I am new i am new to MATLAB. i am working on image processing

Can anyone please give me a code for keyframe extraction from videos. I tried a lot using colorhistogram difference method but I am not able to implement it. Please provide me code for keyframe extraction, I need this for my project work.

[Geoff Hayes]

Pritesh - why not discuss the problems that you are having with the colour histogram difference method? What is causing a problem with the implementation of this algorithm?

[pritesh patel]

Hello Geoff Hayes, I attached a file(code). In this file I am extracting keyframes from input video and store them in drive(D:\). ---------------------------------%ERROR----------------------------------------------------------------------------------- function definitions are not permitted in this context. --------------------------------------------------------------------------------------------------------------------------------------- Please help.

[Geoff Hayes]

Pritesh - your attached file shows that there is some code that precedes the function signature for absdif, and so the error message makes sense. If you want to include a function within your keyframe script, then it can only be done so if it is nested within another function or if it follows a function that has already been defined. Try modifying your code to fit one of these two formats.

[pritesh patel]

Thanks Geoff. The above mentioned error is resolved but I got new error. Please see that.... -------------------------------------%ERROR------------------------------------------------------------------------------------ Subscript indices must either be real positive integers or logicals.

Error in keyframes1 (line 11) X(k)=sss;

 -------------------------------------------------------------------------
The code is attached as keyframes1.m.

[Geoff Hayes]

Pritesh - you didn't attach a file. The error message is telling you that you are trying to index X with a k that is something that is neither a positive integer (greater than or equal to one) nor a logical. Try stepping through the code to see what this value for k is and why.

[pritesh patel]

Sorry Geoff, Now here is attached file names keyframes1.m Ya I got the cause of error. I used logical(sss) to get rid of this error but it not worked (in line 11). Can you fix it for me. Please see that......

[Image Analyst]

If you don't know how to "Try stepping through the code to see what this value for k is" then see this link - it will be a lot faster than waiting for Geoff to answer.

[rujul mankad]

"threshold=std+mean*4 " for this how can we identify that it should be 4..and can we give global threshold?

[Image Analyst]

If you want the threshold to be exactly 4, then just assign 4 to it.

threshold = 4;

Answer 1

[Image Analyst]

Put this line at the beginning of keyframe.m

function keyframe()