.. _required-hardware:

Required hardware for recording
================================

Two personal computers, a camera unit and forehead/chin-rest are necessary to use SimpleGazeTracker.

**Personal computer for recording**
    This PC must have an appropriate interface to connect the camera unit (e.g. USB2.0) and a wired network interface.

**Personal computer for presentation**
    This PC must have a wired network interface.  Use of a decent graphics card is recommended for precise stimulus presentation.

**Camera unit**
    See below for supported cameras. If the camera unit does not have integrated lighting, an infrared lighting unit is alos necessary.

**Forehead/chin-rest**
    Current version of SimpleGazeTracker does not support head motion correction. It is necessary to restrict participant's head motion with a head/chin-rest.

.. note::
    If your PC is powerful enough, you can install both GazeParser and SimpleGazeTracker on a single PC.
    See :ref:`singlepc-recording` for detail.

Supported camera
=================

Currently, there are three editions of SimpleGazeTracker.

**OpenCV edition (Windows/Linux)**
    This edition uses OpenCV to control camera unit.  Supported cameras depend on OpenCV.

**OptiTrack edition (Windows)**
    This edition supports OptiTrack `V100R2 <http://www.naturalpoint.com/optitrack/products/v100-r2/>`_ and `V120Slim <http://www.naturalpoint.com/optitrack/products/v120-slim/>`_ (NaturalPoint, Inc.).
    These cameras have USB2.0 interface and can capture images at 100 - 120 frames per second. See *Cameras used for development*.

**CameraLink edition (Windows)**
    This edition currently supports CameraLink image grabbers manufactured by `Interface Corporation <http://www.interface.co.jp/>`_.
    Capturing frame rate depends on the specification of the connected camera.

.. figure:: cam_pex530421.jpg

**Flycapture2 edition (Windows/Linux)**
    This edition supports Point Grey Flea3 (USB3.0) cameras.
    See *Cameras used for development*.

**DirectShow edition (Windows)**
    This edition supports DirectShow cameras.