Television – Image signal processing circuitry specific to television – Motion vector generation
Patent
1994-11-22
1997-04-01
Chin, Tommy P.
Television
Image signal processing circuitry specific to television
Motion vector generation
348416, 348700, H04N 732
Patent
active
056171498
ABSTRACT:
An apparatus and a method for detecting scene change using difference of MAD(Mean Absolute Difference), so called dMAD wherein the method for detecting scene change using difference of mean absolute difference(dMAD) between image frames by use of scene change detecting apparatus comprising frame memory, first absolute calculator, accumulator, multiplicator, first latch circuit, second absolute calculator, first comparator, second comparator, selector and second latch circuit, the method comprising the steps of: (A) calculating MAD of the `n`th input image frame and checking whether scene change judgement variable, which is used for current frame according to scene change of previous frame, is `1`; (B) judging scene change only using MAD since current frame corresponds to the second frame of new scene when scene change variable is `1` at said step (a); (C) judging scene change using dMAD as scene change variable when scene change variable is not `1` at said step (a); (D) saving scene change state and MAD of the `n`th frame so as to use them for the processing of the `n+1`th frame.
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Document AVC-275, "Scene Change Handling in Low Delay Mode", Jul. 1992, pp. 1-11.
Kim Yong H.
Lee Hyun J.
Lee Sang M.
Chin Tommy P.
Electronics and Telecommunications Research Institute
Korea Telecommunication Authority
Le Vu
LandOfFree
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