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公开(公告)号：US20180183990A1
公开(公告)日：2018-06-28
申请号：US15843396
申请日：2017-12-15
Applicant: Hand Held Products, Inc.
Inventor： Feng Chen , Jie Ren , Haiming Qu , Qing Zhang
CPC classification number: H04N5/2357 , G06K7/10544 , H04N1/02815 , H04N1/193 , H04N5/2256 , H04N5/2258 , H04N5/2353 , H04N5/2354 , H04N5/3535 , H04N13/243 , H04N13/254 , H04N13/296
Abstract: A method and system for synchronizing active illumination pulses in a multi-sensor imager is provided. The method has the steps of: providing an illumination pulse for each of N sensors from an illumination control block; setting each of N illumination pulses to have the same pulse period and active pulse width; setting the active width pulse for each of N illumination pulses to have maximum exposure time for each of N image sensors; ensuring during initialization of image capture that the time to capture a frame plus the time interval between subsequent image captures is the same for each sensor; monitoring the frame synchronous signal and corresponding illumination pulse for each sensor; obtaining the offset periods between subsequent frame synchronous signals from the monitoring step; adjusting the interval between frame captures; and aligning the negative edge of the frame synchronous signal and the corresponding illumination pulse.
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公开(公告)号：US09805237B2
公开(公告)日：2017-10-31
申请号：US15225190
申请日：2016-08-01
Applicant: Hand Held Products, Inc.
Inventor： Chen Feng , Jie Ren , Jun Lu , Haiming Qu , Qing Zhang
CPC classification number: G06K7/10851 , G06K7/10554 , G06K7/10574 , G06K19/06028
Abstract: Systems and methods for cancelling noise caused by the flicker of ambient lights are provided. Such noise cancelling systems and methods may be incorporated in a laser-based barcode scanning device. In one example, a barcode scanning device includes a light source, a first sensor, a second sensor, and a noise cancelling circuit. The light source is configured to emit a beam of light. The first sensor is configured to detect a first optical signal indicative of light reflecting off of a barcode. The reflected light may originate from the light source and from at least one ambient light source in the vicinity of the barcode scanning device. The second sensor is configured to detect a second optical signal indicative of light originating from the at least one ambient light source. The noise cancelling circuit is configured to obtain a noise-cancelled scanning signal from the first and second optical signals.
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公开(公告)号：US10904453B2
公开(公告)日：2021-01-26
申请号：US15843396
申请日：2017-12-15
Applicant: Hand Held Products, Inc.
Inventor： Feng Chen , Jie Ren , Haiming Qu , Qing Zhang
IPC: H04N5/225 , H04N5/353 , H04N13/243 , H04N13/254 , H04N13/296 , H04N5/235
Abstract: Examples embodiments of a method and system for synchronizing active illumination pulses in a multi-sensor imager is provided. Example embodiments of the method disclosed herein include the provision of an illumination pulse for each of N sensors, each of N illumination pulses are set to have the same pulse period and active pulse width. Moreover, example embodiments include setting the active width pulse for each of the N illumination pulses to have maximum exposure time for each of N image sensors, and in further examples, ensuring that the time to capture a frame plus the time interval between subsequent image captures is the same for each sensor. In yet further examples, an offset period between subsequent frame synchronous signals is determined. In yet further example embodiments, an interval between frame captures is adjusted and a negative edge of the frame synchronous signal and an illumination pulse is aligned.
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公开(公告)号：US20170083730A1
公开(公告)日：2017-03-23
申请号：US15225190
申请日：2016-08-01
Applicant: Hand Held Products, Inc.
Inventor： Chen Feng , Jie Ren , Jun Lu , Haiming Qu , Qing Zhang
CPC classification number: G06K7/10851 , G06K7/10554 , G06K7/10574 , G06K19/06028
Abstract: Systems and methods for cancelling noise caused by the flicker of ambient lights are provided. Such noise cancelling systems and methods may be incorporated in a laser-based barcode scanning device. In one example, a barcode scanning device includes a light source, a first sensor, a second sensor, and a noise cancelling circuit. The light source is configured to emit a beam of light. The first sensor is configured to detect a first optical signal indicative of light reflecting off of a barcode. The reflected light may originate from the light source and from at least one ambient light source in the vicinity of the barcode scanning device. The second sensor is configured to detect a second optical signal indicative of light originating from the at least one ambient light source. The noise cancelling circuit is configured to obtain a noise-cancelled scanning signal from the first and second optical signals.
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