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1. 发明授权

EP0797812B1 DATAFORM READER 失效
标题翻译：数据表格阅读器
公开(公告)号：EP0797812B1
公开(公告)日：2003-01-02
申请号：EP96936442.1
申请日：1996-10-10
申请人： Meta Holding Corporation
发明人： WANG, Ynjiun, P. , YE, Angi
IPC分类号： G06K7/10
CPC分类号： G06K7/1093 , G06K7/1452

2. 发明公开

EP0782734A1 EXTENDED WORKING RANGE DATAFORM READER WITH REDUCED POWER CONSUMPTION 失效
标题翻译：数据表格阅读器对于降低功耗扩展范围
公开(公告)号：EP0782734A1
公开(公告)日：1997-07-09
申请号：EP96926765.0
申请日：1996-07-25
申请人： Meta Holding Corporation
发明人： WANG, Ynjiun, P. , JU, Paul, P.
IPC分类号： G06K7 , G01J3 , G01J5
CPC分类号： G01J3/51 , G01J3/0272 , G01J3/10 , G01J3/2803 , G01J5/08 , G06K7/10564 , G06K7/10722 , G06K7/10732 , G06K7/10752 , G06K7/10792 , G06K7/10851 , G06K7/10881 , G06K7/10891 , G06K7/1092 , G06K2007/10524 , G06K2207/1011
摘要： An extended working range dataform reader (10) having a camera assembly (26) and a circuit board including gain and exposure control circuitry (56) which sets an initial gain value and exposure period from a previous data form reading session. If necessary, the gain and exposure are adjusted from their initial settings using image data from successive image fields in an open loop feedback scheme. The latency period for realizing the correct values and resultant power consumption is thereby reduced. Additionally, the readermodule (10) realized on the control circuit board (56) has an output port (53) which emulates the output of a laser scan module in order to readily integrate with and communicate with existing laser based dataform reading systems and devices.

3. 发明公开

EP0797812A1 SUB-PIXEL DATAFORM READER 失效
标题翻译：亚像素数据表格阅读器
公开(公告)号：EP0797812A1
公开(公告)日：1997-10-01
申请号：EP96936442.0
申请日：1996-10-10
申请人： Meta Holding Corporation
发明人： WANG, Ynjiun, P. , YE, Angi
IPC分类号： G06K7 , G06K9
CPC分类号： G06K7/1093 , G06K7/1452
摘要： Sub-pixel processing of image data representing a dataform, such as a 2D bar code, enables reading of dataforms including more data/smaller elements, without costly increases in sensor and memory capacity. Whole pixel processing is employed for pixel-per-element resolutions of two or better. Sub-pixel cell edge transition location in image data is enhanced by use of a dynamically implemented noise margin applied with bands of gray scale values (150, 152) designated within the enveloppe of applicable gray scale maximum (119) and minimum (120) values. Sub-pixel cell edge transition location employs selection of transition segments (121-124), subject to the noise margin, and determination of a dynamic threshold (158) for each relevant transition segment (122). The intersection of the threshold (158) and the transition segment (122) is then indicative of the location of the cell edge transition along a sampling line crossing the dataform. The process is repeated for successive cell edges along image data sampling lines crossing successive rows of dataform elements. Run length data representing cell edge transition locations is constructed and usable for dataform decoding.

4. 发明公开

EP0791204A1 ANTI-HAND-JITTERING DATAFORM READERS AND METHODS 失效
标题翻译： ANTI-HAND ZITTER DATAFORMAT Reader和程序
公开(公告)号：EP0791204A1
公开(公告)日：1997-08-27
申请号：EP96931534.0
申请日：1996-09-12
申请人： Meta Holding Corporation
发明人： WANG, Ynjiun, P. , YE, Angi
IPC分类号： G06K7
CPC分类号： G06K7/1093 , G06K7/10722 , G06K7/10851 , G06K7/10861 , G06K7/14 , G06K7/1491
摘要： Dataform readers using two-dimensional sensor array cameras provide image frames comprising successive first (Fig. 2B) and second (Fig. 2C) fields of image data. In hand-held operation, hand jitter results in image offset (46) causing registration errors between fields. Resolution and decoding performance are enhanced by described readers and methods. Decoding is implemented first by use of image data of a first field (52) and the results of such decoding are supplemented by results of decoding of remaining portions of the dataform by use of second field image data (58). Decoding may also be carried out by first determining the magnitude of a disparity vector (70) extending in the direction of image offset (46). The disparity vector is then used to provide enhanced decoding by use of first field image data and registration-corrected second field image data (72).

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