Title:
IMAGE ADJUSTMENT METHOD, PROGRAM, AND IMAGE ADJUSTMENT DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/153348
Kind Code:
A1
Abstract:
One embodiment of this invention is an image adjustment method for: deriving statistical amounts from a first pixel having a first luminance and a second pixel having a second luminance, both of which are within a local region in an input image; deriving a two-dimensional luminance histogram that uses the statistical amounts as numerical values corresponding to the first luminance and the second luminance; deriving numerical values by using a weighting factor determined according to a third luminance, which is greater than the first luminance and not greater than the second luminance, to weight the two-dimensional luminance histogram; deriving a one-dimensional luminance histogram using the numerical values as numerical values corresponding to the third luminance; derives a luminance conversion function such that the derived one-dimensional luminance histogram will be converted into a prescribed histogram; and uses the luminance conversion function to convert the luminance of each pixel of the input image.
Inventors:
SUN YONGQING (JP)
WU XIAOMENG (JP)
KIMURA AKISATO (JP)
KASHINO KUNIO (JP)
WU XIAOMENG (JP)
KIMURA AKISATO (JP)
KASHINO KUNIO (JP)
Application Number:
PCT/JP2021/000611
Publication Date:
July 21, 2022
Filing Date:
January 12, 2021
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04N5/235; G06T5/00; G06T5/40
Foreign References:
| JP2019016117A | 2019-01-31 | |||
| JP2008072253A | 2008-03-27 |
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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