OPENCV based on the color of the license plate location

OPENCV based on the color of the license plate location

http://blog.csdn.net/superdont/article/details/24936341

OPENCV based on the color of the license plate location2014-05-03 22:05 4626 People read Comments (3) favorite reports Classification:image Processing (a)OpenCV (in)

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Use Color properties:

[CPP]View PlainCopy  

2. Mat Srcimage=imread ("image/t10.jpg");
4. Mat Srcshowimage;
6. Srcimage.copyto (Srcshowimage);
8. //imshow ("a", srcimage);
10. int i,j;
12. int cpointb,cpointg,cpointr;
14. For (i=1;i<srcimage.rows;i++)
16. For (j=1;j<srcimage.cols;j++)
18. {
20. Cpointb=srcimage.at<vec3b> (I,J) [0];
22. Cpointg=srcimage.at<vec3b> (I,J) [1];
24. Cpointr=srcimage.at<vec3b> (I,J) [2];
26. if (cpointb>80&cpointr<80&cpointg<80) //extract blue, set the area to black
28. {
30. Srcimage.at<vec3b> (I,J) [0]=0;
32. Srcimage.at<vec3b> (I,J) [1]=0;
34. Srcimage.at<vec3b> (I,J) [2]=0;
36. }
40. Else if (cpointb>200&cpointr>200&cpointg>200) //Extract white, set it to black
42. {
44. Srcimage.at<vec3b> (I,J) [0]=0;
46. Srcimage.at<vec3b> (I,J) [1]=0;
48. Srcimage.at<vec3b> (I,J) [2]=0;
50. }
54. Else
56. {
58. Srcimage.at<vec3b> (I,J) [0]=255;
60. Srcimage.at<vec3b> (I,J) [1]=255;
62. Srcimage.at<vec3b> (I,J) [2]=255;
64. }
68. }
70. Cvtcolor (Srcimage,srcimage, Cv_bgr2gray);
72. Threshold (srcimage,srcimage,127, 255,cv_thresh_binary);
74. //Use the difference method to remove irrelevant areas.
76. For (i=1;i<srcimage.rows;i++)
78. For (j=1;j<srcimage.cols-1;j++)
80. {
82. Srcimage.at<uchar> (i,j) =srcimage.at<uchar> (i,j+1)-srcimage.at<uchar> (I,J);
86. }
90. Threshold (srcimage,srcimage,127, 255,CV_THRESH_BINARY_INV);  //By the two value of the way to take the reverse.
92. //erode (Srcimage,srcimage,mat (5,5,cv_8u), point ( -1,-1), 2); Corrosion
94. //Dilate (Src,src,mat (5,5,cv_8u), point ( -1,-1), 2); //expansion
96. //Morphologyex (Src,src,morph_open,mat (3,3,cv_8u), point ( -1,-1), 1); Open Operation
98. //Morphologyex (Src,src,morph_close,mat (3,3,cv_8u), point ( -1,-1), 1); Closed Operation
100. Erode (Srcimage,srcimage,mat (3,3,cv_8u), point ( -1,-1), 5);
102. Threshold (SRCIMAGE,SRCIMAGE,127,255,CV_THRESH_BINARY_INV);
104. Imshow ("a", srcimage);
106. vector<vector<point> > contours;
108. Vector<vec4i> hierarchy;
110. Findcontours (srcimage, contours, hierarchy, cv_retr_external, Cv_chain_approx_simple, point (0, 0));
112. Scalar color = scalar (rng.uniform (0, 255), Rng.uniform (0,255), Rng.uniform (0,255));
114. For ( int i = 0; i < contours.size (); i++)
116. {
118. //How to use the bounding box
120. Cvrect arect = Boundingrect (Contours[i]);
122. int tmparea=arect.height*arect.height;
124. if ((double) arect.width/(double)arect.height>2) && ((Double) arect.width/(double) arect.height<6) && tmparea>=2000&&tmparea<=25000)
126. {
128. Rectangle (Srcshowimage,cvpoint (ARECT.X,ARECT.Y), Cvpoint (Arect.x+arect.width, arect.y+arect.height), color,2);
130. //cvdrawcontours (DST, contours, color, color,-1, 1, 8);
132. }
134. }
140. Imshow ("Da", Srcshowimage);

The effect is as follows:

Colors can be considered more nuanced, or considered to be implemented in other color spaces.

OPENCV based on the color of the license plate location