使用Qwt在点云上绘制样条曲线

Question

我有一组点，我想沿着一组点绘制样条线。我写了代码

QwtSplineCurveFitter curveFitter;
QPolygonF splinecurve = curveFitter.fitCurve(QPolygonF(whitepixels));
std::vector<cv::Point2d> polygonpoints ;
while(iter != splinecurve.end())
{
    polygonpoints.push_back(cv::Point2d(iter->x(),iter->y()));
    ++iter;
}
std::vector<cv::Point2d>::iterator itr = polygonpoints.begin();
cv::Point2d firstpoint;
cv::Mat whitemask;
whitemask = cv::Scalar::all(255);
while (itr != polygonpoints.end())
{
    if(*itr == polygonpoints.front())
    {
        firstpoint = *itr;
    }
    else
    {
        cv::line(img, firstpoint, *itr, cv::Scalar(0,255,0), 1);
        firstpoint = *itr;
    }
    ++itr;
}
cv::imshow("newline",whitemask);
cv::waitKey(0);

但是获得这样的图像。我想沿着这些点绘制样条曲线

用于绘制样条线的点

 x: 615 y:  807 

 x: 616 y:  808.41 

 x: 617 y:  805.848 

 x: 617.476 y:  808.845 

 x: 618 y:  810.786 

 x: 618.69 y:  806.306 

 x: 619 y:  811.735 

 x: 619.472 y:  811.043 

 x: 620 y:  808.69 

 x: 620.053 y:  820.387 

 x: 620.976 y:  802.451 

 x: 621 y:  815.143 

 x: 621.312 y:  817.39 

 x: 622 y:  806.102 

 x: 622 y:  819.597 

 x: 622.433 y:  815.76 

 x: 623 y:  806.559 

 x: 623 y:  820.054 

 x: 623.324 y:  820.59 

 x: 624 y:  807.018 

 x: 624 y:  820.511 

 x: 624.223 y:  825.097 

 x: 624.996 y:  807.633 

 x: 625 y:  820.969 

 x: 625.134 y:  829.079 

 x: 625.964 y:  809.359 

 x: 626 y:  821.426 

 x: 626.065 y:  832.334 

 x: 626.907 y:  812.125 

 x: 627 y:  821.883 

 x: 627.018 y:  834.659 

 x: 627.828 y:  815.731 

 x: 628 y:  822.34 

 x: 628 y:  835.853 

 x: 628.733 y:  819.973 

 x: 629 y:  822.797 

 x: 629 y:  836.287 

 x: 629.628 y:  824.65 

 x: 630 y:  823.254 

 x: 630 y:  836.748 

 x: 630.517 y:  829.559 

 x: 631 y:  823.712 

 x: 631 y:  837.205 

 x: 631.405 y:  834.499 

 x: 632 y:  824.167 

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 x: 632.512 y:  832.728 

 x: 633 y:  828.623 

 x: 633 y:  842.115 

 x: 633.704 y:  830.236 

 x: 634 y:  833.077 

 x: 634.004 y:  846.392 

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 x: 638 y:  834.905 

 x: 638 y:  848.4 

 x: 638.348 y:  847.978 

 x: 639 y:  835.37 

 x: 639 y:  848.857 

 x: 639.244 y:  852.575 

 x: 639.999 y:  835.857 

 x: 640 y:  849.314 

 x: 640.153 y:  856.692 

 x: 640.974 y:  837.322 

 x: 641 y:  849.771 

 x: 641.078 y:  860.127 

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 x: 651.999 y:  874.79 

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 x: 653.683 y:  867.426 

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 x: 655 y:  873.614 

 x: 655.455 y:  875.27 

 x: 656 y:  874.564 

 x: 656.341 y:  879.18 

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 x: 675 y:  918.547 

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 x: 676 y:  911.504 

 x: 676 y:  925 

 x: 676.666 y:  915.826 

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 x: 677.027 y:  930.549 

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 x: 678.258 y:  928.6 

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 x: 706 y:  977.18 

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 x: 708 y:  976

Answer 1

样条插值在Qwt 6.1中无法正常工作，但是当使用Qwt> = 6.2时，您会发现各种样条插值/逼近算法的全新实现。