intensity — Calculate the mean and deviation of gray values.
The operator intensity calculates the mean and the
deviation of the gray values in the input image within
Regions. 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:
Note that the operator intensity only considers
the given Regions and ignores any previously set domain
of the input image Image.
The calculation of Deviation does not follow the usual
definition if the region of the image contains only one pixel. In
this case 0.0 is returned.
Regions (input_object) region(-array) → object
Regions in which the features are calculated.
Image (input_object) singlechannelimage → object (byte / direction / cyclic / int1 / int2 / uint2 / int4 / real)
Gray value image.
Mean (output_control) real(-array) → (real)
Mean gray value of a region.
Deviation (output_control) real(-array) → (real)
Deviation of gray values within a region.
If F is the area of the region, the runtime complexity is O(F).
The operator intensity 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>:),
the behavior in case of empty region is set via
set_system(::'empty_region_result',<Result>:).
If necessary an exception is raised.
mean_image,
gray_histo,
gray_histo_abs
Foundation