Title:
PICTURE MAGNIFICATION DEVICE
Document Type and Number:
Japanese Patent JP3108177
Kind Code:
B2
Abstract:
PURPOSE: To magnify a picture with simple circuit configuration by obtaining a required filter coefficient with respect to a conversion ratio of a sampling frequency with interpolation arithmetic operation from discrete data stored in a coefficient memory.
CONSTITUTION: An input digital video signal is stored tentatively to a frame memory 1 and a read control means 2 outputs the signal to a digital filter 3 in a rate in response to an output sampling frequency. Then data are stored in a coefficient memory 6 by using a weighted function having a desired frequency characteristic as discrete data for each prescribed interval and a coefficient generating means 4 obtains the weighting coefficient in response to the magnification factor by applying interpolation arithmetic operation to the discrete data of the coefficient memory 6. Then the input digital video signal and the weighting coefficient are subject to produce sum arithmetic operation by a shift register 31 and a multiplier 32. Thus, the picture is magnified with a small capacity memory and simple circuit configuration.
Inventors:
Isao Imazato
Takahisa Ando
Takashi Noguchi
Nobuaki Uwa
one on the water
Takahisa Ando
Takashi Noguchi
Nobuaki Uwa
one on the water
Application Number:
JP2180092A
Publication Date:
November 13, 2000
Filing Date:
January 10, 1992
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
G06T3/40; G09G5/36; H04N5/262; H04N7/24; H04N19/00; H04N1/393; H04N19/423; H04N19/426; H04N19/59; H04N19/80; (IPC1-7): H04N5/262; G06T3/40; G09G5/36; H04N1/393; H04N7/24
Domestic Patent References:
| JP5897968A | ||||
| JP6337708A |
Attorney, Agent or Firm:
Hiroshi Torii