advance db post_process !756

Created by: LDOUBLEV

deploy/cpp_infer/src/ocr_det.cpp

   const double maxvalue = 255;
   cv::Mat bit_map;
   cv::threshold(cbuf_map, bit_map, threshold, maxvalue, cv::THRESH_BINARY);
-
+  cv::Mat dilation_map;
+  cv::Mat dila_ele = cv::getStructuringElement(cv::MORPH_RECT, cv::Size(2,2));
+  cv::dilate(bit_map, dilation_map, dila_ele);
   boxes = post_processor_.BoxesFromBitmap(
-      pred_map, bit_map, this->det_db_box_thresh_, this->det_db_unclip_ratio_);
+      pred_map, dilation_map, this->det_db_box_thresh_, this->det_db_unclip_ratio_);
 
   boxes = post_processor_.FilterTagDetRes(boxes, ratio_h, ratio_w, srcimg);
 

deploy/cpp_infer/src/postprocess_op.cpp

                           pow(boxes[n][0][1] - boxes[n][1][1], 2)));
     rect_height = int(sqrt(pow(boxes[n][0][0] - boxes[n][3][0], 2) +
                            pow(boxes[n][0][1] - boxes[n][3][1], 2)));
-    if (rect_width <= 10 || rect_height <= 10)
+    if (rect_width <= 4 || rect_height <= 4)
       continue;
     root_points.push_back(boxes[n]);
   }

deploy/cpp_infer/tools/config.txt

 max_side_len  960
 det_db_thresh  0.3
 det_db_box_thresh  0.5
-det_db_unclip_ratio  2.0
+det_db_unclip_ratio  1.6
 det_model_dir  ./inference/det_db
 
 # cls config

deploy/lite/config.txt

 max_side_len  960
 det_db_thresh  0.3
 det_db_box_thresh  0.5
-det_db_unclip_ratio  2.0
\ No newline at end of file
+det_db_unclip_ratio  1.6
\ No newline at end of file

deploy/lite/db_post_process.cc

     rect_height =
         static_cast<int>(sqrt(pow(boxes[n][0][0] - boxes[n][3][0], 2) +
                               pow(boxes[n][0][1] - boxes[n][3][1], 2)));
-    if (rect_width <= 10 || rect_height <= 10)
+    if (rect_width <= 4 || rect_height <= 4)
       continue;
     root_points.push_back(boxes[n]);
   }

[saxon_zh]

Created by: WenmuZhou

good job to big old