c++ - openCV没有匹配函数fillPoly

Question

我正在尝试实现 this回答，但我总是出错。请帮忙。

我的代码:

cv::Point corners[1][6];

for (unsigned long j = startIndex; j < startIndex+6; j++) {
  int x = shape.part(j).x(); 
  int y = shape.part(j).y();

  corners[0][j-startIndex] = Point(x, y);
}
const Point* corner_list[1] = {corners[0]};

cv::Mat mask(image.rows, image.cols, CV_8UC2);
cv::fillPoly(mask, corner_list, 6, 1, cv::Scalar(255), 8);
cv::Mat result(image.size(), image.type(), cv::Scalar(0,0,0));
image.copyTo(result, mask);

这是我的错误:

jni/jni_detections/jni_face_det.cpp:121:5: error: no matching function for call to 'fillPoly'
    cv::fillPoly( mask, corner_list, num_points, num_polygons, cv::Scalar( 255, 255, 255 ),  line_type);
    ^~~~~~~~~~~~ 
/home/feli/Development/android/test/dlib/dlib-android/third_party/opencv/jni/include/opencv2/imgproc.hpp:3987:17: note: 
      candidate function not viable: no known conversion from 'int' to 'const int *' for 3rd argument; take the address of
      the argument with & CV_EXPORTS void fillPoly(Mat& img, const Point** pts,
                                          ^ 
/home/feli/Development/android/test/dlib/dlib-android/third_party/opencv/jni/include/opencv2/imgproc.hpp:4005:19: note: 
      candidate function not viable: no known conversion from 'const Point *[1]' to 'const cv::_InputArray' for 2nd argument 
CV_EXPORTS_W void fillPoly(InputOutputArray img, InputArrayOfArrays pts,
                  ^

我的OpenCV版本是3.1.0

Answer 1

我需要像这样传递 numPoints 参数的指针:

int num_points = 6;
cv::fillPoly(mask, corner_list, &num_points, 1, cv::Scalar(255), 8);

谢谢@Tim Sweet