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SenseCam v2.3 User Guide Page 1 of 31 10/03/2009

SENSECAM V2.3B USER GUIDE

Steve Hodges

James Srinivasan

Alex Butler

Matthew Lee

Gavin Smyth

James Scott

Alban Rrustemi

Microsoft Research Cambridge

1. Introduction

1.1. Overview of v2 SenseCam

SenseCam is a small digital camera that is designed to take photographs automatically

without user intervention. Unlike a regular digital camera or a cameraphone, it does not

have a view finder or a display that can be used to frame photos. Instead, it is fitted with a

wide-angle (fish-eye) lens that maximises its field-of-view. This in turn means that nearly

everything in front of the camera is captured. In addition to the camera functionality, a

number of different sensors are built into the v2 SenseCam. These include a light intensity

and colour sensor, a passive infrared (body heat) detector, a temperature sensor and a tri-

axis accelerometer. These sensors are monitored by the camera‟s microcontroller, and

changes in sensor readings can be used to automatically trigger the camera shutter. For

example, a significant change in light level, or the detection of body heat in front of the

camera can be used as triggers. Additionally, an internal timer may be used to trigger the

shutter, for example causing an image to be captured automatically every 30 seconds. The

maximum possible rate is an average of around one photo every 5 seconds, i.e. 12 photos

per minute. SenseCam also has a manual trigger button that lets the wearer take pictures in

the more traditional fashion, albeit without the use of a viewfinder.

The VGA resolution images are stored as compressed .JPG files on an internal flash

memory card (currently 1Gbyte cards are fitted). The typical image size (around 30k bytes)

allows for over 30 thousand images to be stored in the camera. In addition to image data, the

memory card is used to store a log file, which records the sensor data each time the sensors

are read (every few seconds). The log file also records the reason for taking each photograph

(e.g. manual shutter press, timed capture or significant change in sensor readings). The log

file is in a comma-separated value format suitable for importing directly into Microsoft

Excel

and many other data manipulation tools. The SenseCam has a built-in real time clock

that ensures the timestamps of all files on the storage card are accurate. Timestamp

information is also recorded in the log file along with each entry.

Note that Excel 2003 has a 32k row limit which can be exceeded by large sensor files.

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Pagina 25 - manual/timer-based photos)

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Microsoft SENSECAM V2.3B Guía de usuario

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