root / trunk / code / projects / colonet / server / vision / fitellipse.c @ 1428
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1 | 313 | chihsiuh | /**
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2 | * fitellipse.c
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3 | * based on opencv's sample program fitellipse.c by Denis Burenkov
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4 | *
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5 | * @author Rich Hong
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6 | * @date 12/05/2007
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7 | */
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8 | #ifdef _CH_
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9 | #pragma package <opencv>
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10 | #endif
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11 | |||
12 | #ifndef _EiC
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13 | #include "cv.h" |
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14 | #include "highgui.h" |
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15 | #endif
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16 | #include <stdio.h> |
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17 | #include <stdlib.h> |
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18 | |||
19 | int slider_pos = 200; |
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20 | |||
21 | // Load the source image. HighGUI use.
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22 | IplImage *image02 = 0, *image03 = 0, *image04 = 0; |
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23 | |||
24 | void process_image(int h); |
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25 | |||
26 | int main( int argc, char** argv ) { |
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27 | const char* filename = argc == 2 ? argv[1] : (char*)"colonet.jpg"; |
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28 | |||
29 | // load image and force it to be grayscale
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30 | if( (image03 = cvLoadImage(filename, 0)) == 0 ) return -1; |
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31 | |||
32 | // Create the destination images
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33 | image02 = cvCloneImage( image03 ); |
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34 | image04 = cvCloneImage( image03 ); |
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35 | |||
36 | // Create windows.
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37 | cvNamedWindow("Source", 1); |
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38 | // Show the image.
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39 | cvShowImage("Source", image03);
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40 | cvNamedWindow("Result", 1); |
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41 | // Create toolbars. HighGUI use.
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42 | cvCreateTrackbar( "Threshold", "Result", &slider_pos, 255, process_image ); |
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43 | process_image(0);
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44 | |||
45 | // Wait for a key stroke; the same function arranges events processing
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46 | cvWaitKey(0);
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47 | |||
48 | cvReleaseImage(&image02); |
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49 | cvReleaseImage(&image03); |
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50 | |||
51 | cvDestroyWindow("Source");
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52 | cvDestroyWindow("Result");
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53 | return 0; |
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54 | } |
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55 | |||
56 | // Define trackbar callback functon. This function find contours,
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57 | // draw it and approximate it by ellipses.
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58 | void process_image(int h) |
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59 | { |
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60 | CvMemStorage* stor; |
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61 | CvSeq* cont; |
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62 | CvBox2D32f* box; |
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63 | CvPoint* PointArray; |
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64 | CvPoint2D32f* PointArray2D32f; |
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65 | |||
66 | // Create dynamic structure and sequence.
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67 | stor = cvCreateMemStorage(0);
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68 | cont = cvCreateSeq(CV_SEQ_ELTYPE_POINT, sizeof(CvSeq), sizeof(CvPoint) , stor); |
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69 | |||
70 | // Threshold the source image. This needful for cvFindContours().
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71 | cvThreshold( image03, image02, slider_pos, 255, CV_THRESH_BINARY );
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72 | |||
73 | // Find all contours.
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74 | cvFindContours( image02, stor, &cont, sizeof(CvContour),
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75 | CV_RETR_LIST, CV_CHAIN_APPROX_NONE, cvPoint(0,0)); |
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76 | |||
77 | // Clear images. IPL use.
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78 | cvZero(image02); |
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79 | cvZero(image04); |
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80 | |||
81 | // This cycle draw all contours and approximate it by ellipses.
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82 | for(;cont;cont = cont->h_next)
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83 | { |
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84 | int i; // Indicator of cycle. |
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85 | int count = cont->total; // This is number point in contour |
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86 | CvPoint center; |
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87 | CvSize size; |
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88 | |||
89 | // Number point must be more than or equal to 6 (for cvFitEllipse_32f).
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90 | if( count < 6 ) |
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91 | continue;
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92 | |||
93 | // Alloc memory for contour point set.
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94 | PointArray = (CvPoint*)malloc( count*sizeof(CvPoint) );
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95 | PointArray2D32f= (CvPoint2D32f*)malloc( count*sizeof(CvPoint2D32f) );
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96 | |||
97 | // Alloc memory for ellipse data.
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98 | box = (CvBox2D32f*)malloc(sizeof(CvBox2D32f));
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99 | |||
100 | // Get contour point set.
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101 | cvCvtSeqToArray(cont, PointArray, CV_WHOLE_SEQ); |
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102 | |||
103 | // Convert CvPoint set to CvBox2D32f set.
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104 | for(i=0; i<count; i++) |
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105 | { |
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106 | PointArray2D32f[i].x = (float)PointArray[i].x;
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107 | PointArray2D32f[i].y = (float)PointArray[i].y;
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108 | } |
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109 | |||
110 | // Fits ellipse to current contour.
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111 | cvFitEllipse(PointArray2D32f, count, box); |
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112 | |||
113 | // Draw current contour.
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114 | cvDrawContours(image04,cont,CV_RGB(255,255,255),CV_RGB(255,255,255),0,1,8,cvPoint(0,0)); |
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115 | |||
116 | // Convert ellipse data from float to integer representation.
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117 | center.x = cvRound(box->center.x); |
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118 | center.y = cvRound(box->center.y); |
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119 | size.width = cvRound(box->size.width*0.5); |
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120 | size.height = cvRound(box->size.height*0.5); |
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121 | box->angle = -box->angle; |
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122 | |||
123 | if (size.width>10&&size.height>10&&size.width<20&&size.height<20){ |
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124 | //printf("%d %d %d %d\n",center.x,center.y,size.width,size.height);
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125 | |||
126 | // Draw ellipse.
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127 | cvEllipse(image04, center, size, |
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128 | box->angle, 0, 360, |
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129 | CV_RGB(0,0,255), 1, CV_AA, 0); |
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130 | } |
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131 | // Free memory.
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132 | free(PointArray); |
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133 | free(PointArray2D32f); |
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134 | free(box); |
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135 | } |
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136 | |||
137 | // Show image. HighGUI use.
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138 | cvShowImage( "Result", image04 );
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139 | } |
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140 | |||
141 | #ifdef _EiC
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142 | main(1,"fitellipse.c"); |
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143 | #endif
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