Release 1.0.7 with GPGPU support available
Version 1.0.7 of the Scene application binaries and source code are available for download. This release features GPU accelerated post processing of the object blobs using morphological dilation and erosion filters. The Scene GUI incorporates two new sliders that set the number of dilations and erosions performed during post processing (dilations are always done before erosions). Morphological filtering can improve the tracking robustness in many common scenarios.
Scene 1.0.7 offers GPU implementations of all the background subtraction methods using OpenCL. When an OpenCL compatible device is detected the GPU versions are used by default, otherwise Scene falls back on the CPU versions (although see the XML configuration below). The release includes 32 bit and 64 bit Windows binaries with Visual Studio 2010 projects. Also available are 32 bit and 64 bit binaries for Linux, tested on Ubuntu 12.04 LTS with NVIDIA graphics cards. Depending on the computer hardware resources, the image resolution, and the background model employed, the GPU implementations can show a very significant increase in performance compared to the CPU versions, both in the 32 bit and 64 bit releases.
In addition, Scene 1.0.7 allows sending messages to multiple TUIO clients. Please see the XML Configuration File section below.
Thanks for the feedback from the people who are using Scene!
Scene is an open source multiplatform computer vision framework that performs background subtraction and object tracking using algorithms based on neural networks and fuzzy classification rules. It was mainly designed as a toolkit for the rapid development of interactive art projects that explore dynamics of complex environments (for example public spaces).
This framework is developed by Laurence Bender, Ignacio Guerra and Juan Cruz Amusategui at the Laboratorio de Arte Electrónico e Inteligencia Artificial of the Universidad Nacional de Tres de Febrero in Caseros, province of Buenos Aires, Argentina, as part of the Electronic Arts research program.
The Scene GUI is a standalone application with a simple user interface which implements the widespread TUIO protocol, originally designed by the reacTIVision project for transmitting the state of tangible objects and multi-touch events on a table surface.
For each detected foreground object, Scene sends a TUIO cursor message and a TUIO blob message to the client application. The cursor message carries the center of mass position, velocity and acceleration values. The blob message carries the bounding box position, size, velocity and acceleration values, and the area of the blob. Each blob is assigned a unique session ID, which allows the simultaneous identification and tracking of several objects.
The framework includes a set of client projects
for several programming languages, which serve as a starting point for
the development of interactive applications. They are basically extensions of the TUIO 1.0 clients that also handle TUIO blobs, and include a SceneBlob class that simplifies object tracking and analysis. Example clients
are available for the languages Java and Processing, see the downloads section. Existing TUIO clients may also be used with Scene.
Before starting the Scene application make sure you have a supported camera connected to your system, or an existing video defined in the XML Configuration file (in the Windows version). When running, the application GUI shows three video windows: the source image, the background model image, and a binary image with the tracked object blobs.
A group of option buttons below the source video window indicate whether to draw the center of mass position, the blob bounding box, and the blob session ID in the source and tracking video windows. Below the tracking video window there are two sliders that adjust the minimum and maximum areas of the extracted blobs, relative to the video image size. Two other sliders set the number of dilations and erosions performed on the blobs during post processing.
Under Windows, the Source menu allows the user to select a connected camera or a video file as the image input for Scene. When a camera is selected in the Windows version, the item 'Camera Options' is enabled. Choosing this option, or pressing 'Ctrl-O', shows a system dialog that allows the adjustment of the available camera parameters. Under Linux, only camera capture is supported and the overall camera settings are configured within the Scene.xml configuration file (see below).
The Model menu allows the user to select one of the five available background
subtraction algorithms implemented in Scene. Pressing 'Ctrl-T' selects the training
option, which sets the background model to the current
source image. When a background subtraction method is selected, a group of sliders that allow the configuration of its parameters appear in the lower right quadrant of the GUI. A more detailed description of the methods and their parameters can be found in the BGS Methods section.
XML Configuration File
Common settings can be edited within the file "Scene.xml".
The <camera width="320" height="240" /> XML tag sets the image size of the captured video when using a camera as the input source.
Since Scene 1.0.2, the application allows video files as input sources under Windows. The XML tag <video file="myvideo.avi" /> defines the path to the file. In order to correctly reproduce videos, the necessary codecs must be previously installed in the system.
In the Linux version of Scene the <video /> tag is not used, since only camera capture is supported. An additional <camsettings /> XML tag allows the configuration of the overall camera settings.
The Scene application usually sends the TUIO messages
to port 3333 on localhost (127.0.0.1). You can change this setting
by editing the XML tag <tuio host="127.0.0.1" port="3333" />.
The <stream /> XML tag contains the image streaming parameters. The image attribute can be set to "source", "tracking" or "background". The width and height attributes define the size of the streamed images, while the quality attribute sets the jpeg compression quality of the individual frames (0-100). For example, the following enables streaming of the source image to localhost on port 9100:
<stream enable="1" image="source" host="127.0.0.1" port="9100" width="320" height="240" quality="60" />
New to Scene 1.0.5 or greater is the <gpu /> XML tag, that sets GPU processing by default. When the "enabled" attribute is set to 0, only the CPU implementations of the background subtraction methods are used.
The remaining XML tags store program parameters that are set
in the Scene GUI. These tags are usually not edited by the user and
are automatically updated when closing the application or changing the
The source distribution includes projects for Linux and Windows platforms, and their respective build systems.
To the reacTIVision project for inspiration, great code, and help with the speech.
To the wxWidgets project for making multiplatform GUI development a breeze.
To the CCV project for their graphic interface design.
To the Independent JPEG Group for their solid image compression library.
This program is free software; you can redistribute it and/or modify
This program is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License