Opencv4

从opencv3->opencv4发生改变的一些东西

https://github.com/laganiere/OpenCV3Cookbook

2022-4-20

Chapter 9

opencv3 -> opencv4

cv::xfeatures2d::SIFT -> cv::SIFT

cv_TM_SQDIFF -> cv::TM_SQDIFF

cv_LOAD_IMAGE_GRAYSCALE -> cv::IMREAD_GRAYSCALE

2022-4-22

Chapter 10

In cv::drawMatches change 2 to cv::DrawMatchesFlags::NOT_DRAW_SINGLE_POINTS

这个按道理是完全等价的，不过在vs上会报错

add cv:: namespace for Stitcher

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cv::keyPoint和descriptors之间的关系

The Keypoint is characterized by the 2D position, scale (proportional to the diameter of the neighborhood of the neighborhood that needs to be taken into account), orientation and some other parameters. The keypoint neighborhood is then analyzed by another algorithm that builds a descriptor(usually represented as a feature vector)