float fy = flow_at_point[1];
if ((fabs(fx) > UNKNOWN_FLOW_THRESH) || (fabs(fy) > UNKNOWN_FLOW_THRESH))
continue;
float rad = sqrt(fx * fx + fy * fy);
maxrad = maxrad > rad ? maxrad : rad;
}
}
for (int i= 0; i < flow.rows; ++i)
{
for (int j = 0; j < flow.cols; ++j)
{
uchar *data = color.data + color.step[0] * i + color.step[1] * j;
Vec2f flow_at_point = flow.at<Vec2f>(i, j);
float fx = flow_at_point[0] / maxrad;
float fy = flow_at_point[1] / maxrad;
if ((fabs(fx) > UNKNOWN_FLOW_THRESH) || (fabs(fy) > UNKNOWN_FLOW_THRESH))
{
data[0] = data[1] = data[2] = 0;
continue;
}
float rad = sqrt(fx * fx + fy * fy);
float angle = atan2(-fy, -fx) / CV_PI;
float fk = (angle + 1.0) / 2.0 * (colorwheel.size()-1);
int k0 = (int)fk;
int k1 = (k0 + 1) % colorwheel.size();
float f = fk - k0;
//f = 0; // 取消评论看原色轮
for (int b = 0; b < 3; b++)
{
float col0 = colorwheel[k0][b] / 255.0;
float col1 = colorwheel[k1][b] / 255.0;
float col = (1 - f) * col0 + f * col1;
