gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus (Operator)

Name

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus — Generate an impulse response of an uniform out-of-focus blurring.

Signature

gen_psf_defocus( : Psf : PSFwidth, PSFheight, Blurring : )

Description

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_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. BlurringBlurringBlurringblurringblurring 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 BlurringBlurringBlurringblurringblurring - specified in “number of pixels”). If specified less than zero, the absolute value of BlurringBlurringBlurringblurringblurring is used. The result image of gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_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_filterWienerFilterWienerFilterwiener_filter. So one can use gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus to generate an impulse response for Wiener filtering.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

Parameters

PsfPsfPsfpsfpsf (output_object) image → object (real)

Impulse response of uniform out-of-focus blurring.

PSFwidthPSFwidthPSFwidthPSFwidthpsfwidth (input_control) integer → (integer)

Width of result image.

Default: 256

Suggested values: 128, 256, 512, 1024

Value range: 1 ≤ PSFwidth PSFwidth PSFwidth PSFwidth psfwidth

PSFheightPSFheightPSFheightPSFheightpsfheight (input_control) integer → (integer)

Height of result image.

Default: 256

Suggested values: 128, 256, 512, 1024

Value range: 1 ≤ PSFheight PSFheight PSFheight PSFheight psfheight

BlurringBlurringBlurringblurringblurring (input_control) real → (real)

Degree of Blurring.

Default: 5.0

Suggested values: 1.0, 5.0, 10.0, 15.0, 18.0

Result

gen_psf_defocusgen_psf_defocusGenPsfDefocusGenPsfDefocusgen_psf_defocus returns 2 ( H_MSG_TRUE) if all parameters are correct.

Possible Predecessors

simulate_motionsimulate_motionSimulateMotionSimulateMotionsimulate_motion, gen_psf_motiongen_psf_motionGenPsfMotionGenPsfMotiongen_psf_motion

Possible Successors

simulate_defocussimulate_defocusSimulateDefocusSimulateDefocussimulate_defocus, wiener_filterwiener_filterWienerFilterWienerFilterwiener_filter, wiener_filter_niwiener_filter_niWienerFilterNiWienerFilterNiwiener_filter_ni

References

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.

Module

Foundation

Operators