Two-dimensional code reader

A two-dimensional code reader for accurate and fast reading of a two-dimensional code image containing luminance unevenness caused by variations in illumination. To binarize cells, first the gray levels of the pixels at the center points of the cells are extracted, a local threshold value is found o...

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Bibliographic Details
Main Authors INOUE KATSUSHI, KOBAYASHI KEIICHI, KANNON TETSUYA, KOJIMA YOSHIHIRO
Format Patent
LanguageEnglish
Published 30.01.2001
Edition7
Subjects
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Summary:A two-dimensional code reader for accurate and fast reading of a two-dimensional code image containing luminance unevenness caused by variations in illumination. To binarize cells, first the gray levels of the pixels at the center points of the cells are extracted, a local threshold value is found only from the extracted gray levels, and the gray levels are compared with the local threshold value, thereby binarizing the cells.
Bibliography:Application Number: US19990443614