Title:
HIGH FREQUENCY EMPHASIS AMOUNT CONTROL DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/105839
Kind Code:
A1
Abstract:
A first discrete Fourier transform unit (11) performs a two-dimensional discrete Fourier transform on an input image signal and generates a first frequency spectrum. A second discrete Fourier transform unit (21) performs a two-dimensional discrete Fourier transform on an output image signal output from a high frequency emphasis circuit (30) and generates a second frequency spectrum. First and second high frequency component index generation units (total sum calculation units 13 and 23) respectively generate, on the basis of the first and second frequency spectra, first and second high frequency component indexes which indicate total amounts of high frequency components. A high frequency component emphasis ratio calculation unit (4) calculates a high frequency emphasis ratio that is a ratio between the first high frequency component index and the second high frequency component index. An emphasis amount control unit (5) generates an emphasis amount control value on the basis of the high frequency emphasis ratio and a target emphasis value, and supplies the emphasis amount control value to the high frequency emphasis circuit (30).
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Inventors:
TAKESHITA HIROSHI (JP)
Application Number:
PCT/JP2022/027990
Publication Date:
June 15, 2023
Filing Date:
July 19, 2022
Export Citation:
Assignee:
JVCKENWOOD CORP (JP)
International Classes:
H04N5/205; G06T5/00; G09G5/00; G09G5/36
Foreign References:
| JP2007336064A | 2007-12-27 | |||
| JPH0997332A | 1997-04-08 | |||
| JP2000004398A | 2000-01-07 | |||
| JP2006050494A | 2006-02-16 |
Attorney, Agent or Firm:
MIYOSHI Hidekazu et al. (JP)
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