視訊幀内異或,針對視訊幀内的某些幀,在其幀内進行異或,
使用混沌圖像,跟幀的高位(第8位)進行異或。
異或過程:
%特定幀的幀内異或
%2013-9-19
clc;
clear all;
aviobj=avifile('aviVideo\myAVIXor');
aviobj.Quality=100;
aviobj.compression='None';
mov=mmreader('aviVideo\vipfly.avi'); %用mmreader讀入視訊檔案 50幀
mySize=read(mov,1);
[m n]=size(mySize);
nShort=n/3; %彩色圖像的其中一幀
%産生混沌序列
%産生第1個混沌序列
l=linspace(0,0,m*nShort);
l(1)=0.98;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs1=reshape(l,m,nShort);%chaotic system1
%産生第2個混沌序列
l(1)=0.99;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs2=reshape(l,m,nShort);%chaotic system2
%産生第3個混沌序列
l(1)=0.92;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs3=reshape(l,m,nShort); %chaotic system3
% b1=ones(m,n,3);
% b3=b1;
begin=5; %開始置亂的幀數
myEnd=10; %結束置亂的幀數
for i=1:begin-1
b=read(mov,i);
aviobj=addframe(aviobj,b);
end
%%%%%%%%%%%%%%%異或
for i=begin:myEnd %将特定幀内異或
b=read(mov,i);
cs(:,:,1)=cs1;
cs(:,:,2)=cs2;
cs(:,:,3)=cs3;
% result=xor(b,cs);
t=bitget(b,8);
temp1=xor(cs,t);
result=bitset(b,8,temp1);
% result=ones(240,320,3);
aviobj=addframe(aviobj,result);
end
%%%%%%%%%%%%%%%置亂
for i=myEnd+1:mov.numberofframes
b=read(mov,i);
aviobj=addframe(aviobj,b);
end
aviobj=close(aviobj);
mplay('aviVideo\myAVIXor.avi');
逆異或過程,與異或過程一緻,僅僅選取的初始檔案有差異而已:
%特定幀的幀内逆異或
%2013-9-19
clc;
clear all;
aviobj=avifile('myAVI\myAVIXor');
aviobj.Quality=100;
aviobj.compression='None';
mov=mmreader('aviVideo\myAVIXor.avi'); %用mmreader讀入視訊檔案 50幀
mySize=read(mov,1);
[m n]=size(mySize);
nShort=n/3; %彩色圖像的其中一幀
%産生混沌序列
%産生第1個混沌序列
l=linspace(0,0,m*nShort);
l(1)=0.98;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs1=reshape(l,m,nShort);%chaotic system1
%産生第2個混沌序列
l(1)=0.99;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs2=reshape(l,m,nShort);%chaotic system2
%産生第3個混沌序列
l(1)=0.92;
for i=2:m*nShort
l(i)=1-2*l(i-1)*l(i-1);
end
%轉為二進制隻包含0和1
for i=1:m*nShort
if l(i)>0
l(i)=1;
else
l(i)=0;
end
end
cs3=reshape(l,m,nShort); %chaotic system3
% b1=ones(m,n,3);
% b3=b1;
begin=5; %開始置亂的幀數
myEnd=10; %結束置亂的幀數
for i=1:begin-1
b=read(mov,i);
aviobj=addframe(aviobj,b);
end
%%%%%%%%%%%%%%%異或
for i=begin:myEnd %将特定幀内異或
b=read(mov,i);
cs(:,:,1)=cs1;
cs(:,:,2)=cs2;
cs(:,:,3)=cs3;
% result=xor(b,cs);
t=bitget(b,8);
temp1=xor(cs,t);
result=bitset(b,8,temp1);
% result=ones(240,320,3);
aviobj=addframe(aviobj,result);
end
%%%%%%%%%%%%%%%置亂
for i=myEnd+1:mov.numberofframes
b=read(mov,i);
aviobj=addframe(aviobj,b);
end
aviobj=close(aviobj);
mplay('myAVI\myAVIXor.avi');