gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotiongen_psf_motion (算子)

名称

gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotiongen_psf_motion — 生成（线性）运动模糊的脉冲响应。

签名

描述

gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotionGenPsfMotiongen_psf_motion generates an impulse response (spatial domain) of a blurring caused by a relative motion between the object and the camera during exposure. The generated impulse response is output into an image of HALCON image type real. PSFwidthPSFwidthPSFwidthPSFwidthPSFwidthpsfwidth and PSFheightPSFheightPSFheightPSFheightPSFheightpsfheight define the width and height of the output image. The blurring motion moves along an even. AngleAngleAngleAngleangleangle fixes its direction by specifying the angle between the motion direction and the x-axis (anticlockwise, measured in degrees). To specify different velocity behavior five PSF prototypes can be generated. TypeTypeTypeTypetypetype switches between the following prototypes:

1. reverse ramp (crude model for acceleration)

2. reverse trapezoid (crude model for high acceleration)

3. square pulse (exact model for constant velocity), this is default

4. forward trapezoid (crude model for deceleration)

5. forward ramp (crude model for high deceleration)

(default value is 3.)

The blurring affects all part of the image uniformly. BlurringBlurringBlurringBlurringblurringblurring controls the extent of blurring. It specifies the number of pixels (lying one after another) that are affetcetd by the blurring. This number is determined by velocity of the motion and exposure time. If BlurringBlurringBlurringBlurringblurringblurring is a negative number, an adequate blurring in reverse direction is simulated. If AngleAngleAngleAngleangleangle is a negative number, it is interpreted clockwise. If AngleAngleAngleAngleangleangle exceeds 360 or falls below -360, it is transformed modulo(360) in an adequate number between [0..360] resp. [-360..0]. The result image of gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotionGenPsfMotiongen_psf_motion 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_motiongen_psf_motionGenPsfMotionGenPsfMotionGenPsfMotiongen_psf_motion to generate an impulse response for Wiener filtering a motion blurred image.

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

可能的前趋

simulate_defocussimulate_defocusSimulateDefocusSimulateDefocusSimulateDefocussimulate_defocus, gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus

可能的后继

simulate_motionsimulate_motionSimulateMotionSimulateMotionSimulateMotionsimulate_motion, wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiWienerFilterNiwiener_filter_ni

另见

simulate_motionsimulate_motionSimulateMotionSimulateMotionSimulateMotionsimulate_motion, simulate_defocussimulate_defocusSimulateDefocusSimulateDefocusSimulateDefocussimulate_defocus, gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusGenPsfDefocusgen_psf_defocus, wiener_filterwiener_filterWienerFilterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiWienerFilterNiwiener_filter_ni

参考文献

Anil K. Jain:Fundamentals of Digital Image Processing, Prentice-Hall International Inc., Englewood Cliffs, New Jersey, 1989
M. Lückenhaus:“Grundlagen des Wiener-Filters und seine Anwendung in der Bildanalyse”; Diplomarbeit; Technische Universität München, Institut für Informatik; Lehrstuhl Prof. Radig; 1995.
Kha-Chye Tan, Hock Lim, B. T. G. Tan:“Restoration of Real-World Motion-Blurred Images”;S. 291-299 in: CVGIP Graphical Models and Image Processing, Vol. 53, No. 3, May 1991

模块

基础

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