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mmneg
Negate an image.

Synopsis

y = mmneg( f )

Implemented in Python.

f	Image Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image.

y	Image Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image.

mmneg returns an image y that is the negation (i.e., inverse or involution) of the image f. In the binary case, y is the complement of f.

>>> f=uint8([255, 255, 0, 10, 20, 10, 0, 255, 255])

>>> print mmneg(f)

[  0   0 255 245 235 245 255   0   0]

>>> print mmneg(uint8([0, 1]))

[255 254]

>>> print mmneg(int32([0, 1]))

[ 0 -1]

Binary image:

>>> a = mmreadgray('gear.tif')

>>> b = mmneg(a)

>>> mmshow(a)

>>> mmshow(b)


a	b

Gray-scale image:

>>> c = mmreadgray('astablet.tif')

>>> d = mmneg(c)

>>> mmshow(c)

>>> mmshow(d)


c	d

Source Code
        def mmneg(f):
    y = mmlimits(f)[0] + mmlimits(f)[1] - f
    y = y.astype(f.typecode())
    return y
    
      

mmfreedom	Control automatic data type conversion.
mmsubm	Subtraction of two images, with saturation.
mmlimits	Get the possible minimum and maximum of an image.

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Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center.