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 post is about how to copy Mat data to vector and copy vector data to Mat. Reference this example source code. printf("///////...
Image size of origin is 320*240. Processing time is 30.96 second took. The result of stitching The resul...
* Introduction - The solution shows panorama image from multi images. The panorama images is processing by real-time stitching algorithm...
In past, I wrote an articel about YUV 444, 422, 411 introduction and yuv <-> rgb converting example code. refer to this page -> ht...
OpenCV Drawing Example, (line, circle, rectangle, ellipse, polyline, fillConvexPoly, putText, drawContours)line, circle, rectangle, ellipse, polyline, fillConvexPoly, putText, drawContours example source code!!. ... //http://study....
Example source code of extract HOG feature from images, save descriptor values to xml file, using opencv (using HOGDescriptor )This example source code is to extract HOG feature from images. And save descriptors to XML file. The source code explain how to use HOGD...
fig 1. Left: set 4 points (Left Top, Right Top, Right Bottom, Left Bottom), right:warped image to (0,0) (300,0), (300,300), (0,300) Fi...
This is example for background subtraction on opencv 3.2 version previously, I post 2.7 version example on here. http://study.marearts.co...
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. ...