[英]Python opencv 3 SIFT feature extraction
I want to change the following two commands which are written in opencv 2.3 . 我想更改以下两个在opencv 2.3中编写的命令。
fea_det=cv2.FeatureDetector_create("SIFT")
des_ext=cv2.DescriptorExtractor_create("SIFT")
In opencv 3, I know that there is a command which create SIFT, so 在opencv 3中,我知道有一个创建SIFT的命令,因此
fea_det=cv2.xfeatures2d.SIFT_create()
But what should I use for des_ext ? 但是我应该对des_ext使用什么? I am asking that what is the equivalent code of "
cv2.DescriptorExtractor_create("SIFT")
" in opencv 3? 我在问opencv 3中“
cv2.DescriptorExtractor_create("SIFT")
“的等效代码是什么?
FeatureDetector_create and DescriptorExtractor_create since OpenCV 3 were moved to xfeatures2d subdirectory. 从OpenCV 3开始,FeatureDetector_create和DescriptorExtractor_create已移动到xfeatures2d子目录。
>>> sift = cv2.xfeatures2d.SIFT_create()
>>> (kps, descs) = sift.detectAndCompute(gray, None)
>>> print("# kps: {}, descriptors: {}".format(len(kps), descs.shape))
# kps: 274, descriptors: (274, 128)
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