HSoptflow.m
1 function [us,vs] = HSoptflow(Xrgb,n)
2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
3 % Author: Gregory Power gregory.power@wpafb.af.mil
4 % This MATLAB code shows a Motion Estimation map created by
5 % using a Horn and Schunck motion estimation technique on two
6 % consecutive frames. Input requires.
7 % Xrgb(h,w,d,N) where X is a frame sequence of a certain
8 % height(h), width (w), depth (d=3 for color),
9 % and number of frames (N).
10 % n= is the starting frame number which is less than N
11 % V= the output variable which is a 2D velocity array
12 %
13 % Sample Call: V=HSoptflow(X,3);
14 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
15 [h,w,d,N]=size(Xrgb);
16 if n>N-1
17 error(1,'requested file greater than frame number required');
18 end;
19 %get two image frames
20 if d==1
21 Xn=double(Xrgb(:,:,1,n));
22 Xnp1=double(Xrgb(:,:,1,n+1));
23 elseif d==3
24 Xn=double(Xrgb(:,:,1,n)*0.299+Xrgb(:,:,2,n)*0.587+Xrgb(:,:,3,n)*0.114);
25 Xnp1=double(Xrgb(:,:,1,n+1)*0.299+Xrgb(:,:,2,n+1)*0.587+Xrgb(:,:,3,n+1)*0.114);
26 else
27 error(2,'not an RGB or Monochrome image file');
28 end;
29
30 %get image size and adjust for border
31 size(Xn);
32 hm5=h-5; wm5=w-5;
33 z=zeros(h,w); v1=z; v2=z;
34
35 %initialize
36 dsx2=v1; dsx1=v1; dst=v1;
37 alpha2=625;
38 imax=20;
39
40 %Calculate gradients
41 dst(5:hm5,5:wm5) = ( Xnp1(6:hm5+1,6:wm5+1)-Xn(6:hm5+1,6:wm5+1) + Xnp1(6:hm5+1,5:wm5)-Xn(6:hm5+1,5:wm5)+ Xnp1(5:hm5,6:wm5+1)-Xn(5:hm5,6:wm5+1) +Xnp1(5:hm5,5:wm5)-Xn(5:hm5,5:wm5))/4;
42 dsx2(5:hm5,5:wm5) = ( Xnp1(6:hm5+1,6:wm5+1)-Xnp1(5:hm5,6:wm5+1) + Xnp1(6:hm5+1,5:wm5)-Xnp1(5:hm5,5:wm5)+ Xn(6:hm5+1,6:wm5+1)-Xn(5:hm5,6:wm5+1) +Xn(6:hm5+1,5:wm5)-Xn(5:hm5,5:wm5))/4;
43 dsx1(5:hm5,5:wm5) = ( Xnp1(6:hm5+1,6:wm5+1)-Xnp1(6:hm5+1,5:wm5) + Xnp1(5:hm5,6:wm5+1)-Xnp1(5:hm5,5:wm5)+ Xn(6:hm5+1,6:wm5+1)-Xn(6:hm5+1,5:wm5) +Xn(5:hm5,6:wm5+1)-Xn(5:hm5,5:wm5))/4;
44
45 for i=1:imax
46 delta=(dsx1.*v1+dsx2.*v2+dst)./(alpha2+dsx1.^2+dsx2.^2);
47 v1=v1-dsx1.*delta;
48 v2=v2-dsx2.*delta;
49 end;
50 u=z; u(5:hm5,5:wm5)=v1(5:hm5,5:wm5);
51 v=z; v(5:hm5,5:wm5)=v2(5:hm5,5:wm5);
52
53 xskip=round(h/64);
54 [hs,ws]=size(u(1:xskip:h,1:xskip:w))
55 us=zeros(hs,ws); vs=us;
56
57 N=xskip^2;
58 for i=1:hs-1
59 for j=1:ws-1
60 hk=i*xskip-xskip+1;
61 hl=i*xskip;
62 wk=j*xskip-xskip+1;
63 wl=j*xskip;
64 us(i,j)=sum(sum(u(hk:hl,wk:wl)))/N;
65 vs(i,j)=sum(sum(v(hk:hl,wk:wl)))/N;
66 end;
67 end;
68
69 figure(1);
70 quiver(us,vs);
71 colormap('default');
72 axis ij;
73 axis tight;
74 axis equal;
main.m
1 close all;
2 clear all;
3 clc;
4 n=40;
5
6 raw=zeros(200,256,1,n);
7 for i=1:n
8 filename=strcat('E:matlab_worklianxidata11 (',int2str(i),').bmp');
9 raw(:,:,1,i)=imread(filename);
10 end
11
12 for i=1:n-1
13 V=HSoptflow(raw,i);
14 end
老外写的函数，拿来研究研究。