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43 // This original code was written by
46 // University of North Carolina at Charlotte
48 #include "precomp.hpp"
50 typedef double polyfit_type;
52 void cv::polyfit(const Mat& src_x, const Mat& src_y, Mat& dst, int order)
54 const int wdepth = DataType<polyfit_type>::depth;
55 int npoints = src_x.checkVector(1);
56 int nypoints = src_y.checkVector(1);
58 CV_Assert(npoints == nypoints && npoints >= order+1);
60 Mat srcX = Mat_<polyfit_type>(src_x), srcY = Mat_<polyfit_type>(src_y);
62 Mat X = Mat::zeros(order + 1, npoints, wdepth);
63 polyfit_type* pSrcX = (polyfit_type*)srcX.data;
64 polyfit_type* pXData = (polyfit_type*)X.data;
65 int stepX = (int)(X.step/X.elemSize1());
66 for (int y = 0; y < order + 1; ++y)
68 for (int x = 0; x < npoints; ++x)
73 pXData[x + stepX] = pSrcX[x];
74 else pXData[x + y*stepX] = pSrcX[x]* pXData[x + (y-1)*stepX];
79 mulTransposed(X, A, false);
81 solve(A, b, w, DECOMP_SVD);
82 w.convertTo(dst, std::max(std::max(src_x.depth(), src_y.depth()), CV_32F));