Documentation for Video/CameraMotion

Technique CameraMotionType
Document MPEG-7 Visual (ISO/IEC 15938-3)
Name Benoit Mory, Philips Recherche France
EMail benoit.mory@philips.com
Type Descriptor
External Libraries N/A
Related Ds/DSs MotionActivity, MotionTrajectory
Used Ds/DSs None
Input Mpeg video stream segments (e.g. foo.mpg[1,1000,25],320,240). The file name of the mpeg video stream is followed
by the segment start frame, the segment end frame, the frame rate (in square brackets), followed by the width
and the height of video frames as shown in the example.
Extraction Yes
Client Appl Search & Retrieval
Summary This descriptor characterizes qualitatively and quantitatively camera motion parameters along time (typically along a video segment).
It is based on 3-D camera motion parameter information, which can be automatically extracted or generated by
capture devices.The descriptor supports any combination of the following well-known basic camera operations :
fixed, panning, tracking, tilting, booming, zooming, dollying, and rolling.
Strong Points As a discriminant feature (motion) of video streams, the camera motion is typically useful in low-level feature-based
retrieval, combined with spatial descriptors such as colour, texture or shape. Could also be used in professional applications.
Limitations The extraction method implemented in the XM does not allow to discriminate between pans and tracks (rotations and translations)
when the visual field is small (same motion vector fields).
Known Problems None
Parameters None?