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Patent Searching and Data


Title:
IMAGE PROCESSING DEVICE
Document Type and Number:
Japanese Patent JPH0614188
Kind Code:
A
Abstract:

PURPOSE: To prevent light and shade irregularity on an output image from occurring by providing a correction means which corrects the dispersion of image data due to discordance between (odd-number)th and (even-number)th black reference data.

CONSTITUTION: Correction processing is applied to a digital signal sent to a shading arithmetic part 209 based on data for shading correction stored in shading line memory 210 in advance, and the digital signal is sent to a conversion table 211, and the output level of the digital signal is corrected to the optimum output level, and it is sent to a gamma conversion part 212. In such a case, ideal density reproducing data is referred to, and a look-up table changing from a density level set as a sample to the ideal reproducing data is calculated for (odd-number)th and (even-number)th pixels respectively by applying arithmetic processing, and it is stored in a conversion table 211, and the image data after shading correction is converted by the conversion table 211, thereby, ideal image data without generating sensitivity difference for (odd-number)th and (even-number)th output can be obtained.


Inventors:
WAKAHARA SHINICHI
Application Number:
JP19336792A
Publication Date:
January 21, 1994
Filing Date:
June 26, 1992
Export Citation:
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Assignee:
RICOH KK
International Classes:
G06T1/00; G06T5/00; H04N1/04; H04N1/40; H04N1/401; H04N1/19; H04N5/202; (IPC1-7): H04N1/40; G06F15/64; G06F15/68; H04N1/04; H04N5/202
Attorney, Agent or Firm:
Hiroaki Sakai