Image analysis – Image compression or coding – Quantization
Patent
1994-11-16
1999-06-01
Couso, Jose L.
Image analysis
Image compression or coding
Quantization
382270, 327 75, 358465, G06K 940, H04N 140
Patent
active
059095121
ABSTRACT:
An image processor includes a quantizing unit which quantizes input image data to data of at least three or more levels. A memory stores the quantized data on a picture unit basis, and an output unit outputs the stored image on the picture unit basis. The quantizing unit quantizes the image data of a present picture in accordance with the quantized data of a previous picture stored in the memory, and quantizes the input image data of one pixel to the data of three or more levels by using a plurality of threshold values each including an upper threshold value, a standard threshold value and a lower threshold value.
REFERENCES:
patent: 3562420 (1971-02-01), Thompson
patent: 3959583 (1976-05-01), Judice et al.
patent: 3997719 (1976-12-01), Judice
patent: 4531160 (1985-07-01), Ehn
patent: 5122783 (1992-06-01), Bassetti, Jr.
patent: 5272469 (1993-12-01), Memarzadeh
"Digital Video: A Buffer-Controlled Dither Processor For Animated Images", C. Judice, IEEE Transactions On Communications, vol. Com-25, No. 11, Nov. 1977, NY, USA, pp. 1433-1440.
Aratani Shuntaro
Makita Takeshi
Ohshima Masamichi
Suga Kazumi
Bella Matthew C.
Canon Kabushiki Kaisha
Couso Jose L.
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