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locate2.m
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function [result,plate,rs,cs,h,w]=locate(input)
%% prepare data
origimg=input;
%origimgin=imread(input);
%[height,width]=size(origimgin);
% resizee=floor(width*800/height/3);
% origimg = imresize(origimgin, [800 resizee]);
[height,width]=size(origimg);
bw=zeros(height,width/3);
pixel=height*width/3;
%{
%% image pre-process
r_row = sort(reshape(origimg(:,:,1),[pixel,1]));
g_row = sort(reshape(origimg(:,:,2),[pixel,1]));
b_row = sort(reshape(origimg(:,:,3),[pixel,1]));
r_topmark=(sum(r_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75)))/255;
g_topmark=(sum(g_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75)))/255;
b_topmark=(sum(b_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75)))/255;
img = imadjust(origimg,[.3 .3 .3; r_topmark g_topmark b_topmark],[]);
%}
img = imadjust(origimg,[.3 .3 .3; 1 1 1],[]);
%{
%% use 12.5% as white
r_row = sort(reshape(img(:,:,1),[pixel,1]));
g_row = sort(reshape(img(:,:,2),[pixel,1]));
b_row = sort(reshape(img(:,:,3),[pixel,1]));
%r_topmark=r_row(floor(pixel*0.875));
%g_topmark=g_row(floor(pixel*0.875));
%b_topmark=b_row(floor(pixel*0.875));
r_topmark=sum(r_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75));
g_topmark=sum(g_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75));
b_topmark=sum(b_row(floor(pixel*0.75):pixel))/(pixel-floor(pixel*0.75));
%% find white
%{
for i=1:(height)
for j=1:(width/3)
check=(img(i,j,1)>r_topmark)+(img(i,j,2)>g_topmark)+(img(i,j,3)>b_topmark);
if check>1
bw(i,j)=1;
end
end
end
%}
for i=1:height
for j=1:(width/3)
check=(img(i,j,1)>r_topmark)+(img(i,j,2)>g_topmark)+(img(i,j,3)>b_topmark);
if (img(i,j,1)>r_topmark)&&(img(i,j,2)>g_topmark) || (img(i,j,3)>b_topmark)&&(img(i,j,2)>g_topmark) || (img(i,j,1)>r_topmark)&&(img(i,j,3)>b_topmark)
bw(i,j)=1;
end
end
end
%}
%threshold=graythresh(img);
bw=im2bw(img);
% undot
undot=ceil(pixel*0.00001);
newbw=bwareaopen(~bw,undot);
newbw=~newbw;
%newbw=bw;
% label
[bw_cont,num_cont]=bwlabel(newbw);
for i=1:num_cont
[r,c]=find(bw_cont==i);
xr=max(r);
nr=min(r);
xc=max(c);
nc=min(c);
htemp=xr-nr;
wtemp=xc-nc;
ratio=wtemp/htemp;
if ratio>1.5 && ratio<4
temp=newbw(nr:xr,nc:xc);
turn = countturn(temp);
if turn>10 && turn<=25
%platebw=newbw(min(r):max(r),min(c):max(c));
%platepre=origimg(min(r):max(r),min(c):max(c));
%plate=rotate(platebw,platepre);
platte=origimg(nr:xr,nc:xc,:);
result_temp=readnumber2(platte);
if result_temp~=('x')
rs=nr;
cs=nc;
h=htemp;
w=wtemp;
result=result_temp;
plate=platte;
break;
end
end
end
end
if exist('plate','var')==0
plate=0;
rs=0;
cs=0;
h=0;
w=0;
result='x';
end
function turn=countturn(imgin)
imgin=~imgin;
[h,w]=size(imgin);
high=ceil(h*0.55);
low=ceil(h*0.45);
turn=0;
b=zeros(1,w);
for i=1:w
if sum(imgin(low:high,i))==0
b(i)=0;
else
b(i)=1;
end
end
for i=1:w-1
if (b(i)~=b(i+1))
turn=turn+1;
end
end
function final=rotate(ref,todo)
[h,w]=size(ref);
state=0;
low=h;
while state==0
if ref(low,1)==0
low=low-1;
else
state=1;
end
end
high=floor(low/2);
right=1;
state=0;
while state==0
if ref(high,right)==0
right=right+1;
else
state=1;
end
end
angle=radtodeg(atan(right/high));
if angle>1
if angle<45
afterrotate=imrotate(todo,angle);
cut=low*sin(angle*pi/180);
else
afterrotate=imrotate(todo,angle-45);
cut=(h-low)*sin((angle-45)*pi/180);
end
[ah,aw]=size(afterrotate);
addcut=aw*0.025;
final=afterrotate(:,cut+addcut:aw-cut-addcut);
else
final=todo;
end