MATLAB 视频转图像算法

%function [filename,pathname,fileindex]  by vincent 
[filename,pathname,fileindex]= uigetfile('B*.avi','C:\Users\sunboy\Desktop\file\B','video.avi','Multiselect','on');
%'video.avi'
if ischar(filename) %只有选择了文件才进行以下计算
video=mmreader([pathname filename]);
%%General Settings:
%Duration 时间
%Name 视频名称
%Path 路径
%Tag =
%Type = mmreader
%UserData = []
%%Video Settings:
%BitsPerPixel=24
%FrameRate 视频采集速率
%Height 高度
%NumberOfFrames 总帧数
%VideoFormat 图像模式
%Width = 宽度
LEN=video.NumberOfFrames; %获得视频长度
dir=strcat(pathname,strrep(filename,'.avi',''),'\pic');
mkdir(dir);
fn=strrep(filename,'.avi','');
for k=1:LEN-1 %若read 到len，常会报错如下???MATLAB:read:readTimedOut，read 到len-1 就好了
frame=rgb2gray(read(video,k));
if k<10
imwrite(frame,strcat(dir,'\',fn,'-avi-000',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=10 && k<100
imwrite(frame,strcat(dir,'\',fn,'-avi-00',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=100 && k<1000
imwrite(frame,strcat(dir,'\',fn,'-avi-0',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=1000 && k<10000
imwrite(frame,strcat(dir,'\',fn,'-avi-',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
end
end
elseif iscell(filename)
navi=length(filename);
for n=1:navi
video=mmreader([pathname filename{n}]);
%%General Settings:
%Duration 时间
%Name 视频名称
%Path 路径
%Tag =
%Type = mmreader
%UserData = []
%%Video Settings:
%BitsPerPixel=24
%FrameRate 视频采集速率
%Height 高度
%NumberOfFrames 总帧数
%VideoFormat 图像模式
%Width = 宽度
LEN=video.NumberOfFrames; %获得视频长度
dir=strcat(pathname,strrep(filename{n},'.avi',''),'\pic');
mkdir(dir);
fn=strrep(filename{n},'.avi','');
for k=1:LEN-1 %若read 到len，常会报错如下???MATLAB:read:readTimedOut，独到len-1 就好了
frame=rgb2gray(read(video,k));
if k<10
imwrite(frame,strcat(dir,'\',fn,'-avi-000',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=10 && k<100
imwrite(frame,strcat(dir,'\',fn,'-avi-00',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=100 && k<1000
imwrite(frame,strcat(dir,'\',fn,'-avi-0',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
elseif k>=1000 && k<10000
imwrite(frame,strcat(dir,'\',fn,'-avi-',int2str(k),'.bmp'),'bmp');%把每帧图像存入硬盘
end
end
disp(strcat(num2str(n),'/',num2str(navi),' :"',filename{n},'" Finished!',datestr(now,13)));
end
else
return
end
msgbox('所有帧提取完毕,已写入磁盘！','提示');