[54] SYSTEM FOR GENERATING A WEIGHTING COEFFICIENT USING INTER-FRAME DIFFERENCE SIGNALS AT A CENTER PIXEL FOR DETECTING MOTION INFORMATION AND AT PIXELS SURROUNDING THE CENTER PIXEL AND QUANTIZING THE DIFFERENCE SIGNAL AT THE CENTER PIXEL
[75] Inventor: Masahiro Saiki, Chofu, Japan
[73] Assignee: Matsushita Electric Industrial Co., Ltd., Osaka, Japan
[21] Appl. No.: 251,273
[22] Filed: May 31,1994
[30] Foreign Application Priority Data
Jun. 8, 1993 [JP] Japan 5-137287
[51] Int. CI.6 H04N7/01
[52] U.S. CI 348/452; 348/699
[58] Field of Search 348/699-701,
348/452, 458; H04N 7/01
[56] References Cited
U.S. PATENT DOCUMENTS
4,884,136 12/1989 Ninomiya et al 348/701
4,941,045 6/1990 Birch 348/700
5,095,354 3/1992 Sokawa et al 348/701
5,142,362 8/1992 Masera et al 348/700
5,175,618 12/1992 Ueda et al 358/136
5,289,274 2/1994 Kondo 348/699
5,381,183 1/1995 Ishizuka et al 348/458
OTHER PUBLICATIONS
Yutaka Tanaka et al; "Processing Frame Difference Signals for Detection of Moving Areas"; Jul. 25, 1986; pp. 59-64.
Primary Examiner—Victor R. Kostak
Attorney, Agent, or Firm—Watson Cole Stevens Davis,
P.L.L.C.
[57] ABSTRACT
The motion signal detection method achieves splendid motion signal detection both from a video signal having an inter-frame difference signal of the same level as noise and a video signal obtained when a fine-patterned object moves in parallel translation. A video signal processing apparatus is provided for use with the above-mentioned motion signal detection method. The inter-frame difference signal obtained by a subtracter is input to the space expander circuit and then to a weighting coefficient generating circuit to obtain a weighting coefficient, and on the other hand, the inter-frame difference signal is input to an absolute value calculating circuit and a low pass filter, and the output signal is digitized by a quantizing circuit by using a quantizing parameter, which is controlled by the weighting coefficient.
15 Claims, 5 Drawing Sheets
