Python 如何使用opencv识别和标记形状
我试图使用opencv创建一个围绕圆锥体的矩形。我目前所处的位置是,我已经概述了生成三角形形状的代码。如何使用opencv围绕三角形创建矩形 到目前为止,我的代码是:Python 如何使用opencv识别和标记形状,python,numpy,opencv,image-processing,Python,Numpy,Opencv,Image Processing,我试图使用opencv创建一个围绕圆锥体的矩形。我目前所处的位置是,我已经概述了生成三角形形状的代码。如何使用opencv围绕三角形创建矩形 到目前为止,我的代码是: import cv2 import numpy as np img = cv2.imread('image.jpg') ret, mask = cv2.threshold(img[:, :,2], 235, 255, cv2.THRESH_BINARY) mask3 = np.zeros_like(img) mask3[:,
import cv2
import numpy as np
img = cv2.imread('image.jpg')
ret, mask = cv2.threshold(img[:, :,2], 235, 255, cv2.THRESH_BINARY)
mask3 = np.zeros_like(img)
mask3[:, :, 0] = mask
mask3[:, :, 1] = mask
mask3[:, :, 2] = mask
orange = cv2.bitwise_and(img, mask3)
cv2.imwrite("output.jpg", orange)
im = cv2.imread('output.jpg')
imgray = cv2.cvtColor(im, cv2.COLOR_BGR2GRAY)
ret, thresh = cv2.threshold(imgray, 127, 255, 0)
contours, hierarchy = cv2.findContours(thresh, cv2.RETR_TREE, cv2.CHAIN_APPROX_SIMPLE)
cv2.drawContours(im, contours, -1, (0,255,0), 3)
cv2.imshow('img',im)
cv2.waitKey(0)
cv2.destroyAllWindows
Jpeg文件:
一种方法是使用多尺度模板匹配
- 裁剪要查找的对象:
- 应用Canny边缘检测来发现边缘
- 使用
matchTemplate
将numpy导入为np
导入imutils
导入glob
进口cv2
template=cv2.imread(“template.jpg”)
模板=cv2.CVT颜色(模板,cv2.COLOR\u BGR2GRAY)
模板=cv2.Canny(模板,50200)
(h,w)=模板形状[:2]
对于glob.glob(“img2”+“/pXobJ.jpg”)中的imagePath:
image=cv2.imread(imagePath)
灰色=cv2.CVT颜色(图像,cv2.COLOR\u BGR2GRAY)
找到=无
对于np.linspace(0.2,1.0,20)[:-1]中的比例:
resized=imutils.resize(灰色,宽度=int(灰色.shape[1]*比例))
r=gray.shape[1]/浮动(已调整大小的.shape[1])
如果调整了.shape[0]found[0]:
找到=(maxVal、maxLoc、r)
(u,maxLoc,r)=找到
(startX,startY)=(int(maxLoc[0]*r),int(maxLoc[1]*r))
(endX,endY)=(int((maxLoc[0]+w)*r),int((maxLoc[1]+h)*r))
cv2.矩形(图像,(startX,startY),(endX,endY),(0,0,255),2)
cv2.imwrite(“img2/out.jpg”,图片)
打印(“表格坐标:({},{},{},{},{})”。格式(startX,startY,endX,endY))
- 您还可以通过经过训练的网络使用深度学习对象检测
edged = cv2.Canny(resized, 50, 200)
result = cv2.matchTemplate(edged, template, cv2.TM_CCOEFF)
import numpy as np
import imutils
import glob
import cv2
template = cv2.imread("template.jpg")
template = cv2.cvtColor(template, cv2.COLOR_BGR2GRAY)
template = cv2.Canny(template, 50, 200)
(h, w) = template.shape[:2]
for imagePath in glob.glob("img2" + "/pXobJ.jpg"):
image = cv2.imread(imagePath)
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("img2/out.jpg", image)
print("Table coordinates: ({}, {}, {}, {})".format(startX, startY, endX, endY))