[mmsymdif] [Up] [mmimg2se] Operations

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

y 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
    

See also

mmfreedom Control automatic data type conversion.
mmintersec Intersection of images.
[mmsymdif] [Up] [mmimg2se] Python