ANPR algorithm

1.plate detection
2.plate recognition

Plate detection

• Sobel filter
• Threshold operation
• Close morphologic operation
• Mask of one filled area
• Possible detected plates marked in red (features images)
• Detected plates after the SVM classifier

Segmentation

   //convert image to gray
   Mat img_gray;
   cvtColor(input, img_gray, CV_BGR2GRAY);
   blur(img_gray, img_gray, Size(5,5));

   用 Sobel 滤波器查找垂直边线
   //Find vertical lines. Car plates have high density of vertical lines
   Mat img_sobel;
   Sobel(img_gray, img_sobel, CV_8U, 1, 0, 3, 1, 0);
   
   获取黑白图
   //threshold image
   Mat img_threshold;
   threshold(img_sobel, img_threshold, 0, 255, CV_THRESH_OTSU+CV_THRESH_
   BINARY);

编译chapter5

在之前 2013-02-28-opencv-xcode-build 工程的基础上构建 ANPR 项目

1.导入项目文件
2.设置 c++ Standard Library 为 libstdc++(GNU c++ standard library)
3.lsh_table.h 文件中 
	#if USE_UNORDERED_MAP
	#include <unordered_map>
	#else

改为

	#if USE_UNORDERED_MAP
	#include <tr1/unordered_map>
	#else

link

link

---

---

Published