While loop does not give me back the value

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Eliska Paulikova
Eliska Paulikova 2022-10-25
评论： Eliska Paulikova 2022-10-25
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 个评论
显示 2更早的评论
Jan
Jan 2022-10-25
"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.
Eliska Paulikova
Eliska Paulikova 2022-10-25
Unrecognized function or variable "Rpokus"
In line 72 so the last line where is imshow(Rpokus)

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回答（1 个）

Jan
Jan 2022-10-25
编辑：Jan 2022-10-25
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)?

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