如何使用opencv从图中删除另一个对象? [英] How to delete the other object from figure by using opencv?
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问题描述
我试图检测下图中的黄线,但徽标(黄色)也会被标记.我的问题是如何屏蔽徽标?
I tried to detect the yellow lines in the following picture but the logo(yellow color) will be marked as well. My question is that how to mask the logo?
我使用霍夫变换的标准代码.我的代码如下:
I use the standard code of the Hough Transform. My code is as follows:
import cv2
import numpy as np
img = cv2.imread('Road3.jpg')
hsv = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
low_yellow=np.array([18, 94, 140])
up_yellow=np.array([48, 255, 255])
mask=cv2.inRange(hsv, low_yellow, up_yellow)
edges = cv2.Canny(mask,75,150)
lines = cv2.HoughLinesP(edges,1,np.pi/180,50,maxLineGap=250)
for line in lines:
x1,y1,x2,y2 = line[0]
cv2.line(img,(x1,y1),(x2,y2),(0,255,0),5)
cv2.imshow('image', img)
cv2.imshow("edges", edges)
k = cv2.waitKey(0)
cv2.destroyAllWindows()
推荐答案
您可以使用多尺度模板匹配方法.
You can use multi-scale template matching approach.
您要删除以下图片:
- 检测图像
import cv2
import imutils
import numpy as np
template = cv2.imread("template/template.jpg")
template = cv2.cvtColor(template, cv2.COLOR_BGR2GRAY)
template = cv2.Canny(template, 50, 200)
(h, w) = template.shape[:2]
image = cv2.imread('nnEGw.jpg')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
found = None
for scale in np.linspace(0.2, 1.0, 20)[::-1]:
resized = imutils.resize(gray, width=int(gray.shape[1] * scale))
r = gray.shape[1] / float(resized.shape[1])
if resized.shape[0] < h or resized.shape[1] < w:
break
edged = cv2.Canny(resized, 50, 200)
result = cv2.matchTemplate(edged, template, cv2.TM_CCOEFF)
(_, maxVal, _, maxLoc) = cv2.minMaxLoc(result)
if found is None or maxVal > found[0]:
found = (maxVal, maxLoc, r)
(_, maxLoc, r) = found
(startX, startY) = (int(maxLoc[0] * r), int(maxLoc[1] * r))
(endX, endY) = (int((maxLoc[0] + w) * r), int((maxLoc[1] + h) * r))
cv2.rectangle(image, (startX, startY), (endX, endY), (0, 0, 255), 2)
cv2.imwrite("result/edges2.png", image)
- 填充矩形
cv2.rectangle(image, (startX, startY), (endX, endY), (255, 255, 255), -1)
- 应用霍夫变换
hsv = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)
low_yellow = np.array([18, 94, 140])
up_yellow = np.array([48, 255, 255])
mask = cv2.inRange(hsv, low_yellow, up_yellow)
edges = cv2.Canny(mask, 75, 150)
lines = cv2.HoughLinesP(edges, 1, np.pi / 180, 50, maxLineGap=250)
for line in lines:
x1, y1, x2, y2 = line[0]
cv2.line(image, (x1, y1), (x2, y2), (0, 255, 0), 5)
# cv2.imshow('image', img)
cv2.imwrite("result/edges3.png", edges)
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