security

Section: Misc. Reference Manual Pages (l)
Index Return to Main Contents

NAME

security - security camera for stopframe and motion detection

SYNTAX

security [-n device]

DESCRIPTION

security is a program that detects motion on a video source and outputs it to a movie file. You can select various movie formats and 3 different image sizes. The frames are added to the movie file as they are collected. This is different than capture(1). Hence, the collection frame rate is less than capture.

When the Stop button is pressed, the movie is rewritten as an optimized movie. This requires copying the movie. If this operation fails (from not enough disk space, for example), the unoptimized movie is left.

The Preferences panel allows the user to adjust the criteria for motion. If a stop-frame camera is desired, deselect 'Use Motion Threshold' and set 'Motion Threshold to -1. This will grab 'End Threshold' frames every and 'Time Threshold' to 15 to collect a single frame every 15 seconds.

The misc selection controls settings for various attributes.

Audio: Collect audio in addition to video.
Monitor: While collecting video, display the frames only the frames that are included in the movie.
Saver: When motion is detected, reset the screensaver. This allows you to walk into you office and have your screen unblank.
Timestamp: Add a date/time stamp to the first frame of every motion sequence.

The algorithm for the motion detection is to difference two frames. The Luminance of the frames is compared on a per-pixel basis against a threshold. Then the sum of all motion-detected pixels is compared to the motion threshold.

OPTIONS

-n device: This option specifies the device number. A default of 0 is used if not specified. This option is only needed if there are more than one video input device ( i.e. vino and Indy Video).

AUTHOR

Silicon Graphics Inc.

BUGS

If the program is aborted before the movie is optimized, the movie is useless. This should only happen if the program is killed. It will properly deal with disk full problems. Sometimes the Movie View will crash.

This document was created by man2html, using the manual pages.
Time: 13:10:06 GMT, December 07, 2024