Extracting text from a video

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!

Answer 1

[Cris LaPierre]

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

Answer 2

[KSSV]

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

[Zakíe Assad]

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]

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.