zero_crossingzero_crossingZeroCrossingZeroCrossingzero_crossing (算子)

名称

zero_crossingzero_crossingZeroCrossingZeroCrossingzero_crossing — 从图像中提取零交叉点。

签名

描述

zero_crossingzero_crossingZeroCrossingZeroCrossingZeroCrossingzero_crossing returns the zero crossings of the input image as a region. A pixel is accepted as a zero crossing if its gray value (in ImageImageImageImageimageimage) is zero, or if at least one of its neighbors of the 4-neighborhood has a different sign.

This operator is intended to be used after edge operators returning the second derivative of the image (e.g., laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGausslaplace_of_gauss), which were possibly followed by a smoothing operator. In this case, the zero crossings are (candidates for) edges.

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）。
• 在元组级别上自动并行化。
• 在域级别上自动并行化。

参数

结果

zero_crossingzero_crossingZeroCrossingZeroCrossingZeroCrossingzero_crossing usually returns the value 2 ( H_MSG_TRUE) 。如有必要，则抛出异常。

可能的前趋

laplacelaplaceLaplaceLaplaceLaplacelaplace, laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGausslaplace_of_gauss, derivate_gaussderivate_gaussDerivateGaussDerivateGaussDerivateGaussderivate_gauss

可能的后继

connectionconnectionConnectionConnectionConnectionconnection, skeletonskeletonSkeletonSkeletonSkeletonskeleton, boundaryboundaryBoundaryBoundaryBoundaryboundary, select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape, fill_upfill_upFillUpFillUpFillUpfill_up

替代

thresholdthresholdThresholdThresholdThresholdthreshold, dual_thresholddual_thresholdDualThresholdDualThresholdDualThresholddual_threshold, zero_crossing_sub_pixzero_crossing_sub_pixZeroCrossingSubPixZeroCrossingSubPixZeroCrossingSubPixzero_crossing_sub_pix

模块

基础