c1 = 0.8;
c2 =0.2;
anglebetweencomponents = 30;
speedratio = 1.5;

[imarray,movieframes] = MakePlaidMovie(c1,c2,anglebetweencomponents,speedratio);
% to show the movie, you can use:
movieview(movieframes);
% if you want it to repeat twice, you can do
movieview([movieframes movieframes])
% or play backwards
movieview(movieframes(end:-1:1))

% now compute the image derivatives
[Ix,Iy,It]=ComputeImageDerivs(imarray);

% to compute the velocity likelihood, first selection a spacetime region
pixellocation_ijt =[32 32 16]; % y=32, x=32, t=16
% and choose the size of the averaging window
window_sigma = 8; 

%  velocity range to compute the likelihood over
vellims = [-3 3];
%  if you want this chosen automatically, leave this blank.

% finally, decide how noisy our measurements are
Measure_sigma=1;

% compute the likelihood of vx,vy for a range of vx and vy
[p_Igivenv,Vx,Vy] = ComputeVelLikeli(Ix,Iy,It,Measure_sigma,pixellocation_ijt,window_sigma,vellims);
%
%compute the prior on vx, vy
%  choose Prior_sigma
Prior_sigma = 1;
P_v = ComputePrior(Vx,Vy,Prior_sigma);

Posterior_v = (p_Igivenv.*P_v)/sum(sum(p_Igivenv.*P_v));
% finally you can visualize the effects of the components and the
% probabilities
% for example, to view the area in the original movie and the likelihood
% for that region, call
ShowPdistandMovieFrames(imarray,pixellocation_ijt,window_sigma,p_Igivenv,Vx,Vy);
% for example, to view the area in the temporal derivative and the
% posterior
% for that region, call
ShowPdistandMovieFrames(It,pixellocation_ijt,window_sigma,Posterior_v,Vx,Vy);