regiongrowingregiongrowingRegiongrowingRegiongrowingregiongrowing (算子名称)

名称

regiongrowingregiongrowingRegiongrowingRegiongrowingregiongrowing — Segment an image using regiongrowing.

参数签名

描述

regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing segments images into regions of the same intensity - rastered into rectangles of size RasterHeightRasterHeightRasterHeightRasterHeightrasterHeightraster_height RasterWidthRasterWidthRasterWidthRasterWidthrasterWidthraster_width. In order to decide whether two adjacent rectangles belong to the same region only the gray value of their center points is used. If the gray value difference is less then or equal to ToleranceToleranceToleranceTolerancetolerancetolerance the rectangles are merged into one region.

If and are two gray values to be examined, they are merged into the same region if: For images of type 'cyclic', the following formulas are used:

For rectangles larger than one pixel, usually the images should be smoothed with a lowpass filter with a size of at least RasterHeightRasterHeightRasterHeightRasterHeightrasterHeightraster_height RasterWidthRasterWidthRasterWidthRasterWidthrasterWidthraster_width before calling regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing (so that the gray values at the centers of the rectangles are “representative” for the whole rectangle). If the image contains little noise and the rectangles are small, the smoothing can be omitted in many cases.

The resulting regions are collections of rectangles of the chosen size RasterHeightRasterHeightRasterHeightRasterHeightrasterHeightraster_height RasterWidthRasterWidthRasterWidthRasterWidthrasterWidthraster_width. Only regions containing at least MinSizeMinSizeMinSizeMinSizeminSizemin_size points are returned.

Regiongrowing is a very fast operation, and thus suited for time-critical applications.

注意

RasterWidthRasterWidthRasterWidthRasterWidthrasterWidthraster_width and RasterHeightRasterHeightRasterHeightRasterHeightrasterHeightraster_height are automatically converted to odd values if necessary.

运行信息

• Multithreading type: reentrant (runs in parallel with non-exclusive operators).
• Multithreading scope: global (may be called from any thread).
• Automatically parallelized on tuple level.

参数表

read_image(Image,'fabrik')
mean_image(Image,Mean,RasterHeight,RasterWidth)
regiongrowing(Mean,Result,RasterHeight,RasterWidth,6.0,100)

read_image(&Image,"fabrik");
mean_image(Image,&Mean,RasterHeight,RasterWidth);
regiongrowing(Mean,&Result,RasterHeight,RasterWidth,6,100);

read_image(Image,'fabrik')
mean_image(Image,Mean,RasterHeight,RasterWidth)
regiongrowing(Mean,Result,RasterHeight,RasterWidth,6.0,100)

read_image(Image,'fabrik')
mean_image(Image,Mean,RasterHeight,RasterWidth)
regiongrowing(Mean,Result,RasterHeight,RasterWidth,6.0,100)

read_image(Image,'fabrik')
mean_image(Image,Mean,RasterHeight,RasterWidth)
regiongrowing(Mean,Result,RasterHeight,RasterWidth,6.0,100)

Complexity

Let N be the number of found regions and M the number of points in one of these regions. Then the runtime complexity is O(N * log(M) * M).

结果

regiongrowingregiongrowingRegiongrowingRegiongrowingRegiongrowingregiongrowing returns 2 ( H_MSG_TRUE) if all parameters are correct. The behavior with respect to the input images and output regions can be determined by setting the values of the flags 'no_object_result'"no_object_result""no_object_result""no_object_result""no_object_result""no_object_result", 'empty_region_result'"empty_region_result""empty_region_result""empty_region_result""empty_region_result""empty_region_result", and 'store_empty_region'"store_empty_region""store_empty_region""store_empty_region""store_empty_region""store_empty_region" with set_systemset_systemSetSystemSetSystemSetSystemset_system. If necessary, an exception is raised.

可能的前置算子

binomial_filterbinomial_filterBinomialFilterBinomialFilterBinomialFilterbinomial_filter, mean_imagemean_imageMeanImageMeanImageMeanImagemean_image, gauss_filtergauss_filterGaussFilterGaussFilterGaussFiltergauss_filter, smooth_imagesmooth_imageSmoothImageSmoothImageSmoothImagesmooth_image, median_imagemedian_imageMedianImageMedianImageMedianImagemedian_image, anisotropic_diffusionanisotropic_diffusionAnisotropicDiffusionAnisotropicDiffusionAnisotropicDiffusionanisotropic_diffusion

可能的后置算子

select_shapeselect_shapeSelectShapeSelectShapeSelectShapeselect_shape, reduce_domainreduce_domainReduceDomainReduceDomainReduceDomainreduce_domain, select_grayselect_graySelectGraySelectGraySelectGrayselect_gray

可替代算子

regiongrowing_nregiongrowing_nRegiongrowingNRegiongrowingNRegiongrowingNregiongrowing_n, regiongrowing_meanregiongrowing_meanRegiongrowingMeanRegiongrowingMeanRegiongrowingMeanregiongrowing_mean, label_to_regionlabel_to_regionLabelToRegionLabelToRegionLabelToRegionlabel_to_region

模块

Foundation