Steve on Image Processing

June 13th, 2007

Connected component labeling - Wrapping up

I've about run out of things to say for now about connected component labeling algorithms. ("Hurray!" shouts the audience.)

For reference, here's a summary of all the posts in the series:

By Steve Eddins

16:00 UTC | Posted in Connected components | Permalink |

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2 Responses to “Connected component labeling - Wrapping up”

  1. Ram replied on February 16th, 2008 at 00:46 UTC :

    hi steve,

    Is there a way of establishing custom connectivity
    such as conn=[00100;
    01110;
    11111;
    01110;
    00100];?
    If i am not wrong bwlabel allows only scalars 4 and 8.

  2. Steve replied on February 16th, 2008 at 08:14 UTC :

    Ram—Use bwlabeln, which allows custom connectivity matrix. However, your example is not a valid connectivity matrix. The Image Processing Toolbox connectivity definitions do not allow you to say that a pixel is directly adjacent to another pixel that’s two steps away, which is what your matrix implies.

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Steve Eddins manages the Image & Geospatial development team at The MathWorks and coauthored Digital Image Processing Using MATLAB. He writes here about image processing concepts, algorithm implementations, and MATLAB.

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