video camera data processing

Hi,

I have a camera recorded video data.

how can i convert video camera data into time-series data?

Thank you!

Answer 1

[KALYAN ACHARJYA]

Convert the video in series of images (frames)

Here

https://in.mathworks.com/matlabcentral/answers/31845-convert-avi-file-to-series-of-images#answer_393156

Is that OK?

[garima sharma]

Thank you for reply.

it will convert video into image, but i want to extract pixel vs time information. eg cantlilever beam motion

Answer 2

[Bjorn Gustavsson]

Simplest way might be to use VideoReader:

vidObj = VideoReader('Your-video.mp4');

Frame1 = read(vidObj,1);
idx1toExtract = 12:27:size(Frame1,1);
idx2toExtrace = 17:37:size(Frame1,2);
for frameNR = vidObj.NumFrames:-1:1
  vidFrame = read(vidObj, frameNR);
  Couple_of_timeseries(:,:,frameNR) = vidFrame(idx1toExtract,idx2toExtract);
end
% Plot the time-series for one pixel:
plot(squeeze(Couple_of_timeseries(2,4,:)))

You'll have to generate an array for the time of the frames from the FrameRate or CurrentTime information in vidObj. For much of the remaining processing I typically cast the data from uint8 to double as soon as possible.

HTH

[garima sharma]

thank you for reply.

there is error, while running program:

"No appropriate method, property, or field 'NumFrames' for class 'VideoReader'.

Error in videoreader (line 5)

for frameNR = vidObj.NumFrames:-1:1"

I am new in image & video processing area,could you please explain little bit about program? and also how to generate FrameRate?

[Bjorn Gustavsson]

Which matlab-version are you using? In my 2020a version vidObj has these properties.

[garima sharma]

Sir, I am using R2016a.