PICTURE DATA ADJUSTMENT SYSTEM FOR PICTURE READER

PURPOSE:To effectively correct the dispersion of the conversion characteristic of a CCD line sensor among chips and among in-chip picture elements by applying offset adjustment after gain adjustment and dark correction of picture element units. CONSTITUTION:A picture data adjustment means 2 applies...

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Bibliographic Details
Main Authors IMOTO YOSHIYA, TAKASHIMA IZUMI, OTAKI MITSUO, NAKAMURA HIDEYASU
Format Patent
LanguageEnglish
Published 25.07.1990
Subjects
CINEMATOGRAPHY
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:PURPOSE:To effectively correct the dispersion of the conversion characteristic of a CCD line sensor among chips and among in-chip picture elements by applying offset adjustment after gain adjustment and dark correction of picture element units. CONSTITUTION:A picture data adjustment means 2 applies gain adjustment and offset adjustment to an analog signal being the result of reading a reflected luminous quantity of an original by a line sensor 1, an A/D conversion means 3d converts the signal into a digital signal, then dark correction is applied through a picture data adjustment means 4, the signal is converted into a density signal and an original read signal is obtained. After gain adjustment 7 is applied, offset adjustment 8 and dark correction 9 in the unit of picture elements are executed. Thus, the offset adjustment 8 is executed after the gain adjustment 7 in this way. Thus, although there is some fluctuation after the gain adjustment in a low density area being a white level signal area, the characteristic at the high density area is made especially stable and uneven contrast is attained.
Bibliography:Application Number: JP19890008967