intensityintensityintensityIntensityIntensity (Operator)

Name

intensityintensityintensityIntensityIntensity — Calculate the mean and deviation of gray values.

Signature

Description

The operator intensityintensityintensityIntensityIntensity calculates the mean and the deviation of the gray values in the input image within RegionsRegionsRegionsRegionsregions. If R is a region, p a pixel from R with the gray value g(p) and F the plane (F = |R|), the features are defined by:

                ----
                \
   Mean      =  /     g(p)
                ----
               p in R
               -----------
                    F

                 -----------------------
                 |    ----
                 | 1  \                2
   Deviation =   | -  /     (g(p)-Mean)
               \ | F  ----
                \|   p in R

Attention

The calculation of DeviationDeviationDeviationDeviationdeviation does not follow the usual definition if the region of the image contains only one pixel. In this case 0.0 is returned.

Parallelization

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

Parameters

Complexity

If F is the area of the region, the runtime complexity is O(F).

Result

The operator intensityintensityintensityIntensityIntensity returns the value 2 (H_MSG_TRUE). The behavior in case of empty input (no input images available) is set via the operator set_system(::'no_object_result',<Result>:)set_system("no_object_result",<Result>)set_system("no_object_result",<Result>)SetSystem("no_object_result",<Result>)SetSystem("no_object_result",<Result>), the behavior in case of empty region is set via set_system(::'empty_region_result',<Result>:)set_system("empty_region_result",<Result>)set_system("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>)SetSystem("empty_region_result",<Result>). If necessary an exception is raised.

Possible Successors

thresholdthresholdthresholdThresholdThreshold

Alternatives

select_grayselect_grayselect_graySelectGraySelectGray, min_max_graymin_max_graymin_max_grayMinMaxGrayMinMaxGray

See also

mean_imagemean_imagemean_imageMeanImageMeanImage, mean_imagemean_imagemean_imageMeanImageMeanImage, gray_histogray_histogray_histoGrayHistoGrayHisto, gray_histo_absgray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbs

Module

Foundation