range__ ( Image : ImageResult : MaskHeight, MaskWidth : )
Determine the gray value range within a rectangle.
range__ calculates the gray value range, i.e., the
difference (max - min) of the maximum and
minimum gray values, of the input image Image within a
rectangular mask of size (MaskHeight,
MaskWidth) for each image point. The resulting image is
returned in ImageResult. If the parameters
MaskHeight or MaskWidth are even, they are
changed to the next larger odd value. At the border of the image
the gray values are mirrored.
Parameters
Image (input_object)
|
image(-array) -> object : byte / direction / int4 / real
|
Image for which the gray value range is to
be calculated. |
ImageResult (output_object)
|
image(-array) -> object : byte / direction / int4 / real
|
Image containing the gray value range. |
MaskHeight (input_control)
|
extent.y -> integer
|
Height of the filter mask. |
Default value: 11 |
Suggested values: 3, 5, 7, 9, 11, 13, 15 |
Range of values: 3 <= MaskHeight <= 511 (lin) |
Minimum increment: 2
|
Recommended increment: 2
|
Restriction: odd(MaskHeight) |
MaskWidth (input_control)
|
extent.x -> integer
|
Width of the filter mask. |
Default value: 11 |
Suggested values: 3, 5, 7, 9, 11, 13, 15 |
Range of values: 3 <= MaskWidth <= 511 (lin) |
Minimum increment: 2
|
Recommended increment: 2
|
Restriction: odd(MaskWidth) |
Result
range__ returns TRUE if all parameters are correct.
If the input is empty the behaviour can be set via
set_system(::'no_object_result',<Result>:).
If necessary, an exception is raised.
Alternatives
max1__,
min1__,
sub__
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