mmblob - Blob measurements from a labeled image.

Synopsis: y = mmblob( fr, measurement, option )

Input: fr: Gray-scale (uint8 or uint16) image. Labeled image.; measurement: String. Choice from 'AREA', 'CENTROID', or 'BOUNDINGBOX'.; option: String. Output format: 'image': results as a binary image (logical uint8); 'data': results a column vector of measurements (double). Default: "image".

Output: y: Gray-scale (uint8 or uint16) or binary image (logical uint8).

Description: Take measurements from the labeled image fr. The measurements are: area, centroid, or bounding rectangle. The parameter option controls the output format: 'IMAGE': the result is an image; 'DATA': the result is a double column vector with the measurement for each blob. The region with label zero is not measured as it is normally the background. The measurement of region with label 1 appears at the first row of the output.

Examples

fr=uint8([1 1 1 0 0 0; 1 1 1 0 0 2; 1 1 1 0 2 2])

fr =
     1     1     1     0     0     0
     1     1     1     0     0     2
     1     1     1     0     2     2
f_area=mmblob(fr,'area')

f_area =
     9     9     9     0     0     0
     9     9     9     0     0     3
     9     9     9     0     3     3
f_cent=mmblob(fr,'centroid')

f_cent =
     0     0     0     0     0     0
     0     1     0     0     1     0
     0     0     0     0     0     0
f_bb=mmblob(fr,'boundingbox')

f_bb =
     1     1     1     0     0     0
     1     0     1     0     1     1
     1     1     1     0     1     1
d_area=mmblob(fr,'area','data')

d_area =
     9
     3
d_cent=mmblob(fr,'centroid','data')

d_cent =
     2     2
     2     5
d_bb=mmblob(fr,'boundingbox','data')

d_bb =
     1     1     3     3
     2     5     3     6

Area Transform

f=mmreadgray('blob3.tif');
fr=mmlabel(f);
g=mmblob(fr,'area');
mmshow(f);
mmshow(g);

(f)

(g)

Centroids

f=mmreadgray('blob3.tif');
fr=mmlabel(f);
centr=mmblob(fr,'centroid');
mmshow(f,mmdil(centr));

(f,mmdil(centr))

Bounding Box

f=mmreadgray('blob3.tif');
fr=mmlabel(f);
box=mmblob(fr,'boundingbox');
mmshow(f,box);

(f,box)

See Also: mmdrawv - Superpose points, rectangles and lines on an image. (replaces mmdraw); mmgrain - Gray-scale statistics for each labeled region.; mmlabel - Label a binary image.; mmlabelflat - Label the flat zones of gray-scale images.; mmstats - Find global image statistics.

[Top] [Up] [Prev] [Next]	[Up] [Basic Concepts] [Demonstrations] [Functions]
Copyright (c) 1998-2002 by SDC Information Systems