Identifying key video frames

Details Identifying key video frames Identifying key video frames

2004-03-31

2010-11-30

Banks Harold, Marsha D (Department: 2621)

Television

Image signal processing circuitry specific to television

Motion dependent key signal generation or scene change...

C348S699000, C375S240160

Reexamination Certificate

active

07843512

ABSTRACT:
A rate of change of visual content (compared to an adjacent video frame) of a video frame is determined, and the video frame is selected as a key video frame if the rate exceeds a threshold value. In an embodiment, to compute the rate, the motion energy vector magnitude (square of displacement magnitude) of each moved pixel of the current frame is determined, and an average displacement magnitude is determined. The average displacement magnitude may also be used to determine the rate.

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Ajay Divakaran, Ragunathan Radhakrishnan and Kadir Peker, “Motion Activity-Based Extraction of Key frames from video shots”, Journal on Image/Video storage, Retrieval and multimedia: Image and Video Databases, Mitsubishi Electric Research Laboratories, USA, 2002, pp. I-932-I-935.
Frederic Dufuax, “Key Frame selection to represent a video”, Compaq Computer corp., Cambridge Research Lab, 2000, pp. 275-278.

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