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acmuser

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
10Â¥: Originally posted by chujian77 at 2012-05-15 22:41:15:
ÎҵĿ´·¨ÊÇ£º
1.¸ø³ö°üº¬TÐÍÇøÓòµÄÈý¸öÐéÄâµã£¨×ø±ê¹»´ó¼´¿É£©£¬¼ÓÈëµ½TÐÍÇøÓòµã¼¯ÖУ¬½øÐÐÆÊ·Ö¡£
2.ÕÒ³öTÐͱ߽çÓëÄãµÄÆÊ·ÖÍøµÄ½»µã£¬×÷Ϊеã¼ÓÈëµ½Ô­À´µÄµã¼¯£¬ÖØÐÂÔÙ×öÒ»´ÎDelaunayÆÊ·Ö£¬»ù±¾ÉÏ¿ÉÒÔ±£Ö¤TÐÍÇø ...

that may not work, run this matlab script, n is the number of points in the cloud, and R parametrize the virtual points,
function delaunayclouds(n,R)

x=rand(n,1);
y=rand(n,1);

ir = find(x>0.5 & y>0.5);

il = setdiff(1:n,ir);

x=x(il);
y=y(il);

N=length(il);
x(N+1:N+3) = [R, R, -R]';
y(N+1:N+3) = [-R, R, R]';

figure(1);
plot(x,y,'x')
dt = DelaunayTri(x,y);

figure(2);
triplot(dt);


11Â¥2012-05-15 23:05:09
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

acmuser

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
11Â¥: Originally posted by acmuser at 2012-05-15 23:05:09:
that may not work, run this matlab script, n is the number of points in the cloud, and R parametrize the virtual points,
function delaunayclouds(n,R)

x=rand(n,1);
y=rand(n,1);

ir = find(x ...

I can even add more virtual points, but still no help, in the following, I add 8 virtual points


12Â¥2012-05-15 23:14:49
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

acmuser

Òø³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

ÒýÓûØÌû:
12Â¥: Originally posted by acmuser at 2012-05-15 23:14:49:
I can even add more virtual points, but still no help, in the following, I add 8 virtual points
16/f5/1582407_1337094886_789.jpg

I think there are some boundary estimate or support estimate algorithm for data clouds in computer graphics, that might help to properly solve this problem. For example,
Rolling-Ball Method For Estimating The Boundary Of The Support Of A Point-Process Intensity (1998)
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.44.3512

But I won't have time to read it through, if you find something simpler, please let us know.
13Â¥2012-05-15 23:22:15
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

acmuser

Òø³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
13Â¥: Originally posted by acmuser at 2012-05-15 23:22:15:
I think there are some boundary estimate or support estimate algorithm for data clouds in computer graphics, that might help to properly solve this problem. For example,
Rolling-Ball Method For E ...

A faster fix might be add some points in the concave corner, see attached, but it is artificial indeed


14Â¥2012-05-15 23:38:17
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

acmuser

Òø³æ (СÓÐÃûÆø)

¡¾´ð°¸¡¿Ó¦Öú»ØÌû

use 5 points in the corner


15Â¥2012-05-16 00:25:02
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