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• Revision 1fc70e47cd : Adds code for corner detection and ransac This code is to start experiments wit

  7 février 2015, par Deb Mukherjee

  Changed Paths :
   Add /vp9/encoder/vp9_corner_detect.c

  
   Add /vp9/encoder/vp9_corner_detect.h

  
   Add /vp9/encoder/vp9_corner_match.c

  
   Add /vp9/encoder/vp9_corner_match.h

  
   Add /vp9/encoder/vp9_global_motion.c

  
   Add /vp9/encoder/vp9_global_motion.h

  
   Add /vp9/encoder/vp9_ransac.c

  
   Add /vp9/encoder/vp9_ransac.h

  
   Modify /vp9/vp9cx.mk

  
  
  Adds code for corner detection and ransac

  This code is to start experiments with global motion models.

  The corner detection can be either fast_9 or Harris.
  Corner matching is currently based on normalized correlation.
  Three flavors of ransac are used to estimate either a
  homography (8-param), or an affine model (6-param) or a
  rotation-zoom only affine model (4-param).

  The highest level API for the library is in vp9_global_motion.h,
  where there are two functions - one for computing a single model
  and another for computing multiple models up to a maximum number
  provided or until a desired inlier probability is achieved.

  Change-Id : I3f9788ec2dc0635cbc65f5c66c6ea8853cfcf2dd

• CMake on Ubuntu, Requested 'libavdevice' >= 56.4.100 but version of libavdevice is 53.2.0

  5 mars 2019, par user1830386

  I am trying to get into plug in writing for Gazebo but keep running into an error when compiling my programs.

  Requested 'libavdevice >= 56.4.100' but version of libavdevice is 53.2.0
  
  CMake Error at /usr/share/cmake- 
  
  3.10/Modules/FindPackageHandleStandardArgs.cmake:137 (message):
  
  Could NOT find AVDEVICE (missing: AVDEVICE_FOUND) (Required is at least
  
  version "56.4.100")

  but when I do ffmpeg -version I get :

   libavdevice    57. 10.100 / 57. 10.100

  Yet CMake seems to think I’m on version 53. Trying to update ffmpeg or libavdevice-dev returns that I am on the latest version.

  Here is my make file :

  cmake_minimum_required(VERSION 2.8 FATAL_ERROR)
  
  
  
  find_package(gazebo REQUIRED)
  
  include_directories(${GAZEBO_INCLUDE_DIRS})
  
  link_directories(${GAZEBO_LIBRARY_DIRS})
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")
  
  
  
  add_library(model_control SHARED model_control.cc)
  
  target_link_libraries(model_control ${GAZEBO_LIBRARIES})
  
  
  
  list(APPEND CMAKE_CXX_FLAGS "${GAZEBO_CXX_FLAGS}")

  and the cc file :

  #include <functional>
  
  #include <gazebo></gazebo>gazebo.hh>
  
  #include <gazebo></gazebo>physics/physics.hh>
  
  #include <gazebo></gazebo>common/common.hh>
  
  #include <ignition></ignition>math/Vector3.hh>
  
  
  
  namespace gazebo
  
  {
  
    class ModelPush : public ModelPlugin
  
    {
  
      public: void Load(physics::ModelPtr _parent, sdf::ElementPtr /*_sdf*/)
  
      {
  
        // Store the pointer to the model
  
        this->model = _parent;
  
  
  
        // Listen to the update event. This event is broadcast every
  
        // simulation iteration.
  
        this->updateConnection = event::Events::ConnectWorldUpdateBegin(
  
            std::bind(&amp;ModelPush::OnUpdate, this));
  
      }
  
  
  
      // Called by the world update start event
  
      public: void OnUpdate()
  
      {
  
        // Apply a small linear velocity to the model.
  
        this->model->SetLinearVel(ignition::math::Vector3d(.3, 0, 0));
  
      }
  
  
  
      // Pointer to the model
  
      private: physics::ModelPtr model;
  
  
  
      // Pointer to the update event connection
  
      private: event::ConnectionPtr updateConnection;
  
    };
  
  
  
    // Register this plugin with the simulator
  
    GZ_REGISTER_MODEL_PLUGIN(ModelPush)
  
  }
  
  </functional>

  Thanks !

• PSNR for YUV files using matlab [duplicate]

  29 février 2016, par apiproj

  This question already has an answer here :

  • Power Signal Noise Ratio (PSNR) of colored jpeg image [closed]
    
    2 answers
    

  In my video streaming application I have two yuv files.One is original which is am streaming over the network after x264 encoding, another is reconstructed decoded yuv file in receiver side.

  How to calculate PSNR value between two YUV files in MATLAB or ldecoder or using any other tool ?

  Thanks in advance.