robinson_amprobinson_ampRobinsonAmpRobinsonAmprobinson_amp (Operator)

Name

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

Signature

Description

robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmprobinson_amp calculates an approximation of the first derivative of the image data and is used as an edge detector. In robinson_amprobinson_ampRobinsonAmpRobinsonAmpRobinsonAmprobinson_amp 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 The result image contains the maximum response of all masks.

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_ampRobinsonAmpRobinsonAmpRobinsonAmprobinson_amp 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>)set_system("no_object_result",<Result>). If necessary, an exception is raised.

Possible Predecessors

binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilterbinomial_filter, gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter, sigma_imagesigma_imageSigmaImageSigmaImageSigmaImagesigma_image, median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImagesmooth_image

Alternatives

sobel_ampsobel_ampSobelAmpSobelAmpSobelAmpsobel_amp, frei_ampfrei_ampFreiAmpFreiAmpFreiAmpfrei_amp, prewitt_ampprewitt_ampPrewittAmpPrewittAmpPrewittAmpprewitt_amp, robertsrobertsRobertsRobertsRobertsroberts

See also

bandpass_imagebandpass_imageBandpassImageBandpassImageBandpassImagebandpass_image, laplace_of_gausslaplace_of_gaussLaplaceOfGaussLaplaceOfGaussLaplaceOfGausslaplace_of_gauss

Module

Foundation