Television – Special applications – Film – disc or card scanning
Patent
1994-12-30
1997-11-18
Chin, Tommy P.
Television
Special applications
Film, disc or card scanning
348 97, 348 98, 348451, 348452, H04N 718
Patent
active
056893019
ABSTRACT:
A first pixel of a given field is compared with second and third vertically aligned pixels of corresponding horizontal position of an adjacent field to produce, for each first pixel, a pixel difference signal having a value of zero if the value of the first pixel is intermediate the values of the second and third pixels, the difference signal otherwise having a value equal to the absolute value of a difference between the value of the first pixel and the value of one of the second and third pixels having a value closest to that of first pixel. The pixel difference signals are accumulated over a predetermined portion of one field period of the video signal to provide a field difference signal which is analyzed by a group of five correlators for patterns characteristic of 2-2 pull-down or 3-2 pull-down film mode sources. Flags are produced for identifying film mode operation and for identifying which of the adjacent fields to use in subsequent video processing such as de-interlacing or flicker reduction.
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For the examiner's information, Carlos Correa, a joint inventor of the present application, is also a joint inventor with Rainier Schweer of allowed US application Serial No. 08/052,048 filed Apr. 23, 1993. The Correa et al. application is directed to film mode detection and has been classified in class 348 sub-class 452.
Christopher Todd J.
Correa Carlos
Chin Tommy P.
Emanuel Peter M.
Rao Anand S.
Shedd Robert D.
Thomson Consumer Electronics Inc.
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