www.gusucode.com > 粒子滤波全套源代码，实现了粒子滤波的全部功能，是粒子滤波提高级程序 > particle filter program/weight.m

    function w=weight(p,q,sita)
% given the standard deviaton sita, and the Bhattacharyya distacne d of two
% color hisgrams(one of them is the target's, the other is the sample's),
% the function return the sample's coresponding weight.
% This weighting data is the base for the tracking algorithem
m=512;
simi=0;
for i=1:1:m;
 simi=simi+(p(i)*q(i))^0.5;
end
d=(1-simi)^0.5;

w=(1/(sita*(2*pi)^0.5))*exp(-(d^2)/(2*sita^2));
%w=simi;   %更有利于理想实验，不同背景的为零

return