fixed duplicate corners and style

Author: AleksandrPanov

modules/wechat_qrcode/src/decodermgr.cpp

@@ -45,14 +45,14 @@ int DecoderMgr::decodeImage(cv::Mat src, bool use_nn_detector, vector<string>& r
         }
         int ret = TryDecode(source, zx_results);
         if (!ret) {
-            for(unsigned int k=0; k<zx_results.size(); k++){
+            for(size_t k = 0; k < zx_results.size(); k++) {
                 results.emplace_back(zx_results[k]->getText()->getText());
                 vector<Point2f> tmp_qr_points;
                 auto tmp_zx_points = zx_results[k]->getResultPoints();
-                for(int i = 0; i < tmp_zx_points->size() / 4; i++) {
+                for (int i = 0; i < tmp_zx_points->size() / 4; i++) {
                     const int ind = i * 4;
                     for (int j = 1; j < 4; j++){
-                        tmp_qr_points.emplace_back(tmp_zx_points[ind+j]->getX(), tmp_zx_points[ind+j]->getY());
+                        tmp_qr_points.emplace_back(tmp_zx_points[ind + j]->getX(), tmp_zx_points[ind + j]->getY());
                     }
                     tmp_qr_points.emplace_back(tmp_zx_points[ind]->getX(), tmp_zx_points[ind]->getY());
                 }

modules/wechat_qrcode/src/wechat_qrcode.cpp

@@ -144,10 +144,10 @@ vector<string> WeChatQRCode::Impl::decode(const Mat& img, vector<Mat>& candidate
                 super_resolution_model_->processImageScale(cropped_img, cur_scale, use_nn_sr_);
             string result;
             DecoderMgr decodemgr;
-            vector<vector<Point2f>> zxing_points;
+            vector<vector<Point2f>> zxing_points, check_points;
             auto ret = decodemgr.decodeImage(scaled_img, use_nn_detector_, decode_results, zxing_points);
             if (ret == 0) {
-                for(unsigned int i=0; i<zxing_points.size(); ++i){
+                for(size_t i = 0; i <zxing_points.size(); i++){
                     vector<Point2f> points_qr = zxing_points[i];
                     for (auto&& pt: points_qr) {
                         pt /= cur_scale;
@@ -159,7 +159,28 @@ vector<string> WeChatQRCode::Impl::decode(const Mat& img, vector<Mat>& candidate
                         point.at<float>(j, 0) = points_qr[j].x;
                         point.at<float>(j, 1) = points_qr[j].y;
                     }
-                    points.push_back(point);
+                    // try to find duplicate qr corners
+                    bool isDuplicate = false;
+                    for (const auto &tmp_points: check_points) {
+                        const float eps = 10.f;
+                        for (size_t j = 0; j < tmp_points.size(); j++) {
+                            if (abs(tmp_points[j].x - points_qr[j].x) < eps &&
+                                abs(tmp_points[j].y - points_qr[j].y) < eps) {
+                                isDuplicate = true;
+                            }
+                            else {
+                                isDuplicate = false;
+                                break;
+                            }
+                        }
+                    }
+                    if (isDuplicate == false) {
+                        points.push_back(point);
+                        check_points.push_back(points_qr);
+                    }
+                    else {
+                        decode_results.erase(decode_results.begin() + i, decode_results.begin() + i + 1);
+                    }
                 }
                 break;
             }