群星闪耀的博客

import numpy as npimport cv2 as cvfrom matplotlib import pyplot as pltMIN_MATCH_COUNT = 10img1 = cv.imread('box.png',0) # queryImageimg2 = cv.imread('box_in_scene.png',0) # trainImage#...

Brute-Force matcherBFmatcher（Brute-Force Matching）暴力匹配，应用BFMatcher.knnMatch( )函数来进行核心的匹配，knnMatch（k-nearest neighbor classification）k近邻分类算法。kNN算法则是从训练集中找到和新数据最接近的k条记录，然后根据他们的主要分类来决定新数据的类别。该算法涉及3个主要...

我们知道因为一些专利的原因，SIFT和SURF不能再OpenCV后续的版本中继续使用。所以我们可以用OpenCV自带的其他检测器：Oriented FAST and Rotated BRIEF。引用官网的话：This algorithm was brought up by Ethan Rublee, Vincent Rabaud, Kurt Konolige and Gary R. Bradsk...

问题：前面学习的Harris算法检测corners是旋转不变性的。就是说即使这些corners旋转了也可以检测出来。但是假如有的角标放大了之后，在图片中看起来就会变得平滑。比如下面的图片：以前的方法就没用了。为了解决这个问题，所以有的学者就发明了尺度不变的检测方法叫做(Scale-Invariant Feature Transform）SIFT。SIFT算法实现物体识别主要有4...

原理：In last chapter, we saw Harris Corner Detector. Later in 1994, J. Shi and C. Tomasi made a small modification（前一个方法的小改进） to it in their paperGood Features to Trackwhich shows better results com...

Harris Corner Detectiondst=cv.cornerHarris(src, blockSize, ksize, k)img- Input image, it should be grayscale and float32 type.应该输入灰度图像 blockSize- It is the size of neighbourhood considered f...

轮廓检测是基于图像边缘提取的基础，寻找对象轮廓的方法，所以边缘提取的阈值选定会影响最终轮廓的发现相关APIfindContours 发现轮廓drawContours绘制轮廓操作步骤1.转换图像为二值化图像：threshold方法或者canny边缘提取获取的都是二值化图像2.通过二值化图像寻找轮廓：findContours3.描绘轮廓：drawContours相...

Non-maximum SuppressionAfter getting gradient magnitude and direction, a full scan of image is done to remove any unwanted pixels which may not constitute the edge. For this, at every pixel, pixel i...

Structuring ElementWe manually created a structuring elements in the previous examples with help of Numpy. It is rectangular shape. But in some cases, you may need elliptical/circular shaped kernels...

How to find HSV values to track?This is a common question found instackoverflow.com. It is very simple and you can use the same function,cv.cvtColor(). Instead of passing an image, you just pass t...

介绍timeit是python自带的包，用来测试代码的执行时间。使用方式import timeit相关方法 timeit(stmt='pass', setup='pass', timer=<defaulttimer>, number=1000000) 返回： 返回执行stmt这段代码number遍所用的时间，单位为秒，float型 stmt：要...

在显示图像时，经常使用cv.Waitkey（）来进行交互。参考别人的代码，每个人在里面使用的数字都不一样。查找资料后得到了解答，所以做一个记录。1.官网解释def waitKey(delay=None): # real signature unknown; restored from __doc__"""waitKey([, delay]) -> retval. @bri...