资源简介

LK光流法,是目前来讲监测运动目标中比较高效的算法。这是我试验中的一个代码,分享出来大家学习,用的是matlab语言

资源截图

代码片段和文件信息

function [usvs] = HSoptflow(Xrgbn)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Author: Gregory Power gregory.power@wpafb.af.mil
% This MATLAB code shows a Motion Estimation map created by
% using a Horn and Schunck motion estimation technique on two
% consecutive frames.  Input requires.
%     Xrgb(hwdN) where X is a frame sequence of a certain
%                height(h) width (w) depth (d=3 for color) 
%                and number of frames (N). 
%     n= is the starting frame number which is less than N 
%     V= the output variable which is a 2D velocity array
%
% Sample Call: V=HSoptflow(X3);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
[hwdN]=size(Xrgb);
if n>N-1
   error(1‘requested file greater than frame number required‘);
end
%get two image frames
if d==1
    Xn=double(Xrgb(::1n));
    Xnp1=double(Xrgb(::1n+1));
elseif d==3
    Xn=double(Xrgb(::1n)*0.299+Xrgb(::2n)*0.587+Xrgb(::3n)*0.114);
    Xnp1=double(Xrgb(::1n+1)*0.299+Xrgb(::2n+1)*0.587+Xrgb(::3n+1)*0.114);
else
    error(2‘not an RGB or Monochrome image file‘);
end
 
%get image size and adjust for border
size(Xn);
hm5=h-5; wm5=w-5;
z=zeros(hw); v1=z; %initialize
dsx2=v1; dsx1=v1; dst=v1;
alpha2=625;
imax=20;
 
%Calculate gradients
dst(5:hm55:wm5) = ( Xnp1(6:hm5+16:wm5+1)-Xn(6:hm5+16:wm5+1) + Xnp1(6:hm5+15:wm5)-Xn(6:hm5+15:wm5)+ Xnp1(5:hm56:wm5+1)-Xn(5:hm56:wm5+1) +Xnp1(5:hm55:wm5)-Xn(5:hm55:wm5))/4;
dsx2(5:hm55:wm5) = ( Xnp1(6:hm5+16:wm5+1)-Xnp1(5:hm56:wm5+1) + Xnp1(6:hm5+15:wm5)-Xnp1(5:hm55:wm5)+ Xn(6:hm5+16:wm5+1)-Xn(5:hm56:wm5+1) +Xn(6:hm5+15:wm5)-Xn(5:hm55:wm5))/4;
dsx1(5:hm55:wm5) = ( Xnp1(6:hm5+16:wm5+1)-Xnp1(6:hm5+15:wm5) + Xnp1(5:hm56:wm5+1)-Xnp1(5:hm55:wm5)+ Xn(6:hm5+16:wm5+1)-Xn(6:hm5+15:wm5) +Xn(5:hm56:wm5+1)-Xn(5:hm55:wm5))/4;
 
for i=1:imax
   delta=(dsx1.*v1+dsx2.*v2+dst)./(alpha2+dsx1.^2+dsx2.^2);
   v1=v1-dsx1.*delta;
   v2=v2-dsx2.*delta;
end
u=z; u(5:hm55:wm5)=v1(5:hm55:wm5);
v=z; v(5:hm55:wm5)=v2(5:hm55:wm5);
 
xskip=round(h/64);
[hsws]=size(u(1:xskip:h1:xskip:w));
us=zeros(hsws); vs=us;

N=xskip^2;
for i=1:hs-1
  for j=1:ws-1
     hk=i*xskip-xskip+1;
     hl=i*xskip;
     wk=j*xskip-xskip+1;
     wl=j*xskip;
     us(ij)=sum(sum(u(hk:hlwk:wl)))/N;
     vs(ij)=sum(sum(v(hk:hlwk:wl)))/N;
  end
end
 
figure(1);
quiver(usvs);
colormap(‘default‘);
axis ij;
axis tight;
axis equal;

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件        2486  2018-07-24 20:46  LK实现光流场特征提取\HSoptflow.m
     文件         447  2018-07-24 20:51  LK实现光流场特征提取\main1.m
     文件        1631  2018-07-24 20:56  LK实现光流场特征提取\main3.m
     文件     1095916  2018-07-24 20:47  LK实现光流场特征提取\monkeydog.bmp
     文件        2441  2018-07-24 20:58  LK实现光流场特征提取\suptype.m
     目录           0  2018-07-24 20:56  LK实现光流场特征提取\

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