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Re: Curve Fitting and Plotting
From: |
Carlo de Falco |
Subject: |
Re: Curve Fitting and Plotting |
Date: |
Mon, 29 Sep 2008 12:39:42 +0100 |
On 29/set/08, at 09:46, Kearan Mc Pherson wrote:
HI
i am capturing two video streams of a moving cricket ball. one view
from the side and the other from above. after image processing i
obtain the two data.dat files. from here i want to do curve fitting
in order to achieve the data points/coordinates of the moving ball
in 3D. after this i want to plot the graph in 3D
Citing from wikipedia [1]
"In computer graphics, Catmull–Rom splines are frequently used to get
smooth interpolated motion between key frames. For example, most
camera path animations generated from discrete key-frames are handled
using Catmull–Rom splines. They are popular mainly for being
relatively easy to compute, guaranteeing that each key frame position
will be hit exactly, and also guaranteeing that the tangents of the
generated curve are continuous over multiple segments."
There is a catmullrom function in the "splines" pcakage on octave-forge:
>> pkg load splines
>> help catmullrom
-- Function File: PP = catmullrom( X, F, V)
Returns the piecewise polynomial form of the Catmull-Rom cubic
spline interpolating F at the points X. If the input V is
supplied it will be interpreted as the values of the tangents at
the extremals, if it is missing, the values will be computed from
the data via one-sided finite difference formulas. See the
wikipedia page for "Cubic Hermite spline" for a description of the
algorithm.
See also: ppval.
HTH,
c.
[1] http://en.wikipedia.org/wiki/Catmull-Rom_spline#Catmull.E2.80.93Rom_spline
- Re: Curve Fitting and Plotting, (continued)
- Re: Curve Fitting and Plotting, David Bateman, 2008/09/26
- Re: Curve Fitting and Plotting, Stefano Mandelli, 2008/09/26
- Re: Curve Fitting and Plotting, Ben Abbott, 2008/09/26
- Re: Curve Fitting and Plotting, Fredrik Lingvall, 2008/09/26
- Re: Curve Fitting and Plotting, Kearan Mc Pherson, 2008/09/29
- Re: Curve Fitting and Plotting, Jaroslav Hajek, 2008/09/29
- Re: Curve Fitting and Plotting, Kearan Mc Pherson, 2008/09/29
- Re: Curve Fitting and Plotting, Jaroslav Hajek, 2008/09/29
- Re: Curve Fitting and Plotting, Kearan Mc Pherson, 2008/09/29
- Re: Curve Fitting and Plotting, Jaroslav Hajek, 2008/09/29
- Re: Curve Fitting and Plotting,
Carlo de Falco <=
Re: Curve Fitting and Plotting, Michael Creel, 2008/09/26