how to detect the objects from a video?

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aarthi ramasamy
aarthi ramasamy 2013-1-24
I have tried to convert the video into frames. And then to a binary images where the object is identified as a white patch,but I couldn't count the the objects. Moreover our project is based on the vehicle counting system using a ip camera. I dont have computer vision toolbox in matlab. Kindly,reply me back. This is the code,I have done so far,
**clc
clear all
% Read movie
SF = 1; %Starting Frame
MV = mmreader('a.avi'); %To read Movie EF = MV.NumberofFrames ; %Ending Frame img = read(MV,1); %reading particular frame A = double(rgb2gray(img)); %motion vector works on Gray Image formate [height width] = size(A); %Movie size?
% motion estimation h1 = figure(1); for f = SF: EF %Frame from SF To EF B = A; img = read(MV,f); A = double(rgb2gray(img));
%Foreground Detection
thresh=11;
fr_diff = abs(A-B);
for j = 1:width
for k = 1:height
if (fr_diff(k,j)>thresh)
fg(k,j) = A(k,j);
else
fg(k,j) = 0;
end
end
end
subplot(2,2,1) , imagesc(img), title (['Orignal Sequence Frame#',int2str(f)]);
subplot(2,2,2) , imshow(mat2gray(A)), title ('Previous Frame');
subplot(2,2,3) , imshow(mat2gray(B)), title ('Next Frame');
sd=imadjust(fg);
level=graythresh(sd);
m=imnoise(sd,'gaussian',0,0.025);
k=wiener2(m,[5,5]);
bw=im2bw(k,level);
subplot(2,2,4) , imagesc(bw), title ('Foreground');
hold off;
pause (.1);
% saveas(h1,strcat('Result-Paris-',num2str(f)),'jpg');
end**

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采纳的回答

jasche
jasche 2013-1-24
can you post a clearly intended code. Have you decided on an algorithm to binarize you input frames ?
One way to count targets can be to identify the maximum intensity point in the frame and find the connected region.
  2 个评论
Image Analyst
Image Analyst 2013-1-24
He used graythresh() which is a binarization routine.
aarthi ramasamy
aarthi ramasamy 2013-2-2
Since I'm new to matlab, I don't know how to implement the algorithms. My objective here is to count the objects that move in a video. Below code,converts the video into frames and then to grayscale . The grayscale frames are again converted into binary From where I can count the objects. But it leads to a wrong count. I'm failing in that part. I need your idea in solving the problem.
clc
clear all
n=0;
% Read movie
SF = 1; %Starting Frame
MV = mmreader('a.avi'); %To read Movie
EF = MV.NumberofFrames ; %Ending Frame
img = read(MV,1); %reading particular frame
A = double(rgb2gray(img)); %motion vector works on Gray Image formate
[height width] = size(A); %Movie size?
% motion estimation
h1 = figure(1);
for f = SF: EF %Frame from SF To EF
B = A;
img = read(MV,f);
A = double(rgb2gray(img));
%Foreground Detection
thresh=11;
fr_diff = abs(A-B);
for j = 1:width
for k = 1:height
if (fr_diff(k,j)>thresh)
fg(k,j) = 0;
else
fg(k,j) = A(k,j);
end
end
end
subplot(2,2,1) , imagesc(img), title (['Orignal Sequence Frame#',int2str(f)]);
subplot(2,2,2) , imshow(mat2gray(A)), title ('Previous Frame');
subplot(2,2,3) , imshow(mat2gray(B)), title ('Next Frame');
sd=imadjust(fg);
level=graythresh(sd);
m=imnoise(sd,'gaussian',0,0.025);
k=wiener2(m,[5,5]);
bw=im2bw(k,level);
[labeled,numObjects] = bwlabel(bw,4);
n=n+numObjects;
subplot(2,2,4) , imagesc(bw), title (['Foreground #',n]);
hold off;
pause (.1);
% saveas(h1,strcat('Result-Paris-',num2str(f)),'jpg');
end
disp(n);

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