公路交通标志（限速）分割和识别的仿真系统Untitled52.zip

% 测试霍夫变换 clc clear close all % 读取图像 I = imread('公路限速标志.jpg'); rotI = imrotate(I,80,'crop'); % 旋转33度，保持原图片大小 fig1 = imshow(rotI); % 提取边 BW = edge(rotI,'canny'); figure, imshow(BW); % 霍夫变换 [H,theta,rho] = hough(BW); % 计算二值图像的标准霍夫变换，H为霍夫变换矩阵，theta,rho为计算霍夫变换的角度和半径值 figure, imshow(imadjust(mat2gray(H)),[],'XData',theta,'YData',rho,... 'InitialMagnification','fit'); xlabel('\theta (degrees)'), ylabel('\rho'); axis on, axis normal, hold on; colormap(hot) % 显示霍夫变换矩阵中的极值点 P = houghpeaks(H,50,'threshold',ceil(0.3*max(H(:)))); % 从霍夫变换矩阵H中提取5个极值点 x = theta(P(:,2)); y = rho(P(:,1)); plot(x,y,'s','color','black'); % 找原图中的线 lines = houghlines(BW,theta,rho,P,'FillGap',18,'MinLength',180); figure, imshow(rotI), hold on max_len = 0; for k = 1:length(lines) % 绘制各条线 xy = [lines(k).point1; lines(k).point2]; plot(xy(:,1),xy(:,2),'LineWidth',2,'Color','green'); % 绘制线的起点（黄色）、终点（红色） plot(xy(1,1),xy(1,2),'x','LineWidth',2,'Color','yellow'); plot(xy(2,1),xy(2,2),'x','LineWidth',2,'Color','red'); % 计算线的长度，找最长线段 len = norm(lines(k).point1 - lines(k).point2); if ( len > max_len) max_len = len; xy_long = xy; end end % 以红色线高亮显示最长的线 plot(xy_long(:,1),xy_long(:,2),'LineWidth',2,'Color','red');