While loop does not give me back the value
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I need to imshow the Rpokus, but matlab says that is not exist please help
vid=VideoReader("video.mp4");
k=200;
while hasFrame(vid)
frame=readFrame(vid);
numberOfFrames = vid.NumFrames;
framesToRead = 1:k: numberOfFrames;
for h = 1:length(framesToRead)
i=1;
while i<length(h)
thisFrame = read(vid, framesToRead(h));
RPokus=im2gray(thisFrame);
nHood=true(3);
Rpokus=rangefilt(gray,nHood);
Rpokus=medfilt2(Rpokus,[7 7]);
Rpokus=imfill(Rpokus,"holes");
SE=strel("disk",6);
Rpokus=imclose(Rpokus,SE);
Rpokus=imbinarize(Rpokus);
Rpokus = bwareaopen(Rpokus, 200); %vše tvořený méně než "n" pixely se odstraní
Rpokus=imclearborder(Rpokus);
clear edge
Rpokus=edge(Rpokus);
i=i+1;
end
end
end
imshow(Rpokus)
4 Kommentare
Jan
am 25 Okt. 2022
"It says that the value or function Rpokus does not exist" - sorry, this is not useful. Do not paraphrase what you understand of the messge, but post a copy of the complete message, which also mentions exactly, in which line the error occurs.
"Because i need the value Rpokus will be remembered." - as I have written in my answer, the loop is not entered. But if you fix this problem, Rpokus is overwritten in each loop iteration. If you want to store it, store it in an array.
Antworten (1)
Jan
am 25 Okt. 2022
Bearbeitet: Jan
am 25 Okt. 2022
for h = 1:length(framesToRead)
i=1;
while i<length(h)
The while loop is not entered. h is a scalar, so length(h) is 1 in all cases. After i=1, i is never smaller than 1.
Use the debugger to identify such problems. Set a breakpoint in the first line of the code and step through program line by line. Then you will see, that the contents of the while loop is nocht reached.
By the way, the contents of the while loop does not depend on i. So wouldn't it process the same data repeatedly (if it is entered at all)?
2 Kommentare
Image Analyst
am 25 Okt. 2022
The while loop never gets entered so Rpokus is never instantiated so that's why you get the error. Here, invest some time here:
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