++) {
    hullContour.push_back(contour[hull[i]]);
}

Mat hullContourMat(hullContour);

return (contourArea(contourMat) / contourArea(hullContourMat));
}
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1 回答 1

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我相信 approxPolyDP 只需要一个计数，而您正试图将它传递给整个列表

于 2013-05-15T03:30:30.077 回答