OpenCV Canny после ConvexPoly не работает

Я работаю над алгоритмом обнаружения дорожек с помощью opencv в c ++.
Я сделал Affine Transform, чтобы извлечь треугольную область в маску.

После этого шага я хочу выполнить детектор края Canny. Но это не работает. Это из-за битового преобразования? Или в чем моя проблема?

Я передал основную часть функции warpTriangle. В конце эта функция прерывается.

Сообщение об ошибке:

OpenCV Error: Assertion failed ((_dst.getObj() != _src.getObj() || _src.type() == (((0) & ((1 << 3) - 1)) + (((1)-1) << 3))) && "Inplace parameters are not supported") in Canny, file /tmp/opencv-20180113-80339-d8g5mw/opencv-3.4.0/modules/imgproc/src/canny.cpp, line 935
libc++abi.dylib: terminating with uncaught exception of type cv::Exception: /tmp/opencv-20180113-80339-d8g5mw/opencv-3.4.0/modules/imgproc/src/canny.cpp:935: error: (-215) (_dst.getObj() != _src.getObj() || _src.type() == (((0) & ((1 << 3) - 1)) + (((1)-1) << 3))) && "Inplace parameters are not supported" in function Canny

Скриншот

Мой код:

#include <opencv2/opencv.hpp>
#include <stdlib.h>
#include <chrono>
#include <thread>

using namespace cv;
using namespace std;

// Warps and alpha blends triangular regions from img1 and img2 to img
void warpTriangle(Mat &img1, Mat &img2, vector<Point2f> tri)
{
// Find bounding rectangle for each triangle
Rect r1 = boundingRect(tri);
Rect r2 = boundingRect(tri);

// Offset points by left top corner of the respective rectangles
vector<Point2f> tri1Cropped, tri2Cropped;
vector<Point> tri2CroppedInt;
for(int i = 0; i < 3; i++)
{
tri1Cropped.push_back( Point2f( tri[i].x - r1.x, tri[i].y -  r1.y) );
tri2Cropped.push_back( Point2f( tri[i].x - r2.x, tri[i].y - r2.y) );

// fillConvexPoly needs a vector of Point and not Point2f
tri2CroppedInt.push_back( Point((int)(tri[i].x - r2.x), (int)(tri[i].y - r2.y)) );

}

// Apply warpImage to small rectangular patches
Mat img1Cropped;
img1(r1).copyTo(img1Cropped);

// Given a pair of triangles, find the affine transform.
Mat warpMat = getAffineTransform( tri1Cropped, tri2Cropped );

// Apply the Affine Transform just found to the src image
Mat img2Cropped = Mat::zeros(r2.height, r2.width, img1Cropped.type());
warpAffine( img1Cropped, img2Cropped, warpMat, img2Cropped.size(), INTER_LINEAR, BORDER_REFLECT_101);

// Get mask by filling triangle
Mat mask = Mat::zeros(r2.height, r2.width, CV_32FC3);
fillConvexPoly(mask, tri2CroppedInt, Scalar(1.0, 1.0, 1.0), 16, 0);
imshow("mask", mask);
// Copy triangular region of the rectangular patch to the output image

multiply(img2Cropped,mask, img2Cropped);

img2Cropped.convertTo(img2Cropped, CV_8U);
imshow("img2Cropped",img2Cropped);
Canny(img2Cropped, img2Cropped, 50, 150);   <--- Breaks here!

}

int main( int argc, char** argv)
{

//  VideoCapture cap(0);
// Challenge video
VideoCapture cap("/Users/markus/Desktop/challenge.mp4");
Mat imgIn;
while (true)
{
Mat start;

Mat frame = Mat(320,480, CV_8U, 0.0);
cap >> start;

resize(start, frame, frame.size());

cout << "h: " << frame.rows << " w: " << frame.cols << endl;

Mat imgIn = frame;

// Read input image and convert to float
imgIn.convertTo(imgIn, CV_32FC3, 1/255.0);

// Output image is set to white
Mat imgOut = Mat::ones(imgIn.size(), imgIn.type());
imgOut = Scalar(0.0,0.0,0.0);

int height, width;
height = frame.rows;
width = frame.cols;
// Input triangle
vector <Point2f> triIn;
triIn.push_back(Point2f(0,height-1));
triIn.push_back(Point2f(width-1,height-1));
triIn.push_back(Point2f(width/2-1,height/2-1));

// Warp all pixels inside input triangle to output triangle
warpTriangle(imgIn, imgOut, triIn);

// Draw triangle on the input and output image.

// Convert back to uint because OpenCV antialiasing
// does not work on image of type CV_32FC3

imgIn.convertTo(imgIn, CV_8UC3, 255.0);
imgOut.convertTo(imgOut, CV_8UC3, 255.0);

// Draw triangle using this color
Scalar color = Scalar(255, 150, 0);

// cv::polylines needs vector of type Point and not Point2f
vector <Point> triInInt, triOutInt;
for(int i=0; i < 3; i++)
{
triInInt.push_back(Point(triIn[i].x,triIn[i].y));
}

// Draw triangles in input and output images
polylines(imgIn, triInInt, true, color, 2, 16);
polylines(imgOut, triOutInt, true, color, 2, 16);

imshow("frame", imgIn);if (waitKey(30) >= 0) {
break;
}
}
return 0;
}