US 7,321,401 B2
Contour emphasizing circuit
Toru Aida, Kanagawa (Japan); Seiji Matsunaga, Kanagawa (Japan); and Junichi Onodera, Kanagawa (Japan)
Assigned to Fujitsu General Limited, Kawasaki-shi (Japan)
Filed on Feb. 22, 2005, as Appl. No. 11/63,238.
Application 11/063238 is a continuation in part of application No. 09/463642, filed on Jan. 24, 2000, abandoned.
Prior Publication US 2005/0190301 A1, Sep. 01, 2005
Int. Cl. H04N 5/21 (2006.01)
U.S. Cl. 348—625  [348/630] 5 Claims
OG exemplary drawing
 
1. A contour emphasizing circuit comprising:
a contour pick-up for sampling a contour component from an input video signal;
a level judging unit comprising a decoder for discriminating the luminance level of the input video signal from n number of luminance levels based on upper m-bit data of the luminance levels, n being equal to 2(m−1);
a coefficient control unit for selectively choosing a coefficient from n number of coefficients based on the judging unit so that a high-value coefficient is selected for a high luminance level and a low value coefficient is selected for a low luminance level, multiplying the chosen coefficient by the sampled contour component to obtain a product and outputting the product; and
an adder for adding the product to the input video signal and outputting a contour emphasized video signal, wherein coefficient values are either equal to zero or fall within a range that is less than ½x but greater than or equal to ½(x+1), x being an integer ranging from 0 to n.