[mmwatershed] [Up] [mmlabel] Measurements

mmhistogram
Find the histogram of the image f.

Synopsis

h = mmhistogram ( f , option = "uint16" )

Input

f Image Gray-scale (uint8 or uint16) or binary image

option String

Values: "uint16" or "int32".

Default: "uint16" ('uint16')

Output

h Image Gray-scale (uint8 or uint16) image

Histogram in a uint16 or an int32 vector.

Description

Finds the histogram of the image f and returns the result in the vector h. For binary image the vector size is 2, for gray-scale uint8 and uint16 images, the vector size is the maximum pixel value plus one. h[0] gives the number of pixels with value 0.

Examples

f=uint8([0, 1, 1, 2, 2, 2, 5, 3, 5])
h=mmhistogram(f)
print h
[1 2 3 1 0 2]
f=mmreadgray('lenina.tif')
mmshow(f)
h=mmhistogram(f)
mmplot([[[], h, '', 'impulses']])
f [[[], h, '', 'impulses']]

Equation

See also

mmstats Find global image statistics.
mmblob Blob measurements from a labeled image.
mmgrain Gray-scale statistics for each labeled region.
mmfreedom Control automatic data type conversion.
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