Title:
画像符号化方法および画像装置
Document Type and Number:
Japanese Patent JP4037824
Kind Code:
B2
Abstract:
An image encoding method and an image device effective for a large number of applications without requesting any changes on the decoding side by allowing the encoding side to have processing for reducing noise generation. A pixel of gradation value of 255 corresponding to white is changed to the value outside the gradation range in the direction opposite to black. This means that the value is set to be much larger than the gradation value of 255 which is the maximum white in the color expression. The image subjected to gradation shifting is encoded to generate a ripple (31) which is larger than the gradation value of 255 in the white part of the image. However, the abnormal state of the ripple-like image in the decoded image before clipping is formed around the gradation value higher than the gradation value of 255.
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Inventors:
Hideaki Yamada
Application Number:
JP2003504662A
Publication Date:
January 23, 2008
Filing Date:
June 06, 2002
Export Citation:
Assignee:
Sharp Corporation
International Classes:
H04N1/41; G06T1/00; H04N1/40; H04N1/46; H04N1/60; H04N11/04
Domestic Patent References:
| JP5130413A | ||||
| JP2001016447A | ||||
| JP2000175049A |
Attorney, Agent or Firm:
Keiichiro Saikyo
Takeshi Sugiyama
Minetarou Hirose
Takeshi Sugiyama
Minetarou Hirose