霍夫變換和匹配_多次使用霍夫變換_Rachel Zhang的專(zhuān)欄
本文關(guān)鍵詞:霍夫變換,,由筆耕文化傳播整理發(fā)布。
在上一篇博客中發(fā)現(xiàn)經(jīng)過(guò)霍夫變換檢測(cè)出的直線有可能因?yàn)檐?chē)輛擋住路沿等原因斷開(kāi),形成線段,這樣就不好了,因?yàn)闄z測(cè)道路是要找直線焦點(diǎn)。
Thus it is necessary to combine 相同斜率的直線 and connect them.
本代碼提供了matlab下求取經(jīng)過(guò)霍夫變換的直線斜率,并將其聯(lián)合,代碼見(jiàn)下方,實(shí)驗(yàn)結(jié)果見(jiàn)文末。
% 入口圖像為 BW,出口圖像為f
%optimize from main_optimize, merely select 2 lines, one has positive
%slope,the other has negative slope
clear all,close all
BW=imread('D:\Images\NEW\img4b9faef664e03.jpg');
figure,imshow(BW);
BW=rgb2gray(BW);
%thresh=[0.01,0.17];
thresh=[0.01,0.10];
sigma=2;%定義高斯參數(shù)
f = edge(double(BW),'canny',thresh,sigma);
figure,subplot(121);
imshow(f,[]);
title('canny Edge Detect Result');
[H, theta, rho]= hough(f, 0.1);%cos(theta)*x+sin(theta)*y=rho
%imshow(theta,rho,H,[],'notruesize'),axis on,axis normal
%xlabel('\theta'),ylabel('rho');
[r,c]=houghpeaks(H,10);
hold on
lines=houghlines(f,theta,rho,r,c);
subplot(122);
imshow(f,[]),title('Hough Transform Detect Result'),hold on
nlind=0;%new line index
st=1;
%%%%%%%%%求斜率%%%%%%%%%%%%
for k=1:length(lines)
%xy=[lines(k).point1;lines(k).point2];
xielv(k)=(lines(k).point2(1)-lines(k).point1(1))/(lines(k).point2(2)-lines(k).point1(2)+0.0001)
end
%%%%%%%%%將相同斜率的直線連起來(lái)%%%%%%%%%%%%
k=1;
while(k<=length(lines))
if(k~=length(lines))
k=k+1;
end
while(abs(xielv(k)-xielv(k-1))<0.0001)
k=k+1;
if(k>length(lines))
break;
end
end
if(abs(xielv(k-1))<0.05||abs(xielv(k-1))>=10)%eliminate horizontal and vertical lines,防治水平線和樓房
st=k;
if(k~=length(lines))
continue;
end
end
if(st==length(lines)&&k==st)
if(abs(xielv(k))>0.05&&abs(xielv(k))<10)
nlind=nlind+1;
newlines(nlind)=lines(st);
newlines(nlind).point2=lines(k).point2;
newxy=[newlines(nlind).point1;newlines(nlind).point2];
plot(newxy(:,2),newxy(:,1),'LineWidth',4,'Color',[.6 1.0 .8]);
end
break;
end
%end=k-1,start=st; draw line
nlind=nlind+1;
newlines(nlind)=lines(st);
newlines(nlind).point2=lines(k-1).point2;
newxy=[newlines(nlind).point1;newlines(nlind).point2];
plot(newxy(:,2),newxy(:,1),'LineWidth',4,'Color',[.6 1.0 .8]);
st=k;
end
fprintf('%d lines are detected in sum.\n',nlind);
實(shí)驗(yàn)結(jié)果:
原圖:
未優(yōu)化的霍夫變換:
優(yōu)化后:
本文關(guān)鍵詞:霍夫變換,由筆耕文化傳播整理發(fā)布。
本文編號(hào):96154
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