Merge pull request opencv#18003 from APrigarina:curved_qrcodes_decoding

Detection and decoding of curved QR-codes

* temp changes for curved qrcodes

* added api for curved qr code decoding

* fixed prototypes

* refactored curved qr code decoding

* refactored curved qr code decoding 2nd part

* refactored curved qr code decoding 3rd part

* refactored curved qr code decoding 4th part

* added tests for curved qr code decoding

* refactored curved qr code decoding 5th part

Author: APrigarina

modules/objdetect/include/opencv2/objdetect.hpp

@@ -702,14 +702,33 @@ class CV_EXPORTS_W QRCodeDetector
      */
     CV_WRAP cv::String decode(InputArray img, InputArray points, OutputArray straight_qrcode = noArray());
 
+    /** @brief Decodes QR code on a curved surface in image once it's found by the detect() method.
+
+     Returns UTF8-encoded output string or empty string if the code cannot be decoded.
+     @param img grayscale or color (BGR) image containing QR code.
+     @param points Quadrangle vertices found by detect() method (or some other algorithm).
+     @param straight_qrcode The optional output image containing rectified and binarized QR code
+     */
+    CV_WRAP cv::String decodeCurved(InputArray img, InputArray points, OutputArray straight_qrcode = noArray());
+
     /** @brief Both detects and decodes QR code
 
      @param img grayscale or color (BGR) image containing QR code.
      @param points optional output array of vertices of the found QR code quadrangle. Will be empty if not found.
      @param straight_qrcode The optional output image containing rectified and binarized QR code
      */
     CV_WRAP cv::String detectAndDecode(InputArray img, OutputArray points=noArray(),
-                                        OutputArray straight_qrcode = noArray());
+                                       OutputArray straight_qrcode = noArray());
+
+    /** @brief Both detects and decodes QR code on a curved surface
+
+     @param img grayscale or color (BGR) image containing QR code.
+     @param points optional output array of vertices of the found QR code quadrangle. Will be empty if not found.
+     @param straight_qrcode The optional output image containing rectified and binarized QR code
+     */
+    CV_WRAP cv::String detectAndDecodeCurved(InputArray img, OutputArray points=noArray(),
+                                             OutputArray straight_qrcode = noArray());
+
     /** @brief Detects QR codes in image and returns the vector of the quadrangles containing the codes.
      @param img grayscale or color (BGR) image containing (or not) QR codes.
      @param points Output vector of vector of vertices of the minimum-area quadrangle containing the codes.
@@ -801,6 +820,14 @@ CV_EXPORTS bool detectQRCode(InputArray in, std::vector<Point> &points, double e
     */
 CV_EXPORTS bool decodeQRCode(InputArray in, InputArray points, std::string &decoded_info, OutputArray straight_qrcode = noArray());
 
+/** @brief Decode QR code on a curved surface in image and return text that is encrypted in QR code.
+    @param in  Matrix of the type CV_8UC1 containing an image where QR code are detected.
+    @param points Input vector of vertices of a quadrangle of minimal area that describes QR code.
+    @param decoded_info String information that is encrypted in QR code.
+    @param straight_qrcode Matrix of the type CV_8UC1 containing an binary straight QR code.
+    */
+CV_EXPORTS bool decodeCurvedQRCode(InputArray in, InputArray points, std::string &decoded_info, OutputArray straight_qrcode = noArray());
+
 //! @} objdetect
 }