How can I calculate the mean of a particular number of video frames?

I am doing a project on video processing.For that,at first I have completed shot detection.Now i want to select a single frame from every shot.Say,first 100 frames contains one shot.So i want to calculate the mean value of the pixels(row,column) of that 100 frames.Then I shall compare the mean value with all that 100 frames and select the frame which one have the closest value.Please help me with the code.

Answer 1

[Image Analyst]

Try the attached. I believe it does what you want.

[Arnav]

Many many thanks for your help Image Analyst.It is really very very helpful..It works perfectly.

[Arnav]

@Image Analyst,Sir I have doubt.When I am using starting frame before 100,I mean till 99th frame as a starting frame,the code has worked perfectly.But at that very moment when I am using frame no after 100 like 101,400 whatever.It is not showing the result.Will you help me please?

Answer 2

[Youssef Khmou]

hi,

if it is grayscale Video then :

 [m,n,p]=size(X);
 MEAN=zeros(1,p);

 for x=1:p
 MEAN(x)=mean(X(:,:,x));
 end

[Arnav]

Thanks for the help Youssef..:)

Answer 3

[pavithra g]

how to calculate the mean of 1 to 5 frames for grayscale image.

[Image Analyst]

theMean = sum(double(frame1(:))+double(frame2(:))+double(frame3(:))+double(frame4(:))+double(frame5(:)))/5