Finding the average background frame from a video sequence

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Algorithms Analyst
Algorithms Analyst 2013-3-15
回答： James 2013-10-27
Hi everyone
I have a video seqence and I want to apply the running average equation on this video sequence to estimate the background frame.let say I have a sequence of frames like
source=VideoReader('myvideo.avi'); frames=source.Numberofframes; for f=1:frames thisframe=read(source,f);
end
As I know that frames is equal to total number of frames in this video and f is changing after evry iteration now how can I find the average background frame which is
backgroundframe=(frame1+frame2+frame3+....+N)./frames;as in this case total number of frames are 1020. so it becomes
backgroundframe=(frame1+frame2+frame3+....+N)./1020.
how can i apply this equation.
Thanks

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回答（1 个）

James
James 2013-10-27
Hi Algorithms Analyst, this is of interest to me because I'm trying to do something similar. I use a system command to run ffmpeg (www.ffmpeg.org/) to retrieve frames from the video, then average them by summing in a loop using 'imadd.m' and dividing the final sum.
Frames = uint32(imread(strcat(Folder, File_basename, num2str(1), Frame_ext)) );
for i = 1:(length(dir([Folder,File_basename)], '*',Frame_ext));
Frames = imadd(Frames,uint32(imread(strcat(Folder,File_basename,num2str(i,'%04d'), Frame_ext))) );
end
AveFrames=uint8(imdivide(AveSAMPLEFrames,length(dir([Folder,File_basename)], '*',Frame_ext)) ));
Works pretty well for me when the object is moving and lighting stays relatively constant. Not the fastest method though. Would be interested to hear if you found any better solutions since this post.

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