車道線檢測是自動駕駛汽車以及一般計算機視覺的關鍵組件。這個概念用于描述自動駕駛汽車的路徑并避免進入另一條車道的風險。

在本文中，我們將構建一個機器學習項目來實時檢測車道線。我們將使用 OpenCV 庫使用計算機視覺的概念來做到這一點。為了檢測車道，我們必須檢測車道兩側的白色標記。

使用 Python 和 OpenCV 進行道路車道線檢測使用 Python 中的計算機視覺技術，我們將識別自動駕駛汽車必須行駛的道路車道線。這將是自動駕駛汽車的關鍵部分，因為自動駕駛汽車不應該越過它的車道，也不應該進入對面車道以避免事故。

幀掩碼和霍夫線變換要檢測車道中的白色標記，首先，我們需要屏蔽幀的其余部分。我們使用幀屏蔽來做到這一點。該幀只不過是圖像像素值的 NumPy 數組。為了掩蓋幀中不必要的像素，我們只需將 NumPy 數組中的這些像素值更新為 0。

制作后我們需要檢測車道線。用于檢測此類數學形狀的技術稱為霍夫變換?；舴蜃儞Q可以檢測矩形、圓形、三角形和直線等形狀。

代碼下載源碼請下載：車道線檢測項目代碼

按照以下步驟在 Python 中進行車道線檢測：

1.導入包

import matplotlib.pyplot as pltimport numpy as npimport cv2import osimport matplotlib.image as mpimgfrom moviepy.editor import VideoFileClipimport math

2. 應用幀屏蔽并找到感興趣的區域：

def interested_region(img, vertices): if len(img.shape) > 2: mask_color_ignore = (255,) * img.shape[2] else:mask_color_ignore = 255 cv2.fillPoly(np.zeros_like(img), vertices, mask_color_ignore) return cv2.bitwise_and(img, np.zeros_like(img))

3.霍夫變換空間中像素到線的轉換：

def hough_lines(img, rho, theta, threshold, min_line_len, max_line_gap): lines = cv2.HoughLinesP(img, rho, theta, threshold, np.array([]), minLineLength=min_line_len, maxLineGap=max_line_gap) line_img = np.zeros((img.shape[0], img.shape[1], 3), dtype=np.uint8) lines_drawn(line_img,lines) return line_img

4. 霍夫變換后在每一幀中創建兩條線：

def lines_drawn(img, lines, color=[255, 0, 0], thickness=6): global cache global first_frame slope_l, slope_r = [],[] lane_l,lane_r = [],[] α =0.2 for line in lines:for x1,y1,x2,y2 in line: slope = (y2-y1)/(x2-x1) if slope > 0.4:slope_r.append(slope)lane_r.append(line) elif slope < -0.4:slope_l.append(slope)lane_l.append(line)img.shape[0] = min(y1,y2,img.shape[0]) if((len(lane_l) == 0) or (len(lane_r) == 0)):print (’no lane detected’)return 1 slope_mean_l = np.mean(slope_l,axis =0) slope_mean_r = np.mean(slope_r,axis =0) mean_l = np.mean(np.array(lane_l),axis=0) mean_r = np.mean(np.array(lane_r),axis=0)if ((slope_mean_r == 0) or (slope_mean_l == 0 )):print(’dividing by zero’)return 1x1_l = int((img.shape[0] - mean_l[0][1] - (slope_mean_l * mean_l[0][0]))/slope_mean_l) x2_l = int((img.shape[0] - mean_l[0][1] - (slope_mean_l * mean_l[0][0]))/slope_mean_l) x1_r = int((img.shape[0] - mean_r[0][1] - (slope_mean_r * mean_r[0][0]))/slope_mean_r) x2_r = int((img.shape[0] - mean_r[0][1] - (slope_mean_r * mean_r[0][0]))/slope_mean_r) if x1_l > x1_r:x1_l = int((x1_l+x1_r)/2)x1_r = x1_ly1_l = int((slope_mean_l * x1_l ) + mean_l[0][1] - (slope_mean_l * mean_l[0][0]))y1_r = int((slope_mean_r * x1_r ) + mean_r[0][1] - (slope_mean_r * mean_r[0][0]))y2_l = int((slope_mean_l * x2_l ) + mean_l[0][1] - (slope_mean_l * mean_l[0][0]))y2_r = int((slope_mean_r * x2_r ) + mean_r[0][1] - (slope_mean_r * mean_r[0][0])) else:y1_l = img.shape[0]y2_l = img.shape[0]y1_r = img.shape[0]y2_r = img.shape[0] present_frame = np.array([x1_l,y1_l,x2_l,y2_l,x1_r,y1_r,x2_r,y2_r],dtype ='float32')if first_frame == 1:next_frame = present_framefirst_frame = 0 else :prev_frame = cachenext_frame = (1-α)*prev_frame+α*present_frame cv2.line(img, (int(next_frame[0]), int(next_frame[1])), (int(next_frame[2]),int(next_frame[3])), color, thickness) cv2.line(img, (int(next_frame[4]), int(next_frame[5])), (int(next_frame[6]),int(next_frame[7])), color, thickness)cache = next_frame

5.處理每一幀視頻以檢測車道：

def weighted_img(img, initial_img, α=0.8, β=1., λ=0.): return cv2.addWeighted(initial_img, α, img, β, λ)def process_image(image): global first_frame gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) img_hsv = cv2.cvtColor(image, cv2.COLOR_RGB2HSV) lower_yellow = np.array([20, 100, 100], dtype = 'uint8') upper_yellow = np.array([30, 255, 255], dtype='uint8') mask_yellow = cv2.inRange(img_hsv, lower_yellow, upper_yellow) mask_white = cv2.inRange(gray_image, 200, 255) mask_yw = cv2.bitwise_or(mask_white, mask_yellow) mask_yw_image = cv2.bitwise_and(gray_image, mask_yw) gauss_gray= cv2.GaussianBlur(mask_yw_image, (5, 5), 0) canny_edges=cv2.Canny(gauss_gray, 50, 150) imshape = image.shape lower_left = [imshape[1]/9,imshape[0]] lower_right = [imshape[1]-imshape[1]/9,imshape[0]] top_left = [imshape[1]/2-imshape[1]/8,imshape[0]/2+imshape[0]/10] top_right = [imshape[1]/2+imshape[1]/8,imshape[0]/2+imshape[0]/10] vertices = [np.array([lower_left,top_left,top_right,lower_right],dtype=np.int32)] roi_image = interested_region(canny_edges, vertices) theta = np.pi/180 line_image = hough_lines(roi_image, 4, theta, 30, 100, 180) result = weighted_img(line_image, image, α=0.8, β=1., λ=0.) return result

6. 將輸入視頻剪輯成幀并得到結果輸出視頻文件：

first_frame = 1white_output = ’__path_to_output_file__’clip1 = VideoFileClip('__path_to_input_file__')white_clip = clip1.fl_image(process_image)white_clip.write_videofile(white_output, audio=False)

車道線檢測項目 GUI 代碼：

import tkinter as tkfrom tkinter import *import cv2from PIL import Image, ImageTkimport osimport numpy as npglobal last_frame1 last_frame1 = np.zeros((480, 640, 3), dtype=np.uint8)global last_frame2 last_frame2 = np.zeros((480, 640, 3), dtype=np.uint8)global cap1global cap2cap1 = cv2.VideoCapture('path_to_input_test_video')cap2 = cv2.VideoCapture('path_to_resultant_lane_detected_video')def show_vid(): if not cap1.isOpened(): print('cant open the camera1') flag1, frame1 = cap1.read() frame1 = cv2.resize(frame1,(400,500)) if flag1 is None:print ('Major error!') elif flag1:global last_frame1last_frame1 = frame1.copy()pic = cv2.cvtColor(last_frame1, cv2.COLOR_BGR2RGB) img = Image.fromarray(pic)imgtk = ImageTk.PhotoImage(image=img)lmain.imgtk = imgtklmain.configure(image=imgtk)lmain.after(10, show_vid)def show_vid2(): if not cap2.isOpened(): print('cant open the camera2') flag2, frame2 = cap2.read() frame2 = cv2.resize(frame2,(400,500)) if flag2 is None:print ('Major error2!') elif flag2:global last_frame2last_frame2 = frame2.copy()pic2 = cv2.cvtColor(last_frame2, cv2.COLOR_BGR2RGB)img2 = Image.fromarray(pic2)img2tk = ImageTk.PhotoImage(image=img2)lmain2.img2tk = img2tklmain2.configure(image=img2tk)lmain2.after(10, show_vid2)if __name__ == ’__main__’: root=tk.Tk() lmain = tk.Label(master=root) lmain2 = tk.Label(master=root) lmain.pack(side = LEFT) lmain2.pack(side = RIGHT) root.title('Lane-line detection')root.geometry('900x700+100+10') exitbutton = Button(root, text=’Quit’,fg='red',command= root.destroy).pack(side = BOTTOM,) show_vid() show_vid2() root.mainloop() cap.release()

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