Does anyone can explain this code, i am doing a project regrading to color ball track

[umagon]

[MATLAB] Does anyone can explain this code, color ball tracking

Does anyone can explain this code, i am doing a project regrading to color ball tracking with MATLAB image processing toolbox


im=getingdata(vid,1);
imshow(im);
default=0;
%Image converted to ycbcr format from rgb since this format separates
%intensity from color
im_new=rgb2ycbcr(im);
sz=size(im_new);
m=sz(1,1);
n=sz(1,2);
%Creating a binary matrix binred. Value of an element is 1 only if color is
%red for that position
binred=zeros(m,n);
%num is number of pixels
num=0;
%Center of red object initialized to (I,J)=(0,0)
I=0;J=0;
output='n'; %default output n:No steering, DC motor OFF
for i=1:m
for j=1:n
%IF statement decides if pixel is only red (& not other color)
if(im_new(i,j,3)>180 && im_new(i,j,2)<140 )
%RGB sequence
binred(i,j)=1; num=num+1;
I=I+i;
J=J+j;
end
end
end


i dont quite understand this line if(im_new(i,j,3)>180 && im_new(i,j,2)<140 )

anyone??? thanks in advance

 

[devilwar]

cb=140;
cr=180;

for i=1:256
for j=1:256
for y=1:256
im(i,j,3)=uint8(cr);
im(i,j,2)=uint8(cb);
im(i,j,1)=uint8;
end
end
end

imshow(im);


Run this program...The colour output you get is the one which is to be traced as I get from this program.

 

[umagon]

cb=140;
cr=180;

for i=1:256
for j=1:256
for y=1:256
im(i,j,3)=uint8(cr);
im(i,j,2)=uint8(cb);
im(i,j,1)=uint8;
end
end
end

imshow(im);


Run this program...The colour output you get is the one which is to be traced as I get from this program.

i see, so the meaning of this does not show the range of the color? bcoz if no threshold the program only recognize this color as "red"

 

[devilwar]

i see, so the meaning of this does not show the range of the color? bcoz if no threshold the program only recognize this color as "red"

Thats what I suppose so. I guess this might be a program for a line follower or something similar to that as becoz I se a output which is going to a DC motor(may be a differential motor such that the detection may follow a red colour line. Although I am not sure.