Update detect QRCode algorithm

modules/objdetect/include/opencv2/objdetect.hpp

@@ -670,6 +670,21 @@ public:
     void groupRectangles(std::vector<cv::Rect>& rectList, std::vector<double>& weights, int groupThreshold, double eps) const;
 };
 
+class CV_EXPORTS QRCodeDetector
+{
+public:
+    QRCodeDetector();
+    ~QRCodeDetector();
+
+    void setEpsX(double epsX);
+    void setEpsY(double epsY);
+
+    bool detect(InputArray in, OutputArray points) const;
+protected:
+    struct Impl;
+    Ptr<Impl> p;
+};
+
 /** @brief Detect QR code in image and return minimum area of quadrangle that describes QR code.
     @param in  Matrix of the type CV_8UC1 containing an image where QR code are detected.
     @param points Output vector of vertices of a quadrangle of minimal area that describes QR code.

modules/objdetect/test/test_qrcode.cpp

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+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
 
 #include "test_precomp.hpp"
 
-namespace opencv_test { namespace {
 
-TEST(Objdetect_QRCode, regression)
+namespace opencv_test
+{
+
+String qrcode_images_name[] = {
+    "20110817_030.jpg",
+    "20110817_048.jpg",
+    "img_20120226_161648.jpg",
+    "img_2714.jpg",
+    "img_2716.jpg",
+    "img_3011.jpg",
+    "img_3029.jpg",
+    "img_3070.jpg",
+    "qr_test_030.jpg"
+};
+
+// #define UPDATE_QRCODE_TEST_DATA
+#ifdef  UPDATE_QRCODE_TEST_DATA
+
+TEST(Objdetect_QRCode, generate_test_data)
 {
     String root = cvtest::TS::ptr()->get_data_path() + "qrcode/";
-    // String cascades[] =
-    // {
-        // root + "haarcascade_frontalface_alt.xml",
-        // root + "lbpcascade_frontalface.xml",
-        // String()
-    // };
-
-    // vector<Rect> objects;
-    // RNG rng((uint64)-1);
-
-    // for( int i = 0; !cascades[i].empty(); i++ )
-    // {
-        // printf("%d. %s\n", i, cascades[i].c_str());
-        // CascadeClassifier cascade(cascades[i]);
-        // for( int j = 0; j < 100; j++ )
-        // {
-            // int width = rng.uniform(1, 100);
-            // int height = rng.uniform(1, 100);
-            // Mat img(height, width, CV_8U);
-            // randu(img, 0, 256);
-            // cascade.detectMultiScale(img, objects);
-        // }
-    // }
+    String dataset_config = cvtest::TS::ptr()->get_data_path() + "qrcode/dataset_config.json";
+    FileStorage file_config(dataset_config, FileStorage::WRITE);
+
+    file_config << "test_images" << "[";
+    size_t images_count = sizeof(qrcode_images_name) / sizeof(String);
+    for (size_t i = 0; i < images_count; i++)
+    {
+        file_config << "{:" << "image_name" << qrcode_images_name[i];
+        String image_path = root + qrcode_images_name[i];
+        std::vector<Point> transform;
+        Mat src = imread(image_path, IMREAD_GRAYSCALE);
+        EXPECT_TRUE(detectQRCode(src, transform));
+        file_config << "x" << "[:";
+        for (size_t j = 0; j < transform.size(); j++) { file_config << transform[j].x; }
+        file_config << "]";
+        file_config << "y" << "[:";
+        for (size_t j = 0; j < transform.size(); j++) { file_config << transform[j].y; }
+        file_config << "]" << "}";
+    }
+    file_config << "]";
+    file_config.release();
 }
 
-}} // namespace
+#else
+
+typedef testing::TestWithParam< String > Objdetect_QRCode;
+TEST_P(Objdetect_QRCode, regression)
+{
+    String root = cvtest::TS::ptr()->get_data_path() + "qrcode/";
+    String dataset_config = cvtest::TS::ptr()->get_data_path() + "qrcode/dataset_config.json";
+    FileStorage file_config(dataset_config, FileStorage::READ);
+    const int pixels_error = 3;
+
+    std::vector<Point> corners;
+    String image_path = root + String(GetParam());
+    Mat src = imread(image_path, IMREAD_GRAYSCALE);
+    EXPECT_TRUE(detectQRCode(src, corners));
+
+    if (file_config.isOpened())
+    {
+        FileNode images_list = file_config["test_images"];
+        int index = 0, images_count = static_cast<int>(images_list.size());
+        ASSERT_GT(images_count, 0);
+
+        bool runTestsFlag = false;
+        String name_current_image = String(GetParam());
+        for (; index < images_count; index++)
+        {
+            String name_test_image = images_list[index]["image_name"];
+            if (name_test_image == name_current_image)
+            {
+                for (int i = 0; i < 4; i++)
+                {
+                    int x = images_list[index]["x"][i];
+                    int y = images_list[index]["y"][i];
+                    EXPECT_NEAR(x, corners[i].x, pixels_error);
+                    EXPECT_NEAR(y, corners[i].y, pixels_error);
+                }
+                runTestsFlag = true;
+            }
+        }
+        if (!runTestsFlag)
+        {
+            std::cout << "Not found results for " << name_current_image;
+            std::cout << " image in dataset_config.json file." << std::endl;
+        }
+
+        file_config.release();
+    }
+    else
+    {
+        std::cout << " Not found dataset_config.json file." << std::endl;
+    }
+}
+
+INSTANTIATE_TEST_CASE_P(objdetect, Objdetect_QRCode, testing::ValuesIn(qrcode_images_name));
+
+TEST(Objdetect_QRCode, not_found_qrcode)
+{
+    std::vector<Point> corners;
+    Mat zero_image = Mat::zeros(256, 256, CV_8UC1);
+    EXPECT_FALSE(detectQRCode(zero_image, corners));
+}
+
+#endif
+
+} // namespace