Name
robertsrobertsRobertsRoberts — Detect edges using the Roberts filter.
robertsrobertsRobertsRobertsRoberts calculates the first derivative of an image
and is used as an edge operator. If the following mask describes a
part of the image,
A B
C D
the different filter types are defined as follows:
'roberts_max' max(| A - D |,| B - C |)
'gradient_max' max(| A + B - (C + D)|,| A + C - (B + D)|)
'gradient_sum' |A + B - (C + D)| + |A + C - (B + D)|
If an overflow occurs the result is clipped. The result of the
operator is stored at the pixel with the coordinates of "D".
Note that filter operators may return unexpected results if
an image with a reduced domain is used as input. Please refer to the
chapter Filters.
- Multithreading type: reentrant (runs in parallel with non-exclusive operators).
- Multithreading scope: global (may be called from any thread).
- Automatically parallelized on tuple level.
- Automatically parallelized on channel level.
- Automatically parallelized on domain level.
Roberts-filtered result images.
Filter type.
Default value:
'gradient_sum'
"gradient_sum"
"gradient_sum"
"gradient_sum"
"gradient_sum"
List of values: 'gradient_max'"gradient_max""gradient_max""gradient_max""gradient_max", 'gradient_sum'"gradient_sum""gradient_sum""gradient_sum""gradient_sum", 'roberts_max'"roberts_max""roberts_max""roberts_max""roberts_max"
read_image(Image,'fabrik')
roberts(Image,Roberts,'roberts_max')
threshold(Roberts,Margin,128,255)
read_image(&Image,"fabrik");
roberts(Image,&Roberts,"roberts_max");
threshold(Roberts,&Margin,128.0,255.0);
read_image(Image,'fabrik')
roberts(Image,Roberts,'roberts_max')
threshold(Roberts,Margin,128,255)
read_image(Image,'fabrik')
roberts(Image,Roberts,'roberts_max')
threshold(Roberts,Margin,128,255)
read_image(Image,'fabrik')
roberts(Image,Roberts,'roberts_max')
threshold(Roberts,Margin,128,255)
robertsrobertsRobertsRobertsRoberts returns 2 (H_MSG_TRUE) if all parameters are
correct. If the input is empty the behavior can be set via
set_system('no_object_result',<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>). If
necessary, an exception is raised.
binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilter,
gauss_filtergauss_filterGaussFilterGaussFilterGaussFilter
thresholdthresholdThresholdThresholdThreshold,
skeletonskeletonSkeletonSkeletonSkeleton
edges_imageedges_imageEdgesImageEdgesImageEdgesImage,
sobel_ampsobel_ampSobelAmpSobelAmpSobelAmp,
frei_ampfrei_ampFreiAmpFreiAmpFreiAmp,
kirsch_ampkirsch_ampKirschAmpKirschAmpKirschAmp,
prewitt_ampprewitt_ampPrewittAmpPrewittAmpPrewittAmp
laplacelaplaceLaplaceLaplaceLaplace,
highpass_imagehighpass_imageHighpassImageHighpassImageHighpassImage,
bandpass_imagebandpass_imageBandpassImageBandpassImageBandpassImage
Foundation