JP2023092458A - コードリーダ及び光学コード読み取り方法 - Google Patents
コードリーダ及び光学コード読み取り方法 Download PDFInfo
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- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
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- G06V30/153—Segmentation of character regions using recognition of characters or words
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- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
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- G06K7/1404—Methods for optical code recognition
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
- G06K7/1452—Methods for optical code recognition including a method step for retrieval of the optical code detecting bar code edges
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- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
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- G06K7/1404—Methods for optical code recognition
- G06K7/1439—Methods for optical code recognition including a method step for retrieval of the optical code
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- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
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- G06K7/14—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using light without selection of wavelength, e.g. sensing reflected white light
- G06K7/1404—Methods for optical code recognition
- G06K7/146—Methods for optical code recognition the method including quality enhancement steps
- G06K7/1486—Setting the threshold-width for bar codes to be decoded
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- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/22—Image preprocessing by selection of a specific region containing or referencing a pattern; Locating or processing of specific regions to guide the detection or recognition
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- G06V10/00—Arrangements for image or video recognition or understanding
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Abstract
Description
Claims (12)
- 光学コード(20)の読み取り方法であって、前記コード(20)の明度プロファイルを取得し、該明度プロファイル中の明るい部分領域と暗い部分領域を識別し、前記光学コード(20)のコード内容を読み取る方法において、
前記明度プロファイルから、明るい各部分領域における光量についての第1の総計量と、暗い各部分領域において白色レベルに対して不足している光量についての第2の総計量とを特定し、該第1及び第2の総計量に基づいて前記コード内容を読み取ることを特徴とする方法。 - 前記第1の総計量について、前記明度プロファイルをその極小のうちの2つの間でそれぞれ合計する、請求項1に記載の方法。
- 前記第2の総計量について、前記明度プロファイルをその極大のうちの2つの間でそれぞれ合計する、請求項1に記載の方法。
- 前記第2の総計量を特定するために、前記明度プロファイルを反転させてから白色レベルに相当するオフセット分だけ補償する、請求項1~3のいずれかに記載の方法。
- 前記第1の総計量及び/又は前記第2の総計量を積分法により特定する、請求項1~3のいずれかに記載の方法。
- 前記コード内容を前記第1の総計量と前記第2の総計量が交互に並んだシーケンスから特定する、請求項1~3のいずれかに記載の方法。
- 前記第1の総計量と前記第2の総計量を、特に少なくとも1つの最も細かい総計量から推定された基準値に基づいて、分類する、請求項1~3のいずれかに記載の方法。
- 前記第1の総計量と前記第2の総計量を基準値で除算してから離散化し、その際、特に前記基準値を少なくとも1つの最も細かい総計量から推定する、請求項1~3のいずれかに記載の方法。
- 前記光学コード(20)が2次元コードであり、特に、前記第1の総計量と前記第2の総計量を、極小又は極大の周囲において少なくとも1つの閾値により定められる明度境界まで特定する、請求項1~3のいずれかに記載の方法。
- 前記明度プロファイルを、それぞれにおいて第1の総計量及び第2の総計量が特定される複数の下位部分、特に矩形の下位部分、行又は列、に分割する、請求項1~3のいずれかに記載の方法。
- 前記明度プロファイルを複数回、異なる下位部分に分割することで、第1及び第2の総計量を複数回特定し、複数の結果を、特に論理結合により、互いに差し引き又は比較する、請求項10に記載の方法。
- 光学コード(20)を読み取るためのコードリーダ(10)であって、前記光学コード(20)の明度プロファイルを取得するための受光器(24)と、前記明度プロファイル中の明るい部分領域と暗い部分領域を識別して前記光学コード(20)のコード内容を読み取るように構成された制御及び評価ユニット(26)とを備えるコードリーダ(10)において、
前記制御及び評価ユニット(26)が更に、前記明度プロファイルから、明るい各部分領域における光量についての第1の総計量と、暗い各部分領域において白色レベルに対して不足している光量についての第2の総計量とを特定し、該第1及び第2の総計量に基づいて前記コード内容を読み取るように構成されていることを特徴とするコードリーダ(10)。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP21216207.7A EP4202758B1 (de) | 2021-12-21 | 2021-12-21 | Codeleser und verfahren zum lesen eines optischen codes |
EP21216207 | 2021-12-21 |
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JP2023092458A true JP2023092458A (ja) | 2023-07-03 |
JP7522168B2 JP7522168B2 (ja) | 2024-07-24 |
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US (1) | US20230196808A1 (ja) |
EP (1) | EP4202758B1 (ja) |
JP (1) | JP7522168B2 (ja) |
KR (1) | KR102707532B1 (ja) |
CN (1) | CN116306727A (ja) |
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JP3994571B2 (ja) | 1999-03-25 | 2007-10-24 | 株式会社デンソー | 情報コードの2値化方法、当該2値化方法を用いた光学情報読取装置、及び当該2値化方法を用いたコード品質判断補助装置 |
JP3997694B2 (ja) * | 2000-06-28 | 2007-10-24 | セイコーエプソン株式会社 | 磁気パターンの認識方法、情報記録媒体、磁気パターン認識装置及び複合処理装置 |
JP2004054645A (ja) | 2002-07-19 | 2004-02-19 | Keyence Corp | 二次元コード読取装置、二次元コード読取方法、二次元コード読取プログラムおよびコンピュータ読取可能な記録媒体 |
JP4226291B2 (ja) | 2002-07-19 | 2009-02-18 | 株式会社キーエンス | 二次元コード読取装置 |
TWI438699B (zh) * | 2009-10-09 | 2014-05-21 | Primax Electronics Ltd | 條碼的處理方法與其相關裝置 |
US8523075B2 (en) * | 2010-09-30 | 2013-09-03 | Apple Inc. | Barcode recognition using data-driven classifier |
JP6924381B2 (ja) | 2017-09-26 | 2021-08-25 | カシオ計算機株式会社 | 防塵ケース、光源装置及び投影装置 |
WO2019145390A1 (en) | 2018-01-26 | 2019-08-01 | Universitat De Barcelona | Colour correction |
EP3789906B1 (de) * | 2019-09-05 | 2021-07-07 | Sick Ag | Bestimmen der modulgrösse eines optischen codes |
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- 2022-10-20 JP JP2022168406A patent/JP7522168B2/ja active Active
- 2022-11-22 KR KR1020220157292A patent/KR102707532B1/ko active IP Right Grant
- 2022-12-07 CN CN202211563936.6A patent/CN116306727A/zh active Pending
- 2022-12-20 US US18/084,664 patent/US20230196808A1/en active Pending
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EP4202758A1 (de) | 2023-06-28 |
CN116306727A (zh) | 2023-06-23 |
KR102707532B1 (ko) | 2024-09-13 |
EP4202758B1 (de) | 2024-10-09 |
JP7522168B2 (ja) | 2024-07-24 |
US20230196808A1 (en) | 2023-06-22 |
KR20230094968A (ko) | 2023-06-28 |
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