opencv svm分类
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void svm(){ // 视觉表达数据的设置 int width = 512, height = 512; Mat image = Mat::zeros(height, width, CV_8UC3); //建立训练数据 int labels[4] = { 1, -1, -1, -1 }; Mat labelsMat(4, 1, CV_32SC1, labels); InputArray svmOutput(labelsMat); float trainingData[4][2] = { { 501, 10 },{ 255, 10 },{ 501, 255 },{ 10, 501 } }; Mat trainingDataMat(4, 2, CV_32FC1, trainingData); InputArray svmInput(trainingDataMat); //设置支持向量机的参数 Ptr<SVM> svm = SVM::create(); svm->setType(SVM::C_SVC); svm->setKernel(SVM::LINEAR); svm->setTermCriteria(TermCriteria(TermCriteria::MAX_ITER, 100, 1e-6)); // 训练支持向量机 svm->train(svmInput, ROW_SAMPLE, svmOutput); Vec3b green(0, 255, 0), blue(255, 0, 0); //显示由SVM给出的决定区域 for (int i = 0; i < image.rows; ++i) for (int j = 0; j < image.cols; ++j) { Mat sampleMat = (Mat_<float>(1, 2) << j, i); float response = svm->predict(sampleMat); if (response == 1) image.at<Vec3b>(i, j) = green; else if (response == -1) image.at<Vec3b>(i, j) = blue; } //显示训练数据 int thickness = -1; int lineType = 8; circle(image, Point(501, 10), 5, Scalar(0, 0, 0), thickness, lineType); circle(image, Point(255, 10), 5, Scalar(255, 255, 255), thickness, lineType); circle(image, Point(501, 255), 5, Scalar(255, 255, 255), thickness, lineType); circle(image, Point(10, 501), 5, Scalar(255, 255, 255), thickness, lineType); //显示支持向量 thickness = 2; lineType = 8; Mat sv = svm->getSupportVectors(); for (int i = 0; i < sv.rows; ++i) { const float* v = sv.ptr<float>(i); circle(image, Point((int)v[0], (int)v[1]), 6, Scalar(128, 128, 128), thickness, lineType); } imwrite("result.png", image); // 保存图像 imshow("SVM Simple Example", image); // 显示图像 waitKey(0); return ;}void svm2(){ #define NTRAINING_SAMPLES 100 // 每类训练样本的数量 #define FRAC_LINEAR_SEP 0.9f // 部分(Fraction)线性可分的样本组成部分 //设置视觉表达的参数 const int WIDTH = 512, HEIGHT = 512; Mat I = Mat::zeros(HEIGHT, WIDTH, CV_8UC3); //随机建立训练数据 Mat trainData(2 * NTRAINING_SAMPLES, 2, CV_32FC1); InputArray svmInput(trainData); Mat labels(2 * NTRAINING_SAMPLES, 1, CV_32SC1); InputArray svmOutput(labels); RNG rng(100); // 随机生成值 //建立训练数据的线性可分的组成部分 int nLinearSamples = (int)(FRAC_LINEAR_SEP * NTRAINING_SAMPLES); // 为Class1生成随机点 Mat trainClass = trainData.rowRange(0, nLinearSamples); // 点的x坐标为[0,0.4) Mat c = trainClass.colRange(0, 1); rng.fill(c, RNG::UNIFORM, Scalar(1), Scalar(0.4 * WIDTH)); // 点的Y坐标为[0,1) c = trainClass.colRange(1, 2); rng.fill(c, RNG::UNIFORM, Scalar(1), Scalar(HEIGHT)); // 为Class2生成随机点 trainClass = trainData.rowRange(2 * NTRAINING_SAMPLES - nLinearSamples, 2 * NTRAINING_SAMPLES); // 点的x坐标为[0.6, 1] c = trainClass.colRange(0, 1); rng.fill(c, RNG::UNIFORM, Scalar(0.6*WIDTH), Scalar(WIDTH)); // 点的Y坐标为[0, 1) c = trainClass.colRange(1, 2); rng.fill(c, RNG::UNIFORM, Scalar(1), Scalar(HEIGHT)); //建立训练数据的非线性可分组成部分 // 随机生成Class1和Class2的点 trainClass = trainData.rowRange(nLinearSamples, 2 * NTRAINING_SAMPLES - nLinearSamples); // 点的x坐标为[0.4, 0.6) c = trainClass.colRange(0, 1); rng.fill(c, RNG::UNIFORM, Scalar(0.4*WIDTH), Scalar(0.6*WIDTH)); // 点的y坐标为[0, 1) c = trainClass.colRange(1, 2); rng.fill(c, RNG::UNIFORM, Scalar(1), Scalar(HEIGHT)); //为类设置标签 labels.rowRange(0, NTRAINING_SAMPLES).setTo(1); // Class 1 labels.rowRange(NTRAINING_SAMPLES, 2 * NTRAINING_SAMPLES).setTo(2); // Class 2 //设置支持向量机的参数 Ptr<SVM> svm = SVM::create(); svm->setType(SVM::C_SVC); svm->setKernel(SVM::LINEAR); svm->setC(0.1); svm->setTermCriteria(TermCriteria(TermCriteria::MAX_ITER, (int)1e7, 1e-6)); //训练支持向量机 cout << "Starting training process" << endl; svm->train(svmInput, ROW_SAMPLE, svmOutput); cout << "Finished training process" << endl; //标出决策区域 Vec3b green(0, 100, 0), blue(100, 0, 0); for (int i = 0; i < I.rows; ++i) for (int j = 0; j < I.cols; ++j) { Mat sampleMat = (Mat_<float>(1, 2) << i, j); float response = svm->predict(sampleMat); if (response == 1) I.at<Vec3b>(j, i) = green; else if (response == 2) I.at<Vec3b>(j, i) = blue; } //显示训练数据 int thick = -1; int lineType = 8; float px, py; // Class 1 for (int i = 0; i < NTRAINING_SAMPLES; ++i) { px = trainData.at<float>(i, 0); py = trainData.at<float>(i, 1); circle(I, Point((int)px, (int)py), 3, Scalar(0, 255, 0), thick, lineType); } // Class 2 for (int i = NTRAINING_SAMPLES; i <2 * NTRAINING_SAMPLES; ++i) { px = trainData.at<float>(i, 0); py = trainData.at<float>(i, 1); circle(I, Point((int)px, (int)py), 3, Scalar(255, 0, 0), thick, lineType); } //显示支持向量 thick = 2; lineType = 8; Mat sv = svm->getSupportVectors(); for (int i = 0; i < sv.rows; ++i) { const float* v = sv.ptr<float>(i); circle(I, Point((int)v[0], (int)v[1]), 6, Scalar(128, 128, 128), thick, lineType); } imwrite("result.png", I); //保存图像到文件 imshow("SVM for Non-Linear Training Data", I); // 显示最终窗口 waitKey(0); return ;}
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