中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

21 records (took 0.022 seconds)

    Extended working range dataform reader with reduced power consumption
    14.
    发明专利
    Extended working range dataform reader with reduced power consumption 未知

    公开(公告)号：AU6679696A

    公开(公告)日：1997-02-26

    申请号：AU6679696

    申请日：1996-07-25

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： WANG YNJIUN P ,  JU PAUL P

    IPC: G06K7/00 ,  G01J3/10 ,  G01J3/28 ,  G01J3/51 ,  G01J5/08 ,  G06K7/10

    Abstract: An extended working range dataform reader with reduced power consumption having a camera assembly and a circuit control board including game control circuitry and exposure control circuitry configured to set an initial gain value and an initial exposure period, respectively, resulting from a previous dataform reading session. Subsequent fields of image data are captured by the camera which are used to correct the gain and exposure relative to the initial values for gain and exposure period, thereby reducing the latency period for realizing correct values and reducing power consumption during power up. Furthermore, the gain control system and the exposure control system each utilize an open loop feedback such that successive fields of image data captured by the camera are utilized to calculate correct values, thereby reducing the latency time for realizing a correct value. Additionally, a reader module is provide for use in a dataform reader that emulates a laser module such that the dataform reader module can be readily integrated into existing laser-based dataform reading systems. Preferably, laser model emulation circuitry included in the dataform reader module emulates output of a laser scan module and a control circuit board in which the emulation circuitry is realized has an output port constructed and arranged to communicate with devices configured for use with a laser scanner.

    Dataform readers and methods
    15.
    发明专利
    Dataform readers and methods 未知

    公开(公告)号：AU3972895A

    公开(公告)日：1996-05-23

    申请号：AU3972895

    申请日：1995-10-31

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： WANG YNJIUN P ,  JU PAUL P

    IPC: G06K7/015 ,  G06K7/10

    Abstract: Dataform readers and methods provide operation with a sequence of overlapping exposure periods for successive lines of sensor elements of an array. Also, the exposure periods for successive lines of sensor elements, or successive subsets of lines, can be independently determined. In operation of a dataform reader illumination of a target area is turned on before exposure of the first line of sensor elements, each line of sensor elements is exposed by reflected illumination in an exposure period which overlaps with the exposure period of one or more other lines, and illumination is then turned off. Using a CMOS construction, for example, the level of image signals read from one line of sensor elements is referred to a look-up table to determine an appropriate exposure period for a subsequent line or lines of elements of an array. This process is repeated to achieve exposure periods adjusted for localized exposure conditions for each successive line or subset of lines of sensor elements.

    Sub-pixel dataform reader
    17.
    发明专利
    Sub-pixel dataform reader 未知

    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

    IPC: G06K7/10 ,  G06K9/50

    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.

    Anti-hand-jittering dataform readers and methods
    18.
    发明专利
    Anti-hand-jittering dataform readers and methods 未知

    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

    IPC: G06K7/10 ,  G06K7/14

    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; €ƒ€ƒ€ƒcharacterised 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.

    Packet bar code encoding and decoding
    19.
    发明专利
    Packet bar code encoding and decoding 未知

    公开(公告)号：AU3148495A

    公开(公告)日：1996-02-22

    申请号：AU3148495

    申请日：1995-07-26

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： WANG YNJIUN P

    IPC: G06K7/00 ,  G06K19/06 ,  G06V30/224

    Abstract: A machine readable code in a form such as a bar code uses self-addressed address/data packets which can be positioned in arbitrary orders and configurations. Additional benefits, such as ability to use extended scan angles for decoding and reduction in required code management data, also result from the self-contained nature of the address/data packet components of packet codes. A sequence of data is separated into units of data which are encoded in data portions of packets each also including an address portion which identifies the position of such data unit relative to the original sequence of data. The individual packets may then be positioned in a wide variety of configurations, rectangular and otherwise, with the individual packets in any order, sequential or otherwise. Even where packets are aligned in an extended row, the usable scan angle range is determined by the width to height aspect ratio of individual packets and not limited by the much higher aspect ratio of the row of packets. Methods and systems for encoding and decoding packet codes are described.

Patent Agency Ranking