Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD AND PROCESSOR FOR IMAGE PROCESSING
Document Type and Number:
Japanese Patent JPH1079885
Kind Code:
A
Abstract:

To make light a part which becomes a shadow with backlight and reduce the loss of details for a light part.

An inflection indication value α is set for a low-luminance part of an input and a value β (e.g. 220) which is slightly less than the maximum value (set to 255) of luminance is selected as an output value, corresponding to the inflection indication value α and regarded as an inflection point (p); and the relation between the input and an output is represented with a straight line (which may be a tone curve), connecting the coordinates (0, 0) of the origin and the coordinates (α, β) of the inflection point (p) until the inputted luminance value reaches the said inflection indication point α and then represented with a straight line connecting the coordinates (α, β) of the inflection point (p) and the coordinates (255, 255) of the maximum value of the input and output after the input value exceeds the inflection point (a), thus generating a conversion table. This conversion table is used to perform a converting process.


Inventors:
MURAYAMA YASUHIKO
Application Number:
JP1997000185559
Publication Date:
March 24, 1998
Filing Date:
July 10, 1997
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
SEIKO EPSON CORP
International Classes:
H04N5/235; H04N5/243; H04N9/04; (IPC1-7): H04N5/235; H04N5/243; H04N9/04
Attorney, Agent or Firm:
鈴木 喜三郎 (外2名)