OpenCV Python和SIFT功能 [英] OpenCV Python and SIFT features

问题描述

我知道关于 Python 和 OpenCV 的很多问题，但是我没有找到有关此特殊主题的帮助.

I know there is a lot of questions about Python and OpenCV but I didn't find help on this special topic.

我想从python OpenCV中的图像中提取 SIFT关键点.

I want to extract SIFT keypoints from an image in python OpenCV.

我最近安装了OpenCV 2.3，可以访问SURF和MSER，但不能访问SIFT. 在python模块(cv和cv2)中，我看不到任何与SIFT相关的信息(嗯，我在说谎:有2个常量:cv2.SIFT_COMMON_PARAMS_AVERAGE_ANGLE和cv2.SIFT_COMMON_PARAMS_FIRST_ANGLE).

I have recently installed OpenCV 2.3 and can access to SURF and MSER but not SIFT. I can't see anything related to SIFT in python modules (cv and cv2) (well I'm lying a bit: there are 2 constants: cv2.SIFT_COMMON_PARAMS_AVERAGE_ANGLE and cv2.SIFT_COMMON_PARAMS_FIRST_ANGLE).

一段时间以来，这使我感到困惑. 这与OpenCV的某些部分在C中，而其他在C ++中的事实有关吗? 有什么主意吗?

This puzzles me since a while. Is that related to the fact that some parts of OpenCV are in C and other in C++? Any idea?

P.S .:我也尝试了pyopencv(针对OpenCV的<= 2.1的另一种python绑定).

P.S.: I have also tried pyopencv (another python binding for OpenCV <= 2.1) without success.

推荐答案

是否确定允许OpenCV支持SIFT? SIFT是一种专有功能类型，不列颠哥伦比亚大学和该算法的发明者David Lowe在美国获得了专利.在我自己的研究中，我不得不多次重写此算法.实际上，由于SIFT是专有技术，因此一些视觉研究人员试图避免SIFT并使用其他尺度不变模型.

Are you sure OpenCV is allowed to support SIFT? SIFT is a proprietary feature type, patented within the U.S. by the University of British Columbia and by David Lowe, the inventor of the algorithm. In my own research, I have had to re-write this algorithm many times. In fact, some vision researchers try to avoid SIFT and use other scale-invariant models because SIFT is proprietary.

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