Book Image

Cinder Creative Coding Cookbook

Book Image

Cinder Creative Coding Cookbook

Overview of this book

Cinder is one of the most exciting frameworks available for creative coding. It is developed in C++ for increased performance and allows for the fast creation of visually complex, interactive applications."Cinder Creative Coding Cookbook" will show you how to develop interactive and visually dynamic applications using simple-to-follow recipes.You will learn how to use multimedia content, draw generative graphics in 2D and 3D, and animate them in compelling ways. Beginning with creating simple projects with Cinder, you will use multimedia, create animations, and interact with the user.From animation with particles to using video, audio, and images, the reader will gain a broad knowledge of creating applications using Cinder.With recipes that include drawing in 3D, image processing, and sensing and tracking in real-time from camera input, the book will teach you how to develop interesting applications."Cinder Creative Coding Cookbook" will give you the necessary knowledge to start creating projects with Cinder that use animations and advanced visuals.
Table of Contents (19 chapters)
Cinder Creative Coding Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Tracking motion using optical flow


In this recipe we will learn how to track motion in the images produced from a webcam using OpenCV using the popular Lucas Kanade optical flow algorithm.

Getting ready

We will need to use OpenCV in this recipe, so please refer to the Integrating with OpenCV recipe from Chapter 3, Using Image Processing Techniques and add OpenCV and it's CinderBlock to your project. Include the following files to your source file:

#include "cinder/Capture.h"
#include "cinder/gl/Texture.h"
#include "CinderOpenCV.h"

Add the following using statements:

using namespace ci;
using namespace ci::app;
using namespace std;

How to do it…

We will read frames from the camera and track motion.

  1. Declare the ci::gl::Texture and ci::Capture objects to display and capture from a camera. Also, declare a cv::Mat object as the previous frame, two std::vector<cv::Point2f> objects to store the current and previous features, and a std::vector<uint8_t> object to store the status of each feature...