opencv - 缺少必需的参数 'outImage'(位置 3)

Question

我是 opencv 和 python 的新手。我尝试使用示例代码来提取图像的特征，但出现此错误:

TypeError: drawKeypoints() missing required argument 'outImage' (pos 3)

我的代码是这样的

import numpy as np
import cv2
from matplotlib import pyplot as plt
img = cv2.imread('1.png',0)

fast = cv2.FastFeatureDetector_create()

kp = fast.detect(img,None)
img2 = cv2.drawKeypoints(img, kp, color=(255,0,0))

print ("Threshold: ", fast.getInt('threshold'))
print ("nonmaxSuppression: ", fast.getBool('nonmaxSuppression'))
print ("neighborhood: ", fast.getInt('type'))
print ("Total Keypoints with nonmaxSuppression: ", len(kp))
cv2.imwrite('fast_true.png',img2)

fast.setBool('nonmaxSuppression',0)
kp = fast.detect(img,None)
print ("Total Keypoints without nonmaxSuppression: ", len(kp))
img3 = cv2.drawKeypoints(img, kp, color=(255,0,0))
cv2.imwrite('fast_false.png',img3)

想要查看图像的提取特征。

关于如何提取图像特征以与网络摄像头图像进行比较的任何建议都会有所帮助。

谢谢。

Answer 1

这似乎是 drawKeypoints() 函数中的错误。可以分配 outImage = None 来解决它:

img2 = cv2.drawKeypoints(img, kp, outImage = None, color=(255,0,0))

或创建 img2 并将其修改为:

img2 = cv2.merge([img, img, img])
cv2.drawKeypoints(img, kp, outImage = img2, color = (255, 0, 0), 
                    flags = cv2.DRAW_MATCHES_FLAGS_DRAW_OVER_OUTIMG)