1、等價模式LBP的最初效果

正樣本2343，負樣本5883，直接計算等價模式LBP特征圖，再使用SVM訓練一個分類器。

CvTermCriteria criteria = cvTermCriteria(CV_TERMCRIT_ITER, 1000, FLT_EPSILON);CvSVMParams param(CvSVM::C_SVC, CvSVM::LINEAR, 0, 0.5, 0, 0.01, 0, 0, 0, criteria);

?

2、添加高斯濾波處理

GaussianBlur(inputImg, inputImg, Size(3,3), 0);

結論：加入高斯濾波，由于可去除噪聲干擾；車道線檢出率提高，多檢率降低。

?

3、再把LBP特征計算的像素差值增大至5?

// LBP特征的實現(xiàn)及LBP+SVM分類 https://blog.csdn.net/qianqing13579/article/details/49406563 // 計算等價模式LBP特征圖，為了方便表示特征圖，58種等價模式表示為1~58,第59種混合模式表示為0 static void ComputeLBPImage_Uniform(const Mat &srcImage, Mat &LBPImage) {// 參數(shù)檢查，內(nèi)存分配CV_Assert(srcImage.depth() == CV_8U&&srcImage.channels() == 1);LBPImage.create(srcImage.size(), srcImage.type());// 計算LBP圖// 擴充原圖像邊界，便于邊界處理Mat extendedImage;copyMakeBorder(srcImage, extendedImage, 1, 1, 1, 1, BORDER_DEFAULT);// 構建LBP 等價模式查找表//int table[256];//BuildUniformPatternTable(table);// LUT(256種每一種模式對應的等價模式)static const int table[256] = { 1, 2, 3, 4, 5, 0, 6, 7, 8, 0, 0, 0, 9, 0, 10, 11, 12, 0, 0, 0, 0, 0, 0, 0, 13, 0, 0, 0, 14, 0, 15, 16, 17, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 18, 0, 0, 0, 0, 0, 0, 0, 19, 0, 0, 0, 20, 0, 21, 22, 23, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 24, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 25,0, 0, 0, 0, 0, 0, 0, 26, 0, 0, 0, 27, 0, 28, 29, 30, 31, 0, 32, 0, 0, 0, 33, 0, 0, 0, 0, 0, 0, 0, 34, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 35, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 36, 37, 38, 0, 39, 0, 0, 0, 40, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 42, 43, 44, 0, 45, 0, 0, 0, 46, 0, 0, 0, 0, 0, 0, 0, 47, 48, 49, 0, 50, 0, 0, 0, 51, 52, 53, 0, 54, 55, 56, 57, 58 };// 計算LBPint heightOfExtendedImage = extendedImage.rows;int widthOfExtendedImage = extendedImage.cols;int widthOfLBP=LBPImage.cols;uchar *rowOfExtendedImage = extendedImage.data+widthOfExtendedImage+1;uchar *rowOfLBPImage = LBPImage.data;int pixelDiff = 5;for (int y = 1; y <= heightOfExtendedImage - 2; ++y,rowOfExtendedImage += widthOfExtendedImage, rowOfLBPImage += widthOfLBP){// 列uchar *colOfExtendedImage = rowOfExtendedImage;uchar *colOfLBPImage = rowOfLBPImage;for (int x = 1; x <= widthOfExtendedImage - 2; ++x, ++colOfExtendedImage, ++colOfLBPImage){// 計算LBP值int LBPValue = 0;if (colOfExtendedImage[0 - widthOfExtendedImage - 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 128;if (colOfExtendedImage[0 - widthOfExtendedImage] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 64;if (colOfExtendedImage[0 - widthOfExtendedImage + 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 32;if (colOfExtendedImage[0 + 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 16;if (colOfExtendedImage[0 + widthOfExtendedImage + 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 8;if (colOfExtendedImage[0 + widthOfExtendedImage] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 4;if (colOfExtendedImage[0 + widthOfExtendedImage - 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 2;if (colOfExtendedImage[0 - 1] >= colOfExtendedImage[0]+pixelDiff)LBPValue += 1;colOfLBPImage[0] = table[LBPValue];} // x}// y }

結論：計算LBP編碼值，像素差值取5，可以減少背景細微差異而又滿足車道線特征分布帶來的多檢，整體而言檢測結果更加準確。

總結

以上是生活随笔為你收集整理的【机器学习】改善LBP特征提高SVM的可分性的经验总结（一）的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯，歡迎將生活随笔推薦給好友。