simulate_motion — 仿真（线性）运动模糊。
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 (输入对象) (multichannel-)image(-array) → object (byte / direction / cyclic / int1 / int2 / uint2 / int4 / real)
image to be blurred.
MovedImage (输出对象) image → object (real)
motion blurred image.
Blurring (输入控制) real → (real)
extent of blurring.
默认值： 20.0
建议值： 5.0, 10.0, 20.0, 30.0, 40.0
Angle (输入控制) integer → (integer)
Angle between direction of motion and x-axis (anticlockwise).
默认值： 0
建议值： 0, 45, 90, 180, 270
Type (输入控制) integer → (integer)
impulse response of motion blur.
默认值： 3
值列表： 1, 2, 3, 4, 5
simulate_motion 在所有参数正确时返回 2 ( H_MSG_TRUE )。 如果输入为空，simulate_motion 返回一条错误消息。
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
基础