Hi sorry im new to image processing. Need some explanation , which 2 video attachment should I use for this MATLAB code and which reference image i should use? thank you

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Amirullah Bin Abdul Razak
评论： Walter Roberson 2023-1-22
clc;
close all;
inputvideo=vision.VideoFileReader('traffic.avi');%<<<<<<<<<<<<
vid1=vision.VideoPlayer;
while~isDone(inputvideo)
frame1=step(inputvideo);
step(vid1,frame1);
pause(0.005);
end
imwrite(frame1,'D:\referenceimage.jpg','jpg');%<<<<<<<<<<<<<<
release(inputvideo);
release(vid1);
referenceimage=imread('D:\referenceimage.jpg');<<<<<<<<<<<<
vid2=vision.VideoFileReader('Traffic.avi');%<<<<<<<<<<<<<
X=zeros(2,121);
Y=zeros(2,121);
Z=zeros;
for i=2:121
clc
frame=step(vid2);
frame2=((im2double(frame))-(im2double(referenceimage)));
frame1=im2bw(frame2,0.2);
[labelimage]=bwlabel(frame1);
stats=regionprops(labelimage,'basic');
BB=stats.BoundingBox;
X(i)=BB(1);
Y(i)=BB(2);
Dist=((X(i)-X(i-1))^2+(Y(i)-Y(i-1))^2)^(1/2);
Z(i)=Dist;
if(Dist>10&&Dist<20)
display('MEDIUM SPEED');
elseif(Dist<10)
display('SLOW SPEED');
else
display('FAST SPEED');
end
S=strel('disk',6);
frame3=imclose(frame1,S);
step(vid1,frame1);
pause(0.05);
end
M=median(Z);
Speed=(M)*(120/8);
release(vid1)

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回答（1 个）

Walter Roberson
Walter Roberson 2023-1-19
traffic.avi is supplied with the Image Processing Toolbox.
The code reads and displays the content of the avi. The last frame is written to a file and then the file is read back in. It is not clear why the code bothers to write to a file and read back when it could have just used the content of frame1
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Amirullah Bin Abdul Razak
Amirullah Bin Abdul Razak 2023-1-22
Hi ,
Should I just delete off these two lines of just leave as it is from the program code? ''
imwrite(frame1,'D:\referenceimage.jpg','jpg');%<<<<<<<<<<<<<<
release(inputvideo);
release(vid1);
referenceimage=imread('D:\referenceimage.jpg');<<<<<<<<<<<<
vid2=vision.VideoFileReader('Traffic.avi');%<<<<<<<<<<<<<
X=zeros(2,121);
Y=zeros(2,121);
Z=zeros;
for i=2:121
clc
frame=step(vid2);
frame2=((im2double(frame))-(im2double(referenceimage)));
Walter Roberson
Walter Roberson 2023-1-22
FramesToProcess = 121; %don't ask me why
videoname = 'traffic.avi';
inputvideo = VideoReader(videoname);
vid1 = vision.VideoPlayer;
while hasFrame(inputvideo)
frame1 = readFrame(inputvideo);
step(vid1,frame1);
pause(0.005);
end
referenceimage = frame1;
inputvideo.CurrentTime = 0; %reset to beginning instead of release and reopen
vidlength = inputvideo.NumFrames;
if vidlength < FramesToProcess
clear inputvideo
error('video only has %d frames, need %d', vidlength, FramesToProcess);
end
X = zeros(2,FramesToProcess);
Y = zeros(2,FramesToProcess);
Z=zeros;
for i = 2:FramesToProcess
frame = read(inputvideo, i);
frame2=((im2double(frame))-(im2double(referenceimage)));
frame1=im2bw(frame2,0.2);
[labelimage]=bwlabel(frame1);
stats=regionprops(labelimage,'basic');
BB=stats.BoundingBox;
X(i)=BB(1);
Y(i)=BB(2);
Dist=((X(i)-X(i-1))^2+(Y(i)-Y(i-1))^2)^(1/2);
Z(i)=Dist;
if(Dist>10&&Dist<20)
display('MEDIUM SPEED');
elseif(Dist<10)
display('SLOW SPEED');
else
display('FAST SPEED');
end
S=strel('disk',6);
frame3=imclose(frame1,S);
step(vid1, frame3); %not frame1 !
pause(0.05);
end
M=median(Z);
Speed=(M)*(120/8);
release(vid1)
clear inputvideo

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