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Patent Agency Ranking
公开(公告)号：DE69633908T2
公开(公告)日：2005-11-24
申请号：DE69633908
申请日：1996-09-12
Applicant: SYMBOL TECHNOLOGIES INC
Abstract: A dataform reader, configured to reduce effects of image offset causing registration error between sequential fields of image data, comprising: a sensor array (14) responsive to illumination reflected from a dataform to provide signals representative of illumination levels on first and second groups of sensors respectively representing first and second field images subject to image offset; a memory (30) coupled to said sensor array to store first field image data representative of said illumination levels on the first group of sensors and to store second field image data representative of said illumination levels on the second group of sensors; characterised by a processor (40) comprising means for determining the magnitude of at least one disparity vector extending in a direction representative of said image offset, by utilising the image data of said first and second fields, and means utilising said disparity vector magnitude to provide enhanced decoding of said dataform by use of image data of both said first and second fields.
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公开(公告)号：DE69633908D1
公开(公告)日：2004-12-30
申请号：DE69633908
申请日：1996-09-12
Applicant: SYMBOL TECHNOLOGIES INC
Abstract: A dataform reader, configured to reduce effects of image offset causing registration error between sequential fields of image data, comprising: a sensor array (14) responsive to illumination reflected from a dataform to provide signals representative of illumination levels on first and second groups of sensors respectively representing first and second field images subject to image offset; a memory (30) coupled to said sensor array to store first field image data representative of said illumination levels on the first group of sensors and to store second field image data representative of said illumination levels on the second group of sensors; characterised by a processor (40) comprising means for determining the magnitude of at least one disparity vector extending in a direction representative of said image offset, by utilising the image data of said first and second fields, and means utilising said disparity vector magnitude to provide enhanced decoding of said dataform by use of image data of both said first and second fields.
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公开(公告)号：DE69625583T2
公开(公告)日：2004-02-19
申请号：DE69625583
申请日：1996-10-10
Applicant: SYMBOL TECHNOLOGIES INC
Abstract: 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 designated within the envelope of applicable gray scale maximum and minimum values. Sub-pixel cell edge transition location employs selection of transition segments (subject to the noise margin) and determination of a dynamic threshold for each relevant transition segment. The intersection of the threshold and the transition segment 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 and for additional sampling lines crossing successive rows of dataform elements. Run length data representing cell edge transition locations is constructed and usable for dataform decoding.
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公开(公告)号：AU7444296A
公开(公告)日：1997-04-30
申请号：AU7444296
申请日：1996-10-10
Applicant: SYMBOL TECHNOLOGIES INC
Inventor： WANG YNJIUN P , YE ANGI
Abstract: 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 designated within the envelope of applicable gray scale maximum and minimum values. Sub-pixel cell edge transition location employs selection of transition segments (subject to the noise margin) and determination of a dynamic threshold for each relevant transition segment. The intersection of the threshold and the transition segment 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 and for additional sampling lines crossing successive rows of dataform elements. Run length data representing cell edge transition locations is constructed and usable for dataform decoding.
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公开(公告)号：AU7018596A
公开(公告)日：1997-04-01
申请号：AU7018596
申请日：1996-09-12
Applicant: SYMBOL TECHNOLOGIES INC
Inventor： WANG YNJIUN P , YE ANGI
Abstract: A dataform reader, configured to reduce effects of image offset causing registration error between sequential fields of image data, comprising: a sensor array (14) responsive to illumination reflected from a dataform to provide signals representative of illumination levels on first and second groups of sensors respectively representing first and second field images subject to image offset; a memory (30) coupled to said sensor array to store first field image data representative of said illumination levels on the first group of sensors and to store second field image data representative of said illumination levels on the second group of sensors; characterised by a processor (40) comprising means for determining the magnitude of at least one disparity vector extending in a direction representative of said image offset, by utilising the image data of said first and second fields, and means utilising said disparity vector magnitude to provide enhanced decoding of said dataform by use of image data of both said first and second fields.
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