max1__ ( Image : ImageMax : MaskHeight, MaskWidth : )

Determine the maximum gray value within a rectangle.

max1__ calculates the maximum gray value of the input image Image within a rectangular mask of size (MaskHeight, MaskWidth) for each image point. The resulting image is returned in ImageMax. 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 maximum gray values are to be calculated.

ImageMax (output_object)
image(-array) -> object : byte / direction / int4 / real
Image containing the maximum gray values.

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
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
Minimum increment: 2
Recommended increment: 2
Restriction: odd(MaskWidth)


Result

max1__ 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.


See also

grey_skeleton__



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