mmgrain - Gray-scale statistics for each labeled region.

Synopsis: y = mmgrain( fr, f, measurement, option )

Input: fr: Gray-scale (uint8 or uint16) image. Labeled image, to define the regions. Label 0 is the background region.; f: Gray-scale (uint8 or uint16) image. To extract the measuremens.; measurement: String. Choose the measure to compute: 'max', 'min', 'mean', 'sum', 'std', 'std1'.; option: String. Output format: 'image': results as a gray-scale mosaic image (uint16); 'data': results a column vector of measurements (double). Default: "image".

Output: y: Gray-scale (uint8 or uint16) image. Or a column vector (double) with gray-scale statistics per region.

Description: Computes gray-scale statistics of each grain in the image. The grains regions are specified by the labeled image fr and the gray-scale information is specified by the image f. The statistics to compute is specified by the parameter measurement, which has the same options as in function mmstats. The parameter option defines: ('image') if the output is an uint16 image where each label value is changed to the measurement value, or ('data') a double column vector. In this case, the first element (index 1) is the measurement of region 1. The region with label zero is not measure as it is normally the background.

Examples

Numerical Example

f=uint8([0:5;0:5;0:5])

f =
     0     1     2     3     4     5
     0     1     2     3     4     5
     0     1     2     3     4     5
fr=mmlabelflat(f)

fr =
     1     2     3     4     5     6
     1     2     3     4     5     6
     1     2     3     4     5     6
mmgrain(fr,f,'sum','data')

ans =
     0
     3
     6
     9
    12
    15
mmgrain(fr,f,'sum')

ans =
     0     3     6     9    12    15
     0     3     6     9    12    15
     0     3     6     9    12    15

Watershed Mosaic

The catchment basins of the watershed of the gradient from markers have all its pixels with the mean gray level within its catchment basin.

f=imread('astablet.tif');
g=mmgradm(f);
marker=mmregmin(mmclose(g));
ws=mmcwatershed(g,marker,mmsebox,'regions');
g=mmgrain(ws,f,'mean');
mmshow(f);
mmshow(g);

(f)

(g)

See Also: mmblob - Blob measurements from a labeled image.; mmlabel - Label a binary image.; mmlabelflat - Label the flat zones of gray-scale images.; mmstats - Find global image statistics.

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