AUTO-EXPOSURE METHOD USING CONTINUOUS VIDEO FRAMES UNDER CONTROLLED ILLUMINATION

    公开(公告)号:EP3699807A1

    公开(公告)日:2020-08-26

    申请号:EP20170419.4

    申请日:2012-02-01

    IPC分类号: G06K7/10

    摘要: An adaptive strobe illumination control process for use in a digital image capture and processing system. In general, the process involves: (i) illuminating an object in the field of view (FOV) with several different pulses of strobe (i.e. stroboscopic) illumination over a pair of consecutive video image frames; (ii) detecting digital images of the illuminated object over these consecutive image frames; and (iii) decode processing the digital images in an effort to read a code symbol graphically encoded therein. In a first illustrative embodiment, upon failure to read a code symbol graphically encoded in one of the first and second images, these digital images are analyzed in real-time, and based on the results of this real-time image analysis, the exposure time (i.e. photonic integration time interval) is automatically adjusted during subsequent image frames (i.e. image acquisition cycles) according to the principles of the present disclosure. In a second illustrative embodiment, upon failure to read a code symbol graphically encoded in one of the first and second images, these digital images are analyzed in real-time, and based on the results of this real-time image analysis, the energy level of the strobe illumination is automatically adjusted during subsequent image frames (i.e. image acquisition cycles) according to the principles of the present disclosure.

    IMPROVED SCAN DATA SIGNAL PROCESSORS FOR LASER SCANNING CODE SYMBOL READING SYSTEMS
    5.
    发明授权
    IMPROVED SCAN DATA SIGNAL PROCESSORS FOR LASER SCANNING CODE SYMBOL READING SYSTEMS 有权
    改进的信号处理器代码采样-SIGN读取系统激光扫描

    公开(公告)号:EP1180257B1

    公开(公告)日:2005-04-27

    申请号:EP00914491.6

    申请日:2000-02-02

    IPC分类号: G06K7/10 G06K15/00

    摘要: The effects of paper/substrate noise are significantly reduced in multifocal zone laser scanning systems (1) by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers (13A-13D) that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone (FZ1-FZ5) in the laser scanning system. Two or more different pass-band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation.

    IMPROVED SCAN DATA SIGNAL PROCESSORS FOR LASER SCANNING CODE SYMBOL READING SYSTEMS
    9.
    发明公开
    IMPROVED SCAN DATA SIGNAL PROCESSORS FOR LASER SCANNING CODE SYMBOL READING SYSTEMS 有权
    改进的信号处理器代码采样-SIGN读取系统激光扫描

    公开(公告)号:EP1180257A1

    公开(公告)日:2002-02-20

    申请号:EP00914491.6

    申请日:2000-02-02

    IPC分类号: G06K7/10 G06K15/00

    摘要: The effects of paper/substrate noise are significantly reduced in multifocal zone laser scanning systems (1) by processing analog scan data signals with a scan data signal processor having a plurality of pass-band filters and amplifiers (13A-13D) that are automatically selected for passing only the spectral components of an analog scan data signal produced when a bar code symbol is scanned at a particular focal zone (FZ1-FZ5) in the laser scanning system. Two or more different pass-band filter structures can be provided for use in the scan data signal processor, wherein each pass-band filter structure is tuned to the spectral band associated with a particular focal zone in the laser scanning system. When a bar code symbol is scanned by a laser beam focused within the first focal zone or scanning range of the system, the pass-band filter structure associated with this focal zone or scanning range is automatically switched into operation.