dots_imagedots_imageDotsImageDotsImagedots_image (算子)

名称

dots_imagedots_imageDotsImageDotsImagedots_image — 增强图像中的圆点。

签名

描述

dots_imagedots_imageDotsImageDotsImageDotsImagedots_image enhances circular dots of diameter DiameterDiameterDiameterDiameterdiameterdiameter in the input image ImageImageImageImageimageimage. Hence, dots_imagedots_imageDotsImageDotsImageDotsImagedots_image is especially suited for the segmentation of dot prints, e.g., in OCR applications. The enhancement is performed by using matched filters with filter masks that are tuned for a particular dot size. For example, for DiameterDiameterDiameterDiameterdiameterdiameter = 5 the filter mask is given by: The parameter FilterTypeFilterTypeFilterTypeFilterTypefilterTypefilter_type selects whether 'dark'"dark""dark""dark""dark""dark", 'light'"light""light""light""light""light", or 'all'"all""all""all""all""all" dots in the image should be enhanced. The PixelShiftPixelShiftPixelShiftPixelShiftpixelShiftpixel_shift can be used either to increase the contrast of the output image (PixelShiftPixelShiftPixelShiftPixelShiftpixelShiftpixel_shift > 0) or to dampen the values in extremely bright areas that would be cut off otherwise (PixelShiftPixelShiftPixelShiftPixelShiftpixelShiftpixel_shift = -1).

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）。
• 在元组级别上自动并行化。
• 在通道级别上自动并行化。
• 在域级别上自动并行化。

参数

可能的后继

thresholdthresholdThresholdThresholdThresholdthreshold

替代

laplacelaplaceLaplaceLaplaceLaplacelaplace, laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGausslaplace_of_gauss, diff_of_gaussdiff_of_gaussDiffOfGaussDiffOfGaussDiffOfGaussdiff_of_gauss, derivate_gaussderivate_gaussDerivateGaussDerivateGaussDerivateGaussderivate_gauss, convol_imageconvol_imageConvolImageConvolImageConvolImageconvol_image

模块

基础