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mask2poly

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mask2poly

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07 Jul 2011 (Updated )

Finds a polygon enclosing the user defined mask. Inverse of poly2mask :).

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Description

This functions goal is to find a polygon which enclosures a user supplied mask. It's a kind of a complementary of Matlab poly2mask function. The difference is that all contour points are returned- without missing points for linearly related points. In order to get a 100% complementary of poly2mask all points inside straight lines should be omitted. In my case I actually need all those points, as index of ROI.
Combining mask2poly with poly2mask the user can produce a mask from a contour (line with X and Y coordinates), and vise-versa.

MATLAB release MATLAB 7.12 (R2011a)
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Comments and Ratings (5)
02 Aug 2014 ted p teng  
10 May 2013 Nikolay S.

Hi Daniel.
Thanks for the comment. Unfortunately, it seems to be precise. Too bad I did not knew about the bwboundaries function, before writing my own. bwboundaries seems to works nicely. Out of curiosity can you send me an example of an image where my function fails (I've used it extensively in object tracking without problems)?
Thanks!

09 May 2013 Daniel Golden

This is a great idea for a function, but it unfortunately fails in some cases. Matlab has a more robust method built in: bwboundaries.

10 Feb 2012 Lili  
13 Jul 2011 Daniel

Thanks for that contribution. The function works fine, is minimalistic and fast! Applied with a region growing algorithm to come to a final polygon.

Updates
13 Jul 2011

- "Inner" and "Outer" options replaced isIndex option
- Diff based edges calculation replaced contour based calculation for "Inner" and "Outer" options, which resulted in ~x3 shorter run time.

14 Jul 2011

An option to reorder the points so it will define a CW contour. Now you can plot the contours with line connecting the dots, without getting crazy lines all over the mask. Enable the "flagCW".

17 Jul 2011

Minor changes, according to Daniel's remarks.

25 Jul 2011

---------------2011-07-25----------- Ordering points according to rule of "nearest point" (accurate but slow) added.

25 Jul 2011

Minor change

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