视频的帧内置乱及逆置乱

原创

superdont 2022-08-15 11:23:37 ©著作权

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置乱

%特定帧的帧内置乱
%2013-9-19
clc;
clear all;
aviobj=avifile('myAVI\myAVI');
aviobj.Quality=100;
aviobj.compression='None';
mov=mmreader('aviVideo\vipfly.avi');     %用mmreader读入视频文件  50帧
mySize=read(mov,1);
[m n]=size(mySize);
nShort=n/3;    %彩色图像的其中一帧
%产生混沌序列
%产生第1个混沌序列
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
[lsort,lindex]=sort(l);
%产生第2个混沌序列
l(1)=0.99;
for i=2:m*nShort
    l(i)=1-2*l(i-1)*l(i-1);
end
[lsort,lindex2]=sort(l);
%产生第3个混沌序列
l(1)=0.92;
for i=2:m*nShort
    l(i)=1-2*l(i-1)*l(i-1);
end
[lsort,lindex3]=sort(l);
% b1=ones(m,n,3);
% b3=b1;
begin=5;  %开始置乱的帧数
myEnd=10;   %结束置乱的帧数
for i=1:begin-1
    b=read(mov,i);
    aviobj=addframe(aviobj,b);
end
%%%%%%%%%%%%%%%置乱
for i=begin:myEnd       %将特定帧置乱
    b=read(mov,i);
    %彩色图像中的R层
    b1=reshape(b(:,:,1),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(lindex(k));
    end
    b3(:,:,1)=reshape(b2,m,nShort);
    %彩色图像中的G层
    b1=reshape(b(:,:,2),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(lindex2(k));
    end
    b3(:,:,2)=reshape(b2,m,nShort);
        %彩色图像中的B层置乱
    b1=reshape(b(:,:,3),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(lindex3(k));
    end
    b3(:,:,3)=reshape(b2,m,nShort);
    %     b2=reshape(b1,m,n);
    aviobj=addframe(aviobj,b3);
end
%%%%%%%%%%%%%%%置乱
for i=myEnd+1:mov.numberofframes
    b=read(mov,i);
    aviobj=addframe(aviobj,b);
end
aviobj=close(aviobj);
mplay('myAVI\myAVI.avi');

逆置乱：

%特定帧的帧内逆置乱
%2013-9-19
clc;
clear all;
aviobj=avifile('myAVI\myAVI');
aviobj.Quality=100;
aviobj.compression='None';
mov=mmreader('aviVideo\myAVI.avi');     %用mmreader读入视频文件  50帧
mySize=read(mov,1);
[m n]=size(mySize);
nShort=n/3;    %彩色图像的其中一帧
%产生混沌序列
%产生第一个混沌序列
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
[lsort,lindex]=sort(l);
[lsort,invertlindex]=sort(lindex);
%产生第2个混沌序列
l(1)=0.99;
for i=2:m*nShort
    l(i)=1-2*l(i-1)*l(i-1);
end
[lsort,lindex2]=sort(l);
[lsort,invertlindex2]=sort(lindex2);
%产生第3个混沌序列
l(1)=0.92;
for i=2:m*nShort
    l(i)=1-2*l(i-1)*l(i-1);
end
[lsort,lindex3]=sort(l);
[lsort,invertlindex3]=sort(lindex3);
% b1=ones(m,n,3);
% b3=b1;
begin=5;  %开始置乱的帧数
myEnd=10;   %结束置乱的帧数
for i=1:begin-1
    b=read(mov,i);
    aviobj=addframe(aviobj,b);
end
%%%%%%%%%%%%%%%置乱
for i=begin:myEnd       %将特定帧置乱
    b=read(mov,i);
    %彩色图像中的R层
    b1=reshape(b(:,:,1),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(invertlindex(k));
    end
    b3(:,:,1)=reshape(b2,m,nShort);
    %彩色图像中的G层
    b1=reshape(b(:,:,2),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(invertlindex2(k));
    end
    b3(:,:,2)=reshape(b2,m,nShort);
        %彩色图像中的B层置乱
    b1=reshape(b(:,:,3),1,m*nShort);
    for k=1:m*nShort
        b2(k)=b1(invertlindex3(k));
    end
    b3(:,:,3)=reshape(b2,m,nShort);
    %     b2=reshape(b1,m,n);
    aviobj=addframe(aviobj,b3);
end
%%%%%%%%%%%%%%%置乱
for i=myEnd+1:mov.numberofframes
    b=read(mov,i);
    aviobj=addframe(aviobj,b);
end
aviobj=close(aviobj);
mplay('myAVI\myAVI.avi');