Extracting text from a video

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Zakíe Assad
Zakíe Assad 2022-11-3
评论： KSSV 2022-11-3
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!

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回答（2 个）

Cris LaPierre
Cris LaPierre 2022-11-3
You'll need to use OCR (optical character recognition). See this page: https://www.mathworks.com/help/vision/ug/recognize-text-using-optical-character-recognition-ocr.html
You can find more details and some examples here: https://www.mathworks.com/help/vision/text-detection-and-recognition.html
You may also find the answers in this post helpful: https://www.mathworks.com/matlabcentral/answers/24685-text-detection-extraction-in-video
KSSV
KSSV 2022-11-3
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 个评论
Zakíe Assad
Zakíe Assad 2022-11-3
Hi! Thanks for uor help. I found a problem in the last line, when I excute it, it says: 'Unable to perform assignmente because the left and right sides have a differente number of elements'. Can you help me with this, please?
KSSV
KSSV 2022-11-3
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.
Thanks is accepting/ voting the answer.

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