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OpenCV 4.5 simple optical flow GPU tutorial cuda::FarnebackOpticalFlow

This OpenCV tutorial is a very simple code example of GPU Cuda optical flow in OpenCV written in c++. The configuration of the project, code, and explanation are included for farneback Optical Flow method. Farneback algorithm is a dense method that is used to process all the pixels in the given image. The dense methods are slower but more accurate as all the pixels of the image are processed. In the following example, I am displaying just a few pixes based on a grid. I am not displaying all the pixes. In the opposite to dense method the sparse method like Lucas Kanade using just a selected subset of pixels. They are faster. Both methods have specific applications. Lucas-Kanade is widely used in tracking. The farneback can be used for the analysis of more complex movement in image scene and furder segmentation based on these changes. As dense methods are slightly slower, the GPU and Cuda implementation can lead to great performance improvements to calculate optical flow for all pixels o
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Easy Opencv 3.1, opencv 2.4.13 instalation Visual Studio 2015 NUGET

Opencv Simple instalation.

Easy Opencv instalation  for Visual Studio 2015 C++ project by NUGET packages. Your opencv is ready to use under 2 minutes after you find the package console.  

From Opencv 3.0 Cmake to Opencv 3.1 prebuild Libs

I wrote about opencv instalation since the release of version 3 and Visual Studio 2015.. In early build of opencv 3.0 there is no precompiled library for VS2015 and I wrote about instalation using CMAKE here . This is still usefull when you need non standard capabilities. You can manage build process and target specific functions and properties. Opencv version 3.1 was shipped with prebuild libs for Visual studio 2015 and everithing is much more simple.. Instation and basic setup is discussed in tutorial here .


Install Opencv, Visual studio 2015 with NUGET

The most simple way without setting the global enviromental variables and staff like location of headers and libs is use the NUGET packages.. 

You can install in nuget package console.. DONT be afraid of CONSOLE. PLEASE. 

1.Open Nuget console 

2. Create empty Visual C++ project

3. Add a source File and write some code.. 

4. Add NUGET package

5. Compile and have a fun.. RLY simple in less than 4 minutes.. 


Again please dont be afraid of console again.. This is much more simple than anaything.. 


Opencv Nuget Console options 

After the PM> you can write commands for Nuger console.. And install Opencv is rly simple. For default configuration like in prebuild libs just use.. 


Opencv Default Build 3.1.0

PM>  Install-Package opencvdefault

Enabled advanced CPU instructions. With OpenMP. No TBB/IPP. vc12/vc14, x64/x86 available.

PM>  Install-Package opencv3.1

AND DONE !!

FOLLOW IMAGES TO CREATE AND INSTALL NUGET IN VS PROJECT


Opencv NUGET console


Opencv install


Opencv 3.1

Opencv Installation NUGET

Opencv Install

opencv 3,1 nuget


opencv 3.1 nuget instal visual studio

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Comments

  1. UnknownSeptember 24, 2016 at 10:01 AM

    thank you so much for shortcut

    ReplyDelete
  2. UnknownDecember 5, 2016 at 5:01 PM

    Vlada, thank you for the work to show this process. I am researching it now. I had been trying to build a complete opencv 3.1.0 library and failed numerous times. I cannot find a complete listing of the necessary dependencies. Even the official opencv installation documentation is incomplete (library version, etc...). Does this NuGet process work the for the complete opencv library: QT, CUDA, CONTRIB, NON-FREE, etc? Unfortunately I almost need the complete library to support my experiments.

    As I side note, can you write up a thread that outlines the exact list of dependencies needed to build a fully functional opencv 3.1.0 library for WIN10-x64? I cannot find it anywhere in the webs. I understand the basic concepts like use of cmake, and building, but if I cant get the right library versions to support, then it makes little difference.

    Thanks in advance, and I look forward to your future work.

    ReplyDelete
    Replies
    1. UnknownDecember 5, 2016 at 5:06 PM

      Forgot to add VTK...

      Delete
    2. VlJanuary 10, 2017 at 11:32 AM

      Last time I did this something like one year ago.. When the prebuild libs for Visual Studio 2015 are not available. You can use standard installation. I have some post. Old one here to build own opencv http://funvision.blogspot.com/2015/11/install-opencv-visual-studio-2015.html
      It is little bit more complicated and unfortunately i haven't got time for that.. Thanks for sharing.. :)

      Delete
  3. UnknownJanuary 3, 2017 at 7:31 PM

    I am also having trouble.
    Some functions work, but VideoCapture does not.
    Searching the included resource folder I do not see a ffmpg dll.
    Do I need to add some features manually?

    ReplyDelete
    Replies
    1. VlJanuary 10, 2017 at 11:36 AM

      I am not sure if you need to install ffmpeg if you are using nuget packages.. I try to let you know. Try to install on your computer ffmpeg. And use nuget. I have maybe already installed.. Thank fo sharing

      Delete
  4. ChrisFebruary 1, 2017 at 11:12 PM

    Hello. Can I also install CUDA using this opencv version? If so, how?

    ReplyDelete
  5. AlexJune 4, 2017 at 7:24 PM

    This was an enormous help to me. Thank you very much!

    ReplyDelete
  6. UnknownDecember 10, 2017 at 1:07 AM

    Thanks for this manual.
    When I add the OpenCV by Nuget package, my Intellisense of visual studio will be deactivated. Have you experienced such this problem?

    ReplyDelete
    Replies
    1. UnknownDecember 10, 2017 at 1:17 AM

      This comment has been removed by the author.

      Delete
    2. UnknownDecember 10, 2017 at 1:18 AM

      Just opencv 2.4 by itseez.
      Opencv3 by itseez does not have this problem.

      Delete
  7. KuteKatApril 6, 2018 at 10:31 PM

    Thank you so much for this tutorial, this helps me quickly start with opencv.
    I am so new with opencv, so I got a problem: when I imread png image, it works fine, but when with .jpg, no luck, it's alway empty. What am I missing ?

    ReplyDelete

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