mmunion

mmunion
Union of images.

Synopsis

y = mmunion( f1, f2, f3 = None, f4 = None, f5 = None )

Implemented in Python.

Input

f1	Image Gray-scale (uint8 or uint16) or binary image.
f2	Image Gray-scale (uint8 or uint16) or binary image. Or constant
f3	Image Gray-scale (uint8 or uint16) or binary image. Or constant. Default: `None`
f4	Image Gray-scale (uint8 or uint16) or binary image. Or constant. Default: `None`
f5	Image Gray-scale (uint8 or uint16) or binary image. Or constant. Default: `None`

Output

Image

Description

mmunion creates the image y by taking the pixelwise maximum between the images f1, f2, f3, f4, and f5. When f1, f2, f3, f4, and f5 are binary images, y represents the union of them.

Examples

Numerical example:

>>> f=uint8([255, 255,  0,  10,   0, 255, 250])

>>> print 'f=',f

f= [255 255   0  10   0 255 250]

>>> g=uint8([  0,  40, 80, 140, 250,  10,  30])

>>> print 'g=',g

g= [  0  40  80 140 250  10  30]

>>> print mmunion(f, g)

[255 255  80 140 250 255 250]

>>> print mmunion(f, 255)

Warning: Converting input image from int32 to uint8.
[255 255 255 255 255 255 255]

Binary image

>>> a = mmreadgray('form-ok.tif')

>>> b = mmreadgray('form-1.tif')

>>> c = mmunion(a,b)

>>> mmshow(a)

>>> mmshow(b)

>>> mmshow(c)


a	b


c

Binary with gray-scale image:

>>> d = mmreadgray('danaus.tif')

>>> e = mmcmp(d,'<',80)

>>> f = mmunion(d,mmgray(e))

>>> mmshow(d)

>>> mmshow(e)

>>> mmshow(f)


d	e


f

Gray scale image:

>>> g = mmreadgray('tplayer1.tif')

>>> h = mmreadgray('tplayer2.tif')

>>> i = mmreadgray('tplayer3.tif')

>>> j = mmunion(g,h,i)

>>> mmshow(g)

>>> mmshow(h)

>>> mmshow(i)

>>> mmshow(j)


g	h	i


j

Equation

union:

generalized union:

Source Code

def mmunion(f1, f2, f3=None, f4=None, f5=None):
    from Numeric import maximum
    y = maximum(f1,f2)
    if f3: y = maximum(y,f3)
    if f4: y = maximum(y,f4)
    if f5: y = maximum(y,f5)
    y = y.astype(f1.typecode())
    return y

mmfreedom	Control automatic data type conversion.
mmintersec	Intersection of images.

[`mmsymdif`] [Up] [`mmimg2se`]
Copyright (c) 2003, Roberto A. Lotufo, UNICAMP-University of Campinas; Rubens C. Machado, CenPRA-Renato Archer Research Center.

mmunion Union of images.