robinson_amprobinson_ampRobinsonAmpRobinsonAmp (Operator)

Name

robinson_amprobinson_ampRobinsonAmpRobinsonAmp — Detect edges (amplitude) using the Robinson operator.

Signature

Description

robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmp calculates an approximation of the first derivative of the image data and is used as an edge detector. In robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmp the following four of the originally proposed eight 3x3 filter masks are convolved with the image. The other four masks are obtained by a multiplication by -1. All masks contain only the values 0,1,-1,2,-2.

     -1   0   1                2   1   0
     -2   0   2                1   0  -1
     -1   0   1                0  -1  -2

      0   1   2                1   2   1
     -1   0   1                0   0   0
     -2  -1   0               -1  -2  -1

Attention

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.

Execution Information

• 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.

Parameters

read_image(Image,'fabrik')
robinson_amp(Image,Robinson_amp)
threshold(Robinson_amp,Edges,128,255)

read_image(&Image,"fabrik");
robinson_amp(Image,&Robinson_amp);
threshold(Robinson_amp,&Edges,128,255);

read_image(Image,'fabrik')
robinson_amp(Image,Robinson_amp)
threshold(Robinson_amp,Edges,128,255)

read_image(Image,'fabrik')
robinson_amp(Image,Robinson_amp)
threshold(Robinson_amp,Edges,128,255)

read_image(Image,'fabrik')
robinson_amp(Image,Robinson_amp)
threshold(Robinson_amp,Edges,128,255)

Result

robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmp always returns 2 (H_MSG_TRUE). 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.

Possible Predecessors

binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilter, gauss_filtergauss_filterGaussFilterGaussFilterGaussFilter, sigma_imagesigma_imageSigmaImageSigmaImageSigmaImage, median_imagemedian_imageMedianImageMedianImageMedianImage, smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImage

Alternatives

sobel_ampsobel_ampSobelAmpSobelAmpSobelAmp, frei_ampfrei_ampFreiAmpFreiAmpFreiAmp, prewitt_ampprewitt_ampPrewittAmpPrewittAmpPrewittAmp, robertsrobertsRobertsRobertsRoberts

See also

bandpass_imagebandpass_imageBandpassImageBandpassImageBandpassImage, laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGauss

Module

Foundation