Encoded symbol reader with calculation of magnification
First Claim
Patent Images
1. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol having a matrix of cells, said encoded symbol reader comprising:
- means for reading an image of said encoded symbol, said reading means outputting an electrical signal corresponding to said read image;
means for processing said output electrical signal; and
means for storing information related to a processing of said output signal;
wherein said reading means comprises;
means for sensing said image; and
means for forming said image on said sensing means, andwherein said processing means comprises;
means for detecting a size of said image formed on said sensing means; and
means for calculating a magnification of said image forming means based on said size of said image detected by said detecting means and a size of said encoded symbol.
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Abstract
An encoded symbol reader for reading two-dimensional encoded symbols which can calculate a magnification of an image of the two-dimensional symbol. The encoded symbol is comprised of a n×n matrix of cells. The encoded symbol reader senses an image formed by an optical system, and detect a size of the formed image. Then, a magnification of the image is calculated based on the size of the image, and a length of the cell of the encoded symbol and a number of the cells.
16 Citations
12 Claims
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1. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol having a matrix of cells, said encoded symbol reader comprising:
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means for reading an image of said encoded symbol, said reading means outputting an electrical signal corresponding to said read image; means for processing said output electrical signal; and means for storing information related to a processing of said output signal; wherein said reading means comprises; means for sensing said image; and means for forming said image on said sensing means, and wherein said processing means comprises; means for detecting a size of said image formed on said sensing means; and means for calculating a magnification of said image forming means based on said size of said image detected by said detecting means and a size of said encoded symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol having a matrix of cells, said encoded symbol reader comprising:
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means for forming an image of said encoded symbol; means for sensing said formed image; means for detecting a size of said image formed on said sensing means; means for calculating a magnification of said formed image based on said size of said image detected by said detecting means, a length of a cell and a number of said cells in said encoded symbol; and means for storing said measured magnification.
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11. A method for determining a magnification of an encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol having a matrix of cells, said method comprising the steps of:
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forming an image of encoded symbol; sensing said formed image; detecting a size of said image; calculating a magnification of said formed image based on said size of said image detected by said detecting step, and a length of said cell and a number of said cells in said encoded symbol; and storing said measured magnification.
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12. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol having a matrix of cells, said encoded symbol reader comprising:
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means for forming an image of said encoded symbol; means for sensing said formed image; means for storing image magnification, the number of cells in said matrix, and a size of said cells; and means for decoding said encoded symbol in accordance with said image sensed by said sensing means, said image magnification, said number of cells, and said size of cells stored in said storing means.
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Specification