points_lepetitT_points_lepetitPointsLepetitPointsLepetitpoints_lepetit (算子)

名称

points_lepetitT_points_lepetitPointsLepetitPointsLepetitpoints_lepetit — 使用勒佩蒂特（Lepetit）算子检测兴趣点。

签名

描述

points_lepetitpoints_lepetitPointsLepetitPointsLepetitPointsLepetitpoints_lepetit extracts points of interest like corners or blob-like structures from ImageImageImageImageimageimage. The ImageImageImageImageimageimage is first smoothed with a median of size 3x3. Then, all the gray values on a circle with radius RadiusRadiusRadiusRadiusradiusradius around an interest point candidate (m) are examined. The absolute differences of two diagonally opposed gray values (m1,m2) on the circle to the central pixel m is computed. At least one of these differences has to be larger than MinCheckNeighborDiffMinCheckNeighborDiffMinCheckNeighborDiffMinCheckNeighborDiffminCheckNeighborDiffmin_check_neighbor_diff. All diagonally opposed pixels on the circle must fulfill that condition. To suppress detection of points at edges that have a small curvature (aliasing), it is possible to compute CheckNeighborCheckNeighborCheckNeighborCheckNeighborcheckNeighborcheck_neighbor further differences of circle point neighbors of m1 and m2 to the center, that as well fulfill the above criteria. By computing all gray value differences of the circle points to the center, a mean gray value difference is determined. That value has to be larger than MinScoreMinScoreMinScoreMinScoreminScoremin_score and allows to restrict the results to points with high contrast. By computing the score of all eight neighbors of m, it is possible to fit a quadratic equation to that. The maxima of that equation determines a subpixel accurate interest point position. By setting the parameter SubpixSubpixSubpixSubpixsubpixsubpix to 'interpolation' (default) or 'none', it is possible to turn that refinement step on or off. The resulting points are returned in RowRowRowRowrowrow and ColumnColumnColumnColumncolumncolumn. The operator points_lepetitpoints_lepetitPointsLepetitPointsLepetitPointsLepetitpoints_lepetit can especially be used for very fast interest point extraction. The results are however less robust than points extracted by points_harrispoints_harrisPointsHarrisPointsHarrisPointsHarrispoints_harris for example.

注意

请注意，若使用域缩减后的图像作为输入，滤波器算子可能会返回意外结果。请参阅 滤波器 一章

执行信息

• 多线程类型：可重入（与非独占算子并行运行）。
• 多线程作用域：全局（可从任何线程调用）。
• 在域级别上自动并行化。

参数

可能的前趋

gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter

替代

points_foerstnerpoints_foerstnerPointsFoerstnerPointsFoerstnerPointsFoerstnerpoints_foerstner, points_harrispoints_harrisPointsHarrisPointsHarrisPointsHarrispoints_harris, points_harris_binomialpoints_harris_binomialPointsHarrisBinomialPointsHarrisBinomialPointsHarrisBinomialpoints_harris_binomial, points_sojkapoints_sojkaPointsSojkaPointsSojkaPointsSojkapoints_sojka

模块

基础