Extracting text from a video

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Zakíe Assad
Zakíe Assad on 3 Nov 2022
Commented: KSSV on 3 Nov 2022
I need to extract from the videos the 'Max' values that appear on green on the right part of the screen. I need to make a temperature curve using this values. Really don't know how to extract the text from each of the frames of the video.
Thanks in advance!

Answers (2)

Cris LaPierre
Cris LaPierre on 3 Nov 2022

KSSV
KSSV on 3 Nov 2022
v = VideoReader('Large_Patron_Trim\Large_Patron_Trim.mp4');
N = v.NumFrames ; % Total number of rames
ROI = [1008 215 50 32]; % REgion of interest. Found out using imcrop as this region is same in every frame
Tmax = zeros(N,1) ; % initialie the required
% loop for each frame
for i = 1:N
fprintf('At %d frame of %d frames\n',i,N) ;
frame = read(v,i); % REad the frame
str = ocr(frame,ROI) ; % get the value using ocr
Tmax(i) = str2double(str.Words) ;
end
  2 Comments
KSSV
KSSV on 3 Nov 2022
Explore the options of ocr....the problem would be that frame str.Words would have got two cell arrays.. Try to apply some logic to solve it.
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