gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangegray_histo_range (Operator)

Name

gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangegray_histo_range — Calculate the gray value distribution of a single channel image within a certain gray value range.

Signature

Description

gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range calculates the gray value distribution HistoHistoHistoHistohistohisto of the single channel ImageImageImageImageimageimage within RegionsRegionsRegionsRegionsregionsregions and the gray value range [MinMinMinMinminmin,MaxMaxMaxMaxmaxmax]. The values for MinMinMinMinminmin and MaxMaxMaxMaxmaxmax are rounded down to the next integer if the ImageImageImageImageimageimage is not of type 'real'"real""real""real""real""real". The gray value range is divided into NumBinsNumBinsNumBinsNumBinsnumBinsnum_bins bins of the same size, which is returned in BinSizeBinSizeBinSizeBinSizebinSizebin_size. If a gray value lies between two bins the gray value is assigned to the smaller bin. If the ImageImageImageImageimageimage is of type 'real'"real""real""real""real""real" . If the ImageImageImageImageimageimage has discrete gray values the size of a bin is computed with . Since the accuracy of the histogram HistoHistoHistoHistohistohisto can be adjusted with NumBinsNumBinsNumBinsNumBinsnumBinsnum_bins, the calculation of the gray value histogram with gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range is most useful for images of type 'real'"real""real""real""real""real" and images of type 'integer'"integer""integer""integer""integer""integer", which have a high bit depth.

Attention

Note that the operator gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range only considers the given RegionsRegionsRegionsRegionsregionsregions and ignores any previously set domain of the input image ImageImageImageImageimageimage.

If the ImageImageImageImageimageimage has discrete gray values the value of BinSizeBinSizeBinSizeBinSizebinSizebin_size may cause the following effects: For BinSizeBinSizeBinSizeBinSizebinSizebin_size > 1 multiple neighboring gray values are assigned to the same bin. If BinSizeBinSizeBinSizeBinSizebinSizebin_size is no integer the gray values are distributed uneven among the bins, e.g., for BinSizeBinSizeBinSizeBinSizebinSizebin_size = 1.5 the first and second gray value are assigned to the first bin, the third gray value is assigned to the second bin, and the fourth and fifth gray value are assigned to the third bin. This becomes noticeable in several peeks in the histogram HistoHistoHistoHistohistohisto. If BinSizeBinSizeBinSizeBinSizebinSizebin_size < 1 some classes are not assigned by any gray value, e.g., for BinSizeBinSizeBinSizeBinSizebinSizebin_size = 0.5 the first gray value is assigned to the first bin and the second gray value is assigned to the third bin. The histogram HistoHistoHistoHistohistohisto shows some gaps, which resembles the structure of a comb.

If the ImageImageImageImageimageimage is of type 'real'"real""real""real""real""real" and MinMinMinMinminmin = MaxMaxMaxMaxmaxmax, all pixels of the corresponding gray value are assigned only to the first bin.

Execution Information

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

Parameters

Result

If the parameters are valid, the operator gray_histo_rangegray_histo_rangeGrayHistoRangeGrayHistoRangeGrayHistoRangegray_histo_range returns the value 2 (H_MSG_TRUE). If necessary an exception is raised.

Possible Predecessors

min_max_graymin_max_grayMinMaxGrayMinMaxGrayMinMaxGraymin_max_gray

Possible Successors

create_funct_1d_arraycreate_funct_1d_arrayCreateFunct1dArrayCreateFunct1dArrayCreateFunct1dArraycreate_funct_1d_array

Alternatives

gray_histogray_histoGrayHistoGrayHistoGrayHistogray_histo, gray_histo_absgray_histo_absGrayHistoAbsGrayHistoAbsGrayHistoAbsgray_histo_abs

See also

histo_2dimhisto_2dimHisto2dimHisto2dimHisto2dimhisto_2dim, scale_image_maxscale_image_maxScaleImageMaxScaleImageMaxScaleImageMaxscale_image_max

Module

Foundation