min1__ ( Image : ImageMin : MaskHeight, MaskWidth : )

Determine the minimum gray value within a rectangle.

min1__ calculates the minimum 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 ImageMin. 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 minimum gray values are to be calculated.

ImageMin (output_object)
image(-array) -> object : byte / direction / int4 / real
Image containing the minimum 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 (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

min1__ 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

max1__



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