Technique | CameraMotionType |
---|---|
Document | MPEG-7 Visual (ISO/IEC 15938-3) |
Name | Benoit Mory, Philips Recherche France |
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? |