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    2.
    发明专利
    未知

    公开(公告)号：AT338983T

    公开(公告)日：2006-09-15

    申请号：AT96936617

    申请日：1996-10-18

    Applicant: SYMBOL TECHNOLOGIES INC

    Inventor： CHU JOHN B ,  JU PAUL P ,  WANG YNJUIN P

    IPC: G01J3/10 ,  G01J3/28 ,  G01J3/51 ,  G01J5/08 ,  G06K7/10 ,  G06G7/00 ,  G06K7/14

    Abstract: A portable data collection system is disclosed. The system includes a dataform reader module having a board camera electrically coupled to a control and decoder board in an open loop feedback configuration. The control and decoder board includes fuzzy logic image control circuitry which analyzes a captured frame of a video image including a dataform produced by the board camera. Based on the analysis of the captured frame, the fuzzy logic image control circuitry generates control signals to adjust operating parameters of the board camera such that an image suitable for decoding is produced.

    Extended working range dataform reader with reduced power consumption
    3.
    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
    4.
    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.

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