The definition of covariance is
Cov(x, y) = E[ (X-E(X)) * (Y-E[Y]) ]
where E is abbreviation of expectation. It is same with Mean.
X = [1 2 3 4 5];
E(X) -> 3 or 3.75
3 is the result of "sum(X)/5"
3.75 is the result of "sum(X)/(5-1)"
In the statistics, mean is divided by N-1 to avoid outlier data affection.
*Example of Covariance
X = [ 2 3 4 2 1 4]
Y = [ 2 4 2 1 6 8]
meanX = sum(X) / 6 -> 2.667
(X - meanX) -> [-0.6667 0.3333 1.3333 -0.6667 -1.6667 1.3333]
(X - meanX) * (X -meanX) -> [ 0.4444 0.1111 1.7778 0.4444 2.7778 1.7778]
cov(x, x) -> sum( ( (X - meanX) * (X -meanX) ) ) / (N-1)
cov of X, Y is like that
-> cov(x,x) cov(x,y)
-> 1.4667 0.5333
in the matlab...
As you can see in the following video, I created a class that stitching n cameras in real time. https://www.youtube.com/user/feelmare/sear...
This is data acquisition source code of LMS511(SICK co.) Source code is made by MFC(vs 2008). The sensor is communicated by TCP/IP. ...
This post is about how to copy Mat data to vector and copy vector data to Mat. Reference this example source code. printf("///////...
Two Image mosaic (paranoma) based on SIFT / C++ source (OpenCV) / SIFT 특징 추출기를 이용한 두장의 영상을 모자익(파라노마) 영상으로 만들기Created Date : 2011.2 Language : C/C++ Tool : Microsoft Visual C++ 2010 Library & Utilized : OpenCV 2.2 Reference : Interent Refer...
Image size of origin is 320*240. Processing time is 30.96 second took. The result of stitching The resul...
(OpenCV Study) Background subtractor MOG, MOG2, GMG example source code (BackgroundSubtractorMOG, BackgroundSubtractorMOG2, BackgroundSubtractorGMG)Background subtractor example souce code. OpenCV support about 3 types subtraction algorithm. Those are MOG, MOG2, GMG algorithms. Det...
make well divided linear coordinate And make pair coordinate Please see code for detail explanation. import numpy as np import cv2 ...
* Introduction - The solution shows panorama image from multi images. The panorama images is processing by real-time stitching algorithm...
OpenCV face detection using adaboost example source code and cpu vs gpu detection speed compare (CascadeClassifier, CascadeClassifier_GPU, detectMultiScale)OpenCV has AdaBoost algorithm function. And gpu version also is provided. For using detection, we prepare the trained xml file. Although...
The MNIST dataset is a dataset of handwritten digits, comprising 60 000 training examples and 10 000 test examples. The dataset can be downl...