利用SVM解决2维空间向量的3级分类问题
【原文:http://blog.csdn.net/firefight/article/details/6400060】 为了学习OPENCV SVM分类器, 参考网上的 利用SVM解决2维空间向量的分类问题 实现并改为C代码,仅供参考 环境:OPENCV2.2 VS2008 步骤: 1,生成随机的点,并按一定的空间分布将其归类 2,
【原文:http://blog.csdn.net/firefight/article/details/6400060】
为了学习OPENCV SVM分类器, 参考网上的"利用SVM解决2维空间向量的分类问题"实现并改为C++代码,仅供参考
环境:OPENCV2.2 + VS2008
步骤:
1,生成随机的点,并按一定的空间分布将其归类
2,创建SVM并利用随机点样本进行训练
3,将整个空间按SVM分类结果进行划分,并显示支持向量
[cpp] view plaincopy
- #include "stdafx.h"
-
#include
- void drawCross(Mat &img, Point center, Scalar color)
- {
- int col = center.x > 2 ? center.x : 2;
- int row = center.y> 2 ? center.y : 2;
- line(img, Point(col -2, row - 2), Point(col + 2, row + 2), color);
- line(img, Point(col + 2, row - 2), Point(col - 2, row + 2), color);
- }
- int newSvmTest(int rows, int cols, int testCount)
- {
- if(testCount > rows * cols)
- return 0;
- Mat img = Mat::zeros(rows, cols, CV_8UC3);
- Mat testPoint = Mat::zeros(rows, cols, CV_8UC1);
- Mat data = Mat::zeros(testCount, 2, CV_32FC1);
- Mat res = Mat::zeros(testCount, 1, CV_32SC1);
- //Create random test points
- for (int i= 0; i
- {
- int row = rand() % rows;
- int col = rand() % cols;
-
if(testPoint.at
char>(row, col) == 0) - {
-
testPoint.at
char >(row, col) = 1; - data.atfloat>(i, 0) = float (col) / cols;
- data.atfloat>(i, 1) = float (row) / rows;
- }
- else
- {
- i--;
- continue;
- }
- if (row > ( 50 * cos(col * CV_PI/ 100) + 200) )
- {
- drawCross(img, Point(col, row), CV_RGB(255, 0, 0));
-
res.at
int >(i, 0) = 1; - }
- else
- {
- if (col > 200)
- {
- drawCross(img, Point(col, row), CV_RGB(0, 255, 0));
-
res.at
int >(i, 0) = 2; - }
- else
- {
- drawCross(img, Point(col, row), CV_RGB(0, 0, 255));
-
res.at
int >(i, 0) = 3; - }
- }
- }
- //Show test points
- imshow("dst", img);
- waitKey(0);
- /////////////START SVM TRAINNING//////////////////
- CvSVM svm = CvSVM();
- CvSVMParams param;
- CvTermCriteria criteria;
- criteria= cvTermCriteria(CV_TERMCRIT_EPS, 1000, FLT_EPSILON);
-
/* SVM种类:CvSVM::C_SVC
Kernel的种类:CvSVM::RBF
degree:10.0(此次不使用)
gamma:8.0
coef0:1.0(此次不使用)
C:10.0
nu:0.5(此次不使用)
p:0.1(此次不使用)
然后对训练数据正规化处理,并放在CvMat型的数组里。*/
- param= CvSVMParams (CvSVM::C_SVC, CvSVM::RBF, 10.0, 8.0, 1.0, 10.0, 0.5, 0.1, NULL, criteria);
- svm.train(data, res, Mat(), Mat(), param);
- for (int i= 0; i
- {
- for (int j= 0; j
- {
- Mat m = Mat::zeros(1, 2, CV_32FC1);
- m.atfloat>(0,0) = float (j) / cols;
- m.atfloat>(0,1) = float (i) / rows;
- float ret = 0.0;
- ret = svm.predict(m);
- Scalar rcolor;
- switch ((int) ret)
- {
- case 1: rcolor= CV_RGB(100, 0, 0); break;
- case 2: rcolor= CV_RGB(0, 100, 0); break;
- case 3: rcolor= CV_RGB(0, 0, 100); break;
- }
- line(img, Point(j,i), Point(j,i), rcolor);
- }
- }
- imshow("dst", img);
- waitKey(0);
- //Show support vectors
- int sv_num= svm.get_support_vector_count();
- for (int i= 0; i
- {
- const float* support = svm.get_support_vector(i);
- circle(img, Point((int) (support[0] * cols), (int) (support[1] * rows)), 5, CV_RGB(200, 200, 200));
- }
- imshow("dst", img);
- waitKey(0);
- return 0;
- }
- int main(int argc, char** argv)
- {
- return newSvmTest(400, 600, 100);
- }
学习样本:
分类:
支持向量:

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