gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus (算子)

名称

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus — 生成均匀离焦模糊的脉冲响应。脉冲响应函数 Psf：impulse response function。

签名

描述

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus generates an impulse response (spatial domain) of an uniform out-of-focus blurring and writes it into an image of HALCON image type real. BlurringBlurringBlurringBlurringblurringblurring specifies the extent of blurring by defining the “blur radius” (out-of-focus blurring maps each image pixel on a small circle with a radius of BlurringBlurringBlurringBlurringblurringblurring - specified in “number of pixels”). If specified less than zero, the absolute value of BlurringBlurringBlurringBlurringblurringblurring is used. The result image of gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus encloses an spatial domain impulse response of the specified blurring. Its representation presumes the origin in the upper left corner. This results in the following disposition of an NxM sized image:

• first rectangle (“upper left”): (image coordinates xb = 0..(N/2)-1, yb = 0..(M/2)-1)

  - conforms to the fourth quadrant of the Cartesian coordinate system, encloses values of the impulse response at position x = 0..N/2 and y = 0..-M/2

• second rectangle (“upper right”): (image coordinates xb = N/2..N-1, yb = 0..(M/2)-1)

  - conforms to the third quadrant of the Cartesian coordinate system, encloses values of the impulse response at position x = -N/2..-1 and y = -1..-M/2

• third rectangle (“lower left”): (image coordinates xb = 0..(N/2)-1, yb = M/2..M-1)

  - conforms to the first quadrant of the Cartesian coordinate system, encloses values of the impulse response at position x = 1..N/2 and y = M/2..0

• fourth rectangle (“lower right”): (image coordinates xb = N/2..N-1, yb = M/2..M-1)

  - conforms to the second quadrant of the Cartesian coordinate system, encloses values of the impulse response at position x = -N/2..-1 and y = M/2..1

This representation conforms to that of the impulse response parameter of the HALCON-operator wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter。So one can use gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus to generate an impulse response for Wiener filtering.

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）。
• 未采用并行化处理。

参数

结果

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus 在所有参数正确时返回 2 ( H_MSG_TRUE )。

可能的前趋

simulate_motionsimulate_motionSimulateMotionSimulateMotionSimulateMotionsimulate_motion, gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotionGenPsfMotiongen_psf_motion

可能的后继

simulate_defocussimulate_defocusSimulateDefocusSimulateDefocusSimulateDefocussimulate_defocus, wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiWienerFilterNiwiener_filter_ni

另见

simulate_defocussimulate_defocusSimulateDefocusSimulateDefocusSimulateDefocussimulate_defocus, gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotionGenPsfMotiongen_psf_motion, simulate_motionsimulate_motionSimulateMotionSimulateMotionSimulateMotionsimulate_motion, wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiWienerFilterNiwiener_filter_ni

参考文献

Reginald L. Lagendijk, Jan Biemond: Iterative Identification and Restoration of Images, Kluwer Academic Publishers Boston/Dordrecht/London, 1991
M. Lückenhaus:“Grundlagen des Wiener-Filters und seine Anwendung in der Bildanalyse”; Diplomarbeit; Technische Universität München, Institut für Informatik; Lehrstuhl Prof. Radig; 1995.

模块

基础