改进HoughLines以进行水平线检测(Python,OpenCV) [英] Improve HoughLines for horizontal lines detect (Python, OpenCV)
问题描述
我有这个源图像:
我的目标是删除底线,同时保持字母/数字不变.
My goal is to remove the bottom line while keep the letters/numbers untouched.
这是我使用的代码:
import cv2
import numpy as np
img = cv2.imread('src.png')
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
edges = cv2.Canny(gray,100,200,apertureSize = 5)
minLineLength = 0
maxLineGap = 19
lines = cv2.HoughLinesP(edges,1,np.pi/180,15,minLineLength,maxLineGap)
for x in range(0, len(lines)):
for x1,y1,x2,y2 in lines[x]:
cv2.line(img,(x1,y1),(x2,y2),(255,255,255),2)
cv2.imshow('hough',img)
cv2.waitKey(0)
我到目前为止获得的最佳结果是:
The best result I achieved by now is this:
如何进一步改善它以尽可能清洁图像? 例如,单词下的图像,点和(静止)线周围的所有碎片,我该如何去除它们?
How can I improve it more, to clean the image as much as possible ? For example, all the debris all around the image, points and (still) lines under the words, how can I remove them ?
谢谢.
OT:有没有一种方法可以创建一个跟踪栏来更改参数(apertureSize,minLineLength,maxLineGap等)以实时查看结果?
OT: is there a way to create a trackbar of this which change the parameters (apertureSize, minLineLength, maxLineGap, etc) to see results in real time ?
推荐答案
根据@Link的请求:
As per @Link 's request:
我在python中的经验有限,所以我不知道这段代码的线程安全性如何,但这应该向您展示在python OpenCV中创建跟踪栏的基础.
I have limited experience in python so I don't know how thread safe this code is, but this should show you the basics of creating trackbars in python OpenCV.
def onChange(pos):
global img
global gray
global dst
dst = np.copy(img)
apertureSize = cv2.getTrackbarPos("ApertureSize", "Result")
minLineLength = cv2.getTrackbarPos("LineLength", "Result")
maxLineGap = cv2.getTrackbarPos("LineGap", "Result")
# according to OpenCV, aperture size must be odd and between 3 and 7
if apertureSize % 2 == 0:
apertureSize += 1
if apertureSize < 3:
apertureSize = 3
edges = cv2.Canny(gray,100,200,apertureSize = apertureSize)
lines = cv2.HoughLinesP(edges,1,np.pi/180,15,minLineLength,maxLineGap)
for x in range(0, len(lines)):
for x1,y1,x2,y2 in lines[x]:
cv2.line(dst,(x1,y1),(x2,y2),(255,255,255),2)
#Run Main
if __name__ == "__main__" :
img = cv2.imread("image.png", -1)
dst = np.copy(img)
cv2.namedWindow("Result", cv2.WINDOW_NORMAL)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
#default values for trackbars
defaultApertureSize = 5
minLineLength = 0
maxLineGap = 19
# according to OpenCV, aperture size must be odd and between 3 and 7
# the aperture size range is (0 - 6)
cv2.createTrackbar("ApertureSize", "Result", defaultApertureSize, 6, onChange)
# line length range is (0 - 10)
cv2.createTrackbar("LineLength", "Result", minLineLength, 10, onChange)
# line gap range is (0 - 19)
cv2.createTrackbar("LineGap", "Result", maxLineGap, 19, onChange)
while True:
cv2.imshow("Result", dst)
key = cv2.waitKey(1)
if key == ord('q'):
break
cv2.destroyAllWindows()
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