Method and apparatus for supplying data

Details Method and apparatus for supplying data Method and apparatus for supplying data

1997-04-23

1998-04-28

Au, Amelia

Television

Image signal processing circuitry specific to television

Motion dependent key signal generation or scene change...

H04N 732

Patent

active

057451907

ABSTRACT:
In order to supply data in which scene switching in a motion picture can be easily detected, pixel data 50 of a motion picture is input and stored in the frame buffer 18 as pixel values 52, and the statistical processor 14 operates the mean value .mu. and standard deviation .alpha. of luminous values using all pixel data 50 of one frame. The conversion table processor 16 sets a pixel conversion table expressing the correspondence between pixel values 52 and normalized output pixel values 54 using the mean value .mu. and standard deviation .alpha., reads pixel values 54 sequentially, and outputs output pixel values 54 for one frame to the detector 12 using the pixel conversion table. The detector 12 obtains differential values between previous output pixel values 54 and current output pixel values 54, judges that the number of pixels exceeding the threshold value, Vth, corresponds to a frame where a scene is switched, and outputs the scene change detection signal 56.

REFERENCES:
patent: 5032905 (1991-07-01), Koga
patent: 5065446 (1991-11-01), Suzuki et al.
patent: 5404174 (1995-04-01), Sugahara

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