Registers – Calculators – Including means utilizing fluid – e.g. – fluid amplifiers
Patent
1995-03-14
1998-03-10
Hajec, Donald T.
Registers
Calculators
Including means utilizing fluid, e.g., fluid amplifiers
235462, G06K 1906, G06K 710
Patent
active
057264350
ABSTRACT:
A two-dimensional code 1 consists of three positioning symbols 2, a data region 3, timing cells 4 and an apex detecting cell 5. The shape of the whole code 1 is a square having the same number of vertical and lateral cells. A scanning line passing through the center of each positioning symbols 2 always gives a constant frequency component ratio--dark:light:dark:light:dark=1:1:3:1:1, irrespective of the scanning direction. For this reason, even if a rotational angle of the two-dimensional code is not certain, the specific frequency component ratio of each positioning symbol 2 can be easily detected by executing only one scanning operation in a predetermined direction. Hence, the coordinates of the center of each positioning symbols 2 can be easily found. Thus, the position of the two-dimensional code 1 is quickly identified.
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Hara Masahiro
Nagaya Takayuki
Nojiri Tadao
Uchiyama Yuji
Watabe Motoaki
Hajec Donald T.
Kabushiki Kaisha Toyota Chuo Kenkyusho
Le Thien Minh
Nippondenso Co. Ltd.
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