FUN computer vision opencv C++ tutorials

Farneback Optical flow Opencv simple C++ tutorial and code to achieve optical flow and farneback optical flow of moving an object in opencv video. Lets check the video example and the achieved result on my blog. Working and well describe code is included. 

Optical Flow Farneback parameters remarksYou need 2 images at least to calculate optical flow, the previous image (prevgray) and current image (img).  !! The previous image must be initialized first !!  Both images have to be gray scale. 
Result is computer in flowUmat which has same size as inputs but format is CV_32FC2

0.4- image pyramid or simple image scale
1 is number of pyramid layers. 1 mean that flow is calculated only from previous image.  12 is win size.. Flow is computed over the window larger value is more robust to the noise.  2 mean number of iteration of algorithm 8 is polynomial degree expansion recommended value are 5 - 7 1.2 standard deviation used to smooth used derivatives recommended values from 1.1 - 1,5
calcO…

Research AI and Computer vision There is some demo. Actually it works. I am younger and good thing is that gender is right. Project oxford This is great project from Microsoft research.. The computer vision SDK and API of a state-of-the-art image algorithms. Gender classification optical letter Recognition and many more.

Check all the demos of this great project
Face DetectionFace VerificationEmotion RecognitionFace TrackingMotion DetectionStabilizationSpeech to TextText to SpeechSpeaker IdentificationSpeaker VerificationSpell CheckWord Breaking More information about microsoft computer vision research you can find here research microsoft There are project for images understanding like  microsoft Coco i mentioned in some pervious  articles  (More about Coco). Another projects like Human behavior and video understanding, also 3D modelling and machine learning optimization and many more articles, source code and ideas. The lots of informations are related to Kinect and RGBD. 

Opencv VideoCapture playback, fast frame replay Opencv C++ tutorial how to playback video frames and video loaded into memory, Fast video replay by slider. Simple described and working tutorial working in Visual studio 2015 with simple installation by Nugets Here or also with classical one.. 

This is not something special, but useful. Few days earlier, I post in memory video access by vector<Mat>. Great, fast approach but the short video fills RAM memory and crash the program even if you have 8 GB available. Maybe It is to danger and i decided to cancel this article. 
In this example, i want to access GOPRO HD faster and skipped frames video and in memory is pure fantasy over minute video length. 
Opencv VideoCapture property CV_CAP_PROP_POS_FRAMES
I don't add extra comments. The code is pretty simple. I only highlights the important parts by RED font color. 
This is only important part. By the slider_position value set the CV_CAP_PROP_POS_FRAMES value. cap.set(CV_CAP_PROP_P…