Question

我正在尝试像这样计算图像质心：

// Calculate centroid
    double signedArea = 0.0;
    sskp_point centroid;
    for(int i=0;i<numPoints;i++)
    {
        double a = (points[i].x*points[(i+1)%numPoints].y)-(points[(i+1)%numPoints].x*points[i].y);
        signedArea += a;
        centroid.x += (points[i].x*points[(i+1)%numPoints].x)*a;
        centroid.y += (points[i].y*points[(i+1)%numPoints].y)*a;
        printf("points[%d] = { %f, %f }\n",i,points[i].x,points[i].y);
    }
    signedArea /= 2.0;
    centroid.x /= (6*signedArea);
    centroid.y /= (6*signedArea);
    printf("centroid = { %f, %f }\n",centroid.x,centroid.y);

我已经从算法here中对此进行了调整，但它给了我错误的results，有人能告诉我这次改编有什么问题吗？

Answer 1

你写过centroid.x += (points[i].x*points[(i+1)%numPoints].x)*a; 相反它应该是centroid.x += (points[i].x+points[(i+1)%numPoints].x)*a; 您必须在此处将*替换为+。

Answer 2

我看了一下你采取这个样本的主题，我想你应该有 centroid.x + =（points [i] .x + points [（i + 1）％numPoints] .x）* a; centroid.y + =（points [i] .y + points [（i + 1）％numPoints] .y）* a;

查找图像等高线质心

2 个答案: