Patent Application: US-201514936008-A

Abstract:
a system and method for providing visual feedback to facilitate multi - code reading is presented . the visual feedback will project a read status for each code scanned . the visual feedback for a particular code will be projected onto that code . for example , an “ x ” projected onto a code would indicated that this code was not read and needed to be scanned again . this visual feedback minimizes the number of codes that need to be rescanned in the case of a read error .

Description:
the present invention embraces a system and method for providing visual feedback to facilitate multi - code ( e . g ., barcode ) reading ( i . e ., scanning ). codes , such as barcodes ( e . g ., linear barcodes , two dimension barcodes ) have found use in a wide variety of applications ( e . g ., shipping ). increasingly multiple codes are affixed to the same item to convey information pertinent to different users and / or pertinent at different times ( e . g ., different stages of the shipping process ). often multiple barcodes are arranged in a cluster ( i . e ., set ) so that scanning each barcode becomes easier . the code set may include multiple codes of the same symbology ( e . g ., all codes are linear barcodes ) or may include multiple codes of mixed symbologies ( e . g ., some codes are linear barcodes and some codes are two - dimensional barcodes ). imaging barcode scanners ( e . g ., handheld scanner ) may be configured to read multiple codes in a single scan ( i . e ., a single pull of a trigger on a hand - held scanner ). the configuration of these multi - code readers may include a setup file stored in memory that provides information ( e . g ., number of codes , each code symbology , etc .) regarding the scan to facilitate each code being read . the imaging scanner may take an image of a field of view with an imaging subsystem . the image may be stored in scanner &# 39 ; s memory and processed using algorithms running on a processor in order to locate , identify , and read each barcode in the image . in this way , the multi - code reader may enhance productivity . trouble arises , however , when one or more of the barcodes in the set is not scanned properly . successful code reading requires good print quality of the code and good image quality of the code image . image quality is typically the same for all codes in a set but may be affected by inhomogeneous illumination or shadows on a portion of the code set . various factors affect a code &# 39 ; s print quality ( e . g ., ink supply , ink smear , unwanted marks , etc .). scan errors may be difficult to understand and not immediately obvious . in some cases a multi - code scan may result in one or more barcodes of a set ( i . e ., cluster ) having an unsuccessful scan . without feedback , a failed multi - code scan may require either rescanning all the codes in the set or , in a worst case , scanning each code of the set individually . imaging barcode scanners may have a visual display to show the field of view . in some cases , feedback regarding the scan results may also be displayed using the graphical user interface ( i . e ., gui ). the present invention , however , embraces a system / method for generating feedback regarding the results of a multi - code scan in a more intuitive and ergonomic way . specifically , the feedback regarding a multi - code scan may be projected using a projector integrated with the imaging scanner . the projected feedback is adaptable and is adjusted so that each code in a code set may have a corresponding feedback message projected onto it . this feedback message may provide information regarding each barcode scan that is spatially aligned with the code set and on the item that a user is already looking at . the information in this feedback may allow a user to identify a damaged code ( i . e ., indicium ) and rescan or take another corrective action ( e . g ., manually entering in some data ). an exemplary shipping label having a set of codes ( i . e ., code set ) for reading with an imaging barcode scanner is shown in fig1 . the shipping label 1 includes several codes of the same symbology ( i . e ., linear barcodes ) 2 , 3 , 4 , 5 for scanning during the shipping process . an imaging barcode scanner configured for multi - code scanning may read these codes with one scan as long as they are contained within the scanner &# 39 ; s field of view . in this exemplary code set , one barcode suffers from printing errors . the misprinted barcode 3 may be scanned unsuccessfully . after a scan has been triggered , a digital image of the shipping label is captured by the imaging barcode scanner . the codes in the image are detected and read using a processor integrated with the imaging scanner or communicatively coupled to the imaging scanner via a data communications link . after reading the codes , the processor running algorithms assigns each code a status based on the results of the reading . a positive status is assigned to a code if the code is successfully read , while a negative status is assigned to a code if the code is read unsuccessfully ( i . e ., read error ). the processor configures a projection subsystem in the imaging scanner to project visual feedback into the scanner &# 39 ; s field of view . exemplary codes 2 , 3 , 4 , 5 on the shipping label 1 overlaid with projected visual feedback 6 , 7 , 8 , 9 , 10 regarding the read status for each code are shown in fig2 . the visual feedback for barcodes that are successfully read will be positive feedback , while the visual feedback for the unsuccessfully read barcodes will be negative feedback . as shown in fig2 , both positive and negative feedback images ( i . e ., messages ) are projected onto the shipping label 1 simultaneously . the positive feedback in this exemplary embodiment is a box to surround the code . boxes 7 , 9 , 10 ( i . e ., a positive feedback message ) are projected over barcodes without printing errors 2 , 4 , 5 , while an “ x ” ( i . e ., a negative feedback message ) 8 is projected onto the barcode with printing errors 3 . the positive and negative feedback may be embodied in a multitude of ways . while the feedback should imply the positive or negative message , it is not limited to a particular shape and / or form ( i . e ., text or graphic ). the feedback shown in fig2 further includes a projected image of a large box 6 . this large box 6 represents the imaging scanner &# 39 ; s field of view . this feedback may provide spatial context and facilitate an understanding of the scan results / feedback . for example , if a code is within the large box 6 and has neither positive or negative feedback overlaid , then a user could assume that this particular code was skipped or missed . an exemplary block diagram of a multi - code reading system with visual feedback is shown in fig3 . to scan the multi - code reading system 15 may be positioned with a target 11 in its field of view 12 ( or vice versa ). to read the codes and provide visual feedback , the multi - code reading system 15 utilizes a variety of subcomponents / subsystems . a projection subsystem projects feedback images onto codes that are printed on ( or affixed to ) the target 11 . the projection subsystem includes a projector 17 . the projector 17 includes a light source to generate and radiate light . the light source may be a laser diode ( ld ) or a light emitting diode ( led ). the light source generates light radiation in a portion of the visible ( vis ) spectrum . the projector 17 may also include a light modulator to create feedback images . the light modulator may be reflective ( e . g ., digital light processing mems device ) or transmissive ( e . g ., liquid crystal spatial light modulator ). a projection lens ( or lens group ) 16 is placed in front of the projector 17 to focus the light into a projection field of view 13 and focuses the projected light onto the target . the projection lens 16 may be fixed or variable ( e . g ., auto ) focus . an imaging subsystem captures images of items located into the imaging field of view 14 . to accomplish this , the imaging subsystem may use an imaging lens 20 to render a real image of the imaging field of view 14 onto an image sensor 21 . this imaging field of view 14 overlaps ( at least partially ) with the projection field of view 13 . the image sensor 21 may be a charge coupled device ( i . e ., ccd ) or a sensor using complementary metal oxide semiconductor ( i . e ., cmos ) technology . the image sensor 21 includes a plurality of pixels that sample the real image and convert the real - image intensity into an electronic signal . a digital signal processor ( i . e ., dsp ) 23 may be included to convert the electronic signals from the image sensor 21 into a digital image and / or control the projector to create the feedback projections . a processor 18 is communicatively coupled to the projection subsystem and imaging subsystem ( e . g ., coupled to the dsp controlling the projection and imaging subsystems ). the processor 18 may be embodied in a variety of ways , such as ( but not limited to ) one or more controllers , a digital signal processor ( dsp ), an application specific integrated circuit ( asic ), a programmable gate array ( pga ), and / or a programmable logic controller ( plc ). the processor 18 is typically configured by software ( e . g ., a code - reading program ) stored in memory 24 ( e . g ., read only memory ( rom ), flash memory , random access memory ( ram ), and / or a hard - drive ). the software , when executed by the processor 18 configures the multi - code reading system to ( i ) retrieve a digital image from the memory 24 , ( ii ) detect codes within the digital image , ( iii ) read each detected code , ( iv ) select ( for each code ) a feedback image from a set of feedback images ( stored in memory ) based each code &# 39 ; s reading results , and ( v ) project the selected feedback images onto the appropriate codes . the multi - code reading system 15 may also include a user interface 25 to transmit information to a user and receive input from a user ( e . g ., trigger a scan ). the user interface 25 may include interface elements ( e . g ., touch buttons , touch screen , trigger switch , etc .). the multi - code reading system 15 may also include a communication subsystem 19 for transmitting and receiving information to / from a separate computing device and / or storage device . this communication subsystem may be wired or wireless and may enable communication with a variety of protocols ( e . g ., ieee 802 . 11 , including wi - fi ®, bluetooth ®, cdma , tdma , or gsm ). the subsystem / components in the multi - code reading system 15 are electrically connected via couplers ( e . g ., wires or fibers ), buses , and control lines to form an interconnection system 26 . the interconnection system 26 may include power buses or lines , data buses , instruction buses , address buses , etc ., which allow operation of the subsystems / components and interaction there between . a flow chart of a method for providing visual feedback regarding a multi - code scan using an imaging barcode scanner is shown in fig4 . the method begins with capturing a digital image of a set of codes ( e . g ., linear barcodes , two - dimensional barcodes , etc .) in a field of view with an imaging barcode scanner 30 . the imaging barcode scanner may be a single purposed device ( e . g ., handheld scanner ), a mode of operation in a multipurpose device ( e . g ., mobile computing device ), or a part of a larger system ( e . g ., point of sale system ). the digital image is processed to detect codes within the image 31 . next , a code is read 32 using code reading algorithms commonly used in the art . if an error is detected , ( e . g ., using error correction data encoded into the code ) then the code is assigned a negative status 35 . if the code is read successfully , however , it is assigned a positive status 34 . the steps of reading a code and assigning the code a status are repeated for each code until there are no unread codes and all codes have been assigned a status 36 . the method concludes by projecting positive feedback messages ( e . g ., a box surrounding a barcode ) onto codes having a positive status 37 , and projecting negative feedback messages onto codes having a negative status 38 . thus , the present invention embraces a system / method to provide visual feedback ( e . g ., indicia reading status information ) to a user . the feedback may be created using the indicia reader &# 39 ; s highlight beam projector to highlight indicia and convey information . this information is displayed on the target ( i . e ., object ) instead of on a display and is , therefore , intuitive and convenient . to supplement the present disclosure , this application incorporates entirely by reference the following commonly assigned patents , patent application publications , and patent applications : u . s . patent application ser . no . 13 / 367 , 978 for a laser scanning module employing an elastomeric u - hinge based laser scanning assembly , filed feb . 7 , 2012 ( feng et al . ); u . s . patent application ser . no . 29 / 458 , 405 for an electronic device , filed jun . 19 , 2013 ( fitch et al . ); u . s . patent application ser . no . 29 / 459 , 620 for an electronic device enclosure , filed jul . 2 , 2013 ( london et al . ); u . s . patent application ser . no . 29 / 468 , 118 for an electronic device case , filed sep . 26 , 2013 ( oberpriller et al . ); u . s . patent application ser . no . 14 / 150 , 393 for indicia - reader having unitary construction scanner , filed jan . 8 , 2014 ( colavito et al . ); 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