Encoded symbol reader which determines the uniformity of brightness of the background image
First Claim
Patent Images
1. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol reader comprising:
- means for reading an image of said encoded symbol and for reading a background image, the background image comprising an image representative of a background area on which said encoded symbol is encoded, said reading means outputting an electrical signal corresponding to each 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 processing means determines a uniformity of brightness of the background image, said processing means comprising means for capturing the background image, examining said captured background image and detecting whether a uniformity of a brightness of the captured background image is within a predetermined range, and if said captured background image uniformity of brightness is within said predetermined range, determining data related to the uniformity of brightness of the background image read by said reading means.
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Abstract
In an encoded symbol that is read by an encoded symbol reader, an image of the encoded symbol is read and a ratio of a minimum and maximum values of the electrical signals corresponding to the image is determined. If the ratio is larger than a predetermined value, the brightness of the image is determined to be uniform.
26 Citations
25 Claims
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1. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol reader comprising:
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means for reading an image of said encoded symbol and for reading a background image, the background image comprising an image representative of a background area on which said encoded symbol is encoded, said reading means outputting an electrical signal corresponding to each 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 processing means determines a uniformity of brightness of the background image, said processing means comprising means for capturing the background image, examining said captured background image and detecting whether a uniformity of a brightness of the captured background image is within a predetermined range, and if said captured background image uniformity of brightness is within said predetermined range, determining data related to the uniformity of brightness of the background image read by said reading means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 20, 22)
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17. A method for reading an encoded symbol that is read by an encoded symbol reader, said method comprising the steps of:
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determining a uniformity of brightness of a background image, the background image being an image representative of a background area on which the encoded symbol is encoded, by capturing the background image, examining the captured background image to determine whether the uniformity of brightness of the captured background image is within a predetermined range, and determining data related to the uniformity of brightness of the background image if the uniformity of brightness of the captured background brightness is within the predetermined range; reading an image of said encoded symbol; and outputting an electrical signal in accordance with said read encoded symbol image and the data related to the uniformity of brightness of the background image. - View Dependent Claims (18, 19, 21, 23, 24)
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25. An encoded symbol reader for reading a two-dimensional encoded symbol, said encoded symbol reader comprising:
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a reader which reads an image of said encoded symbol and which reads a background image, the background image comprising an image representative of a background area on which said encoded symbol is encoded, said reader outputting an electrical signal corresponding to each said read image; a system which processes said output electrical signal; and a storage in which information related to a processing of said output signal is stored, wherein said system determines a uniformity of brightness of the background image and includes a system which captures the background image, examines said captured background image and detects whether a uniformity of a brightness of the captured background image is within a predetermined range, and if said captured background image uniformity of brightness is within said predetermined range, determines data related to the uniformity of brightness of the background image read by said reader.
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Specification