simulate_motion — Simulation of (linearly) motion blur.
simulate_motion(Image : MovedImage : Blurring, Angle, Type : )
simulate_motion simulates blurring caused by a relative motion
between the object and the camera during exposure. The simulated motion
moves along an even. Angle fixes its direction by specifying
the angle between the motion direction and the x-axis (anticlockwise,
measured in degrees).
Simulation is done by a convolution of the image with a blurring specific
impulse response. The convolution is realized by multiplication in the
Fourier domain.
simulate_motion offers five prototypes of impulse responses
conforming to different acceleration behaviors. Type allows
to choose one of the following PSF prototypes:
reverse ramp (crude model for acceleration)
reverse trapezoid (crude model for high acceleration)
square pulse (exact model for constant velocity), this is default
forward trapezoid (crude model for deceleration)
forward ramp (crude model for high deceleration)
(default value is 3.)
The simulated blurring affects all part of the image uniformly.
Blurring controls the extent of blurring. It specifies the
number of pixels (lying one after another) that are affected by the
blurring. This number is determined by velocity of the motion and
exposure time. If Blurring is a negative number, an adequate
blurring in reverse direction is simulated. If Angle is a
negative number, it is interpreted clockwise. If Angle exceeds
360 or falls below -360, it is transformed modulo(360) in an adequate number
between [0..360] resp. [-360..0].
Image (input_object) (multichannel-)image(-array) → object (byte / direction / cyclic / int1 / int2 / uint2 / int4 / real)
image to be blurred.
MovedImage (output_object) image → object (real)
motion blurred image.
Blurring (input_control) real → (real)
extent of blurring.
Default value: 20.0
Suggested values: 5.0, 10.0, 20.0, 30.0, 40.0
Angle (input_control) integer → (integer)
Angle between direction of motion and x-axis (anticlockwise).
Default value: 0
Suggested values: 0, 45, 90, 180, 270
Type (input_control) integer → (integer)
impulse response of motion blur.
Default value: 3
List of values: 1, 2, 3, 4, 5
simulate_motion returns 2 (H_MSG_TRUE) if all parameters are
correct. If the input is empty simulate_motion returns with
an error message.
gen_psf_motion,
gen_psf_motion
simulate_defocus,
wiener_filter,
wiener_filter_ni
gen_psf_motion,
simulate_defocus,
gen_psf_defocus
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
Foundation