prompt: Create a C++ function that passes an image and returns the image with a canny edge detection filter
chosen.role: system
chosen.content: A chat.
chosen.role: user
chosen.content: Create a C++ function that passes an image and returns the image with a canny edge detection filter
chosen.role: assistant
chosen.content: Here is code that performs a canny edge detection using the OpenCV library:
  
  #include <opencv2/opencv.hpp>
  
  cv::Mat applyCannyEdgeDetection(const cv::Mat& inputImage, double threshold1, double threshold2)
  {
      // Convert the input image to grayscale
      cv::Mat grayImage;
      cv::cvtColor(inputImage, grayImage, cv::COLOR_BGR2GRAY);
      
      // Apply Gaussian blur to reduce noise
      cv::Mat blurredImage;
      cv::GaussianBlur(grayImage, blurredImage, cv::Size(5, 5), 0);
      
      // Apply Canny edge detection
      cv::Mat edges;
      cv::Canny(blurredImage, edges, threshold1, threshold2);
      
      // Create a mask by thresholding the edges
      cv::Mat mask;
      cv::threshold(edges, mask, 128, 255, cv::THRESH_BINARY);
      
      // Apply the mask to the input image to show only the edges
      cv::Mat outputImage;
      inputImage.copyTo(outputImage, mask);
      
      return outputImage;
  }
  
  int main()
  {
      // Load an input image
      cv::Mat inputImage = cv::imread("input.jpg");
      
      if (inputImage.empty()) {
          std::cerr << "Failed to load the input image" << std::endl;
          return 1;
      }
      
      // Apply Canny edge detection to the input image
      double threshold1 = 50.0;
      double threshold2 = 150.0;
      cv::Mat outputImage = applyCannyEdgeDetection(inputImage, threshold1, threshold2);
      
      // Display the input and output images
      cv::imshow("Input Image", inputImage);
      cv::imshow("Canny Edge Detection", outputImage);
      cv::waitKey(0);
      
      return 0;
  }
rejected.role: system
rejected.content: A chat.
rejected.role: user
rejected.content: Create a C++ function that passes an image and returns the image with a canny edge detection filter
rejected.role: assistant