我在图像中有一个简单的网格,我正在尝试确定网格大小,例如6x6、12x12 等。使用 Python 和 cv2。
我正在用上面的 3x3 网格对其进行测试,我计划通过检测图像中有多少垂直/水平线来确定网格大小:
import cv2
import numpy as np
im = cv2.imread('photo2.JPG')
gray = cv2.cvtColor(im,cv2.COLOR_BGR2GRAY)
imgSplit = cv2.split(im)
flag,b = cv2.threshold(imgSplit[2],0,255,cv2.THRESH_OTSU)
element = cv2.getStructuringElement(cv2.MORPH_CROSS,(1,1))
cv2.erode(b,element)
edges = cv2.Canny(b,150,200,3,5)
while(True):
img = im.copy()
lines = cv2.HoughLinesP(edges,1,np.pi/2,2, minLineLength = 620, maxLineGap = 100)[0]
for x1,y1,x2,y2 in lines:
cv2.line(img,(x1,y1),(x2,y2),(0,255,0),1)
cv2.imshow('houghlines',img)
if k == 27:
break
cv2.destroyAllWindows()
我的代码检测到线条,如下所示,但是我的图像中的每条线都检测到多条线:
(图中每条线都有两条1px的绿线)
我不能简单地将线数除以二,因为(取决于网格大小)有时只会绘制一条线。
如何更准确地检测原始图像中检测到的每条线并绘制一条线?
我调整了阈值设置,将图像缩小为黑白,但我仍然看到多条线。我认为这是因为精明的边缘检测?
最佳答案
我最终遍历了这些线并删除了彼此相距 10 像素以内的线:
lines = cv2.HoughLinesP(edges,1,np.pi/180,275, minLineLength = 600, maxLineGap = 100)[0].tolist()
for x1,y1,x2,y2 in lines:
for index, (x3,y3,x4,y4) in enumerate(lines):
if y1==y2 and y3==y4: # Horizontal Lines
diff = abs(y1-y3)
elif x1==x2 and x3==x4: # Vertical Lines
diff = abs(x1-x3)
else:
diff = 0
if diff < 10 and diff is not 0:
del lines[index]
gridsize = (len(lines) - 2) / 2
关于Python cv2 HoughLines网格线检测,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19054055/