spline for corner object
6 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Mehri Mehrnia
am 24 Jul. 2022
Kommentiert: Jeffrey Clark
am 27 Jul. 2022
I have a contour that I have extracted important points of it based on detectHarrisFeatures. Now I need to connect these points with spline using cscvn function to get the primary contour. But, points fed into cscvn function need to be in a order but the the output points of detectHarrisFeatures are not in order. sort function does not work as its the closed contour and the numbers are not in ascending/descending order. I've attached main image that I've extracted the contour and corner points.
0 Kommentare
Akzeptierte Antwort
Jeffrey Clark
am 24 Jul. 2022
@Mehri Mehrnia, use Transform Cartesian coordinates to polar or cylindrical - MATLAB cart2pol (mathworks.com) and sort by theta to get the sort index return [~,I] = sort(theta), then use I to index your cartesian data in a proper order.
1 Kommentar
Jeffrey Clark
am 27 Jul. 2022
@Mehri Mehrnia, thanks for accepting. @David Goodmanson's answer shows that an appropriate selection for the cartesian central point is needed for either of these to work; for your case probably just the mean x and y. But depending on the image irregularities, outline points selection, fidelity etc it may be difficult to find one central point where its rays don't intesect a concave extent (from the chosen point's perspective).
Weitere Antworten (1)
David Goodmanson
am 24 Jul. 2022
HI Mehri,
try sorting by angle around a point in the center:
x0 = 350;
y0 = 325;
theta = atan2(y-y0,x-x0);
[~,ind] = sort(theta);
xnew = x(ind);
ynew = y(ind);
0 Kommentare
Siehe auch
Kategorien
Mehr zu Spline Construction finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!