(编辑:jimmy 日期: 2024/11/16 浏览:2)
本文实例为大家分享了python+opencv实现霍夫变换检测直线的具体代码,供大家参考,具体内容如下
python+opencv实现高斯平滑滤波
python+opencv实现阈值分割
功能:
创建一个滑动条来控制检测直线的长度阈值,即大于该阈值的检测出来,小于该阈值的忽略
注意:这里用的函数是HoughLinesP而不是HoughLines,因为HoughLinesP直接给出了直线的断点,在画出线段的时候可以偷懒
代码:
# -*- coding: utf-8 -*- import cv2 #两个回调函数 def HoughLinesP(minLineLength): global minLINELENGTH minLINELENGTH = minLineLength + 1 print "minLINELENGTH:",minLineLength + 1 tempIamge = scr.copy() lines = cv2.HoughLinesP( edges, 1, cv2.cv.CV_PI/180, minLINELENGTH, 0 ) for x1,y1,x2,y2 in lines[0]: cv2.line(tempIamge,(x1,y1),(x2,y2),(0,255,0),1) cv2.imshow(window_name,tempIamge) #临时变量 minLineLength = 20 #全局变量 minLINELENGTH = 20 max_value = 100 window_name = "HoughLines Demo" trackbar_value = "minLineLength" #读入图片,模式为灰度图,创建窗口 scr = cv2.imread("G:\\homework\\building.bmp") gray = cv2.cvtColor(scr,cv2.COLOR_BGR2GRAY) img = cv2.GaussianBlur(gray,(3,3),0) edges = cv2.Canny(img, 50, 150, apertureSize = 3) cv2.namedWindow(window_name) #创建滑动条 cv2.createTrackbar( trackbar_value, window_name, minLineLength, max_value, HoughLinesP) #初始化 HoughLinesP(20) if cv2.waitKey(0) == 27: cv2.destroyAllWindows()
调用:
> import os > os.chdir("g:\homework") > > import HoughLines minLINELENGTH: 20 minLINELENGTH: 21 minLINELENGTH: 22 minLINELENGTH: 23 minLINELENGTH: 25 minLINELENGTH: 26 minLINELENGTH: 27 minLINELENGTH: 28
效果图:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。