CN109154974A - Determine the arrangement and method of target range and the reading parameter based on target range adjustment imaging reader - Google Patents

Abstract

Target is directed to along guidance axis by the way that hot spot will be aimed at, and the first image of the target by capture comprising aiming at hot spot, and the distance for the target that read by image capture in the range of operating distance is determined by capturing the second image without the target for aiming at hot spot.Each image is captured in the frame in visual field, which has from the imaging axis for aiming at axle offset.The first image data from the first image is compared by image pre-processor on the common score region of two frames with the second image data from the second image, to obtain the position for aiming at hot spot in the first image, and range-to-go is determined based on position of the hot spot in the first image is aimed at.

Description

It determines target range and the reading parameter of imaging reader is adjusted based on target range Arrangement and method

Cross reference to related applications

This application claims on Mays 26th, 2016 U.S. Patent Application Serial submitted No. 15/165,117 and 2016 6 Month U.S. Patent Application Serial submitted the 15/170,464th equity on the 1st.

Background technique

The present invention relates generally to a kind of arrangement and method, for determining in the range of operating distance to being caught by image The distance of the target of reading is obtained, and/or is promptly adjusted based on target range and can be used to lead in the range of operating distance One or more reading parameters that image capture reads the imaging reader of target are crossed, are especially had from image-forming assembly offset Aiming optical assembly imaging reader in.

Solid state imaging system or imaging reader have been used for hand-held and/or hands-free mode of operation and carry out electric light reading mesh Mark, such as a peacekeeping two-dimentional bar code symbol target and/or the is-not symbol target of such as document etc.Hand-held imaging reader packet Shell and image-forming module are included, shell has the handle held by operator, and image-forming module is also known as scanning engine, by the shell It supports and is aimed at during reading by operator.Image-forming module includes image-forming assembly and imaging lens arrangement, imaging group Part has the solid-state imager or imaging sensor of the imaging array with photovoltaic element (photocells) or optical sensor, the light The imaging array of electric unit or optical sensor corresponds to pictorial element or pixel in the imaging viewing field of imager, the imaging len Component is used to capture the return light from target scattering being imaged and/or reflection and for the return light to be projected the array On to start the capture to the image of target.Such imager may include one-dimensional or two-dimensional charge-couple equipment (CCD) or complementation Metal-oxide semiconductor (MOS) (CMOS) equipment and for generating and handling and the one-dimensional or two-dimensional pixel data in imaging viewing field The associated circuit of the corresponding electronic signal of array.In order to increase the return light captured by the array in for example dim environment Amount, image-forming module also typically include for be preferably by from target reflect and scatter illumination light variable level irradiate mesh Target illumination component.Aiming at optical assembly can also be supported by image-forming module, for projecting visible aiming hot spot in target.

In some applications, such as in warehouse, for identical reader sometimes for not only reading remote target (example Such as, on the product being located on the shelf for exceeding the crown, which, which is located at, is leaving 30 feet to 50 feet of reader amounts At the long distance operating distance range of grade) and need to read close target and (such as be located at ground level or Proximity operation person On product, which is positioned away from the close-up operation distance range of magnitude of the reader less than two feet).It can be in reader It is middle that nearly imager is provided, for being imaged and focusing on the close target in relatively wide imaging viewing field, and can also be same Distance imaging device is provided in one reader, for being imaged and focusing on the remote target in relatively narrow imaging viewing field.Typically, At least one imager (usually distance imaging device) in imager has variable focal length, such as movable lens component or zoom Element.

Although known imaging reader usually meets its expected purpose, reader is promptly selected correctly Imager reads target, is promptly that selected imager selects correct gain and/or exposure, and promptly selects Correct illumination level has challenge to irradiate the target that can be located at any position within the scope of the operating distance of extension. It is also to have challenge within the scope of the operating distance of extension that correct imager, which is focused on,.Consumer's camera on smart phone In the very common automatic focusing based on contrast be notoriously slow because it depend within the relatively long period Many images are captured and handled on many successive frames to determine best focus position.In desired quick acting, active and dynamic In many industrial applications of reader, this slow performance is unacceptable.

Therefore, it is necessary to promptly adjust the various reading parameters of imaging reader, correct imager, adjustment are such as selected The gain and/or exposure of at least one imager adjust illumination level and focus at least one imager, for reading It can be located relative to the target of any position of the imaging reader within the scope of the operating distance of extension, without slowing down or bad Change reader performance.

Detailed description of the invention

Attached drawing (wherein similar appended drawing reference indicates identical or functionally similar element in all individual views) This is included in together with following detailed description and forms part of specification, and is used to be further described including required guarantor The embodiment of the design of the invention of shield, and explain the various principles and advantage of those embodiments.

Fig. 1 is according to the side view of the portable hand-held imaging reader of the disclosure, which can be used to really Set the goal distance, for promptly selecting correct imager and/or imager gain and/or imager exposure and/or photograph Bright level, and/or promptly focus correct imager.

Fig. 2 is to include imaging on the image-forming module being supported in the reader for being mounted on Fig. 1, illumination and aim at light The schematic diagram of the various parts of component.

Fig. 3 is the perspective view of the image-forming module of Fig. 2 under isolated state.

Fig. 4 is the sectional view obtained on the line 4-4 of Fig. 2.

Fig. 5 is the view of the aiming spot in the close target described for the reader of Fig. 1.

Fig. 6 is the view of the aiming spot on the remote target described for the reader of Fig. 1.

Fig. 7 is the view during determining the position of aiming spot in the picture roughly comprising aiming at the image of spot.

Fig. 8 is the view during finely determining the position of aiming spot in the picture comprising aiming at the image of spot.

Fig. 9 is flow chart the step of execution in the method for describe the distance that sets the goal really according to the disclosure.

It will be appreciated by those skilled in the art that the element in attached drawing is shown for simplicity and clarity, and not necessarily to scale It draws.For example, the size of some elements in attached drawing and position can be amplified to help to improve to this hair relative to other element The understanding of bright embodiment.

Arrangement and method composition are indicated by the way that ordinary symbol is in place in the accompanying drawings, the expression is only It shows and understands those of the related specific detail of the embodiment of the present invention in order to avoid because having benefited from description herein to art technology The obvious details of personnel and obscure the disclosure.

Specific embodiment

An aspect of this disclosure is related to one kind will be read for determination in the range of operating distance by image capture The distance of the target taken and/or for adjust imaging reader at least one read parameter for the range in operating distance The interior arrangement that target is read by image capture.The arrangement includes: the aiming component that can be motivated, for when being motivated along taking aim at Fiducial axis is directed to target for hot spot is aimed at；And controller, for motivating and deactivating aiming component.The device further includes imaging Component for the first image of target of the capture comprising aiming at hot spot in the case where aiming at component and being motivated, and is used for Aim at the second image that the target without aiming at hot spot is captured in the case that component is de-energized.Frame of each image in visual field In be captured, the visual field have from aim at axle offset imaging axis.Image pre-processor is on the common score region of two frames The first image data from the first image is compared with the second image data from the second image, to obtain aiming light Position of the spot in the first image, and range-to-go is also determined based on position of the aiming hot spot in the first image.Control Device processed also can be used to adjust at least one reading parameter based on determining target range.

More specifically, common score region segmentation is multiple by image pre-processor during rough determining target range Subframe, and the first image data in more each subframe and the second image data aim at hot spot at least the one of subframe to obtain Position in a.Hereafter, it is fine determine target range during, image pre-processor is by the region around the position for aiming at hot spot Multiple subregions are subdivided into, and compare the first image data in each subregion and the second image data to obtain aiming hot spot Position at least one of subregion.Advantageously, image-forming assembly captures each image as the pixel with brightness value Array, and image pre-processor in each subframe and each subregion brightness value be averaging to obtain average brightness Value, and compare the difference between the average brightness value in each subframe and each subregion of the first image and the second image, with It is taken aim at based on the maximum difference between at least one subframe in subframe and subregion and the average brightness value of subregion The position of quasi-optical spot.

The arrangement is preferably incorporated in image-forming module (also referred to as scanning engine), which is mounted on imaging and reads In device (especially hand-held reader), there is the nearly imaging for close target to be imaged on relatively wide imaging viewing field Device and on relatively narrow imaging viewing field be imaged remote target distance imaging device.Image-forming assembly mentioned above is preferred Ground includes having pancratic distance imaging device, such as movable lens component or variable focal length element.Reader is preferably Illumination optical assembly with the variable level for generating illumination light.

According to the disclosure, identified target range can be used for adjusting the one or more of imaging reader and read parameter. For example, which can automatically select in imager to be used using identified target range come imageable target, and/or from The gain of selected imager is adjusted dynamicly, and/or automatically adjusts the exposure of selected imager, and/or automatically adjust Light level is illuminated, and/or automatically adjusts the focal length of selected imager.With by long period capture and processing permitted More images execute the known automatic focusing based on contrast on the contrary, focusing disclosed herein is rapider, because in a pair Performance objective determination of distance in the subframe of parts of images and in the subregion of subframe.

The yet other aspects of the disclosure are related to a kind of determination will be read in the range of operating distance by image capture The distance of the target taken and/or at least one for adjusting imaging reader read parameter for leading in the range of operating distance It crosses image capture and reads mesh calibration method.This method is directed to target along guidance axis by that will aim at hot spot, and will not then It aims at hot spot and is directed to target to execute.By capturing the first image of the target comprising aiming at hot spot, capture without aiming at light Second image of the target of spot, and each image is captured from the frame in the visual field of imaging axis for aiming at axle offset having Further execute this method.By on the common score region of two frames by from the first image the first image data and come It is compared from the second image data of the second image to obtain the position for aiming at hot spot in the first image, and by being based on It aims at hot spot and determines range-to-go in the position of the first image to go back and further execute this method.By based on determined by Target range adjusts at least one and reads parameter to further execute method.

Appended drawing reference 30 in Fig. 1 normally identifies the ergonomics imaging reader for being configured as pistol-shaped shell, The shell has top cylinder or main body 32 and leaves main body 32 to be retreated with the inclination angle for being for example 15 ° relative to vertical direction Oblique lower handle 28.Optical transmission window 26 is located at adjacent to the front end of main body 32 or nose and preferably also for example relative to vertical The oblique angle that direction is 15 °.Imaging reader 30 is held in the hand of operator and uses in a handheld mode, hand-held In mode, trigger 34 is manually pressed to initiate to target to be read in the operating distance range of extension (especially Bar code symbol) imaging, the operating distance range of the extension for example leaving about 30 feet of window 26 to 50 English The magnitude of ruler.The reader of the shell and operation of other configurations in the handsfree mode also may be utilized.

Meaning property shows and as more shown in Fig. 3-Fig. 4 as shown in Figure 2, and image-forming module 10 is installed in window And it can be used to the work across window 26 in the extension for leaving module 10 as described below in 26 subsequent readers 30 Make to read target by picture catching in the range of.Target can be located at close-up operation distance (WD1) and long distance working distance From any position in the operating distance range between (WD2).In a preferred embodiment, WD1 at window 26 or leaves window 26 about 18 inches, and to leave window 26 much farther away by WD2, such as leaving window 26 is more than about 60 inchs.Module 10 Including image-forming assembly, which has nearly imaging sensor or imager 12 and nearly imaging lens arrangement 16 and distance imaging Sensor or imager 14 and distance imaging lens subassembly 18, the nearly imaging lens arrangement 16 be used for it is generally rectangular relatively From the near zone of the range is located at (for example, from about zero English of window 26 is left on wide imaging viewing field 20 (for example, about 30 degree) Very little to about 18 inches of region) in close-target capture return light and project nearly imager for the return light that will be captured On 12, which is used in generally rectangular relatively narrow imaging viewing field 22 (for example, about 16 degree) It is returned from the remote target acquisition in the long-distance region (for example, the region for leaving greater than about 60 inches of window 26) for being located at the range Light simultaneously is used to the return light captured projecting distance imaging device 14.Although illustrated in Fig. 2 only two imagers 12, 14 and two imaging lens arrangements 16,18, it will be understood that, more than two imager can be provided within the module 10.

Each imager 12,14 is solid condition apparatus, such as with addressable image sensing of single linear row arrangement The CCD of the two-dimensional array of the one-dimensional array or the sensors with auxiliary electrode preferably arranged with mutually orthogonal row and column of device or pixel Or cmos imager, and the imager 12,14 can be operated to be captured for detecting by corresponding imaging lens arrangement 16,18 The return light that window 26 is passed through along corresponding nearly imaging axis 24 and distance imaging axis 36.Each imaging lens arrangement advantageously library Gram triplet.As illustrated in figure 4, nearly imaging lens arrangement 16 have fixed focal length, and distance imaging lens subassembly 18 by There is variable focal length in being added to zoom element 38 or movable lens component.

Also as shown in Fig. 2-Fig. 4, illumination optical assembly is also supported by image-forming module 10 and including being fixedly mounted in optical axis Lighting source (for example, at least one light emitting diode (LED) 40) on 42 and the also illuminating lens centered on optical axis 42 44 illuminating lens component.Illumination optical assembly is shared by two imagers 12,14, and can be used to variable illumination level Emit illumination light.

As further shown in Fig. 2-Fig. 3, aims at optical assembly and also supported by image-forming module 10 and including being fixedly mounted in Aiming light source 46 (for example, laser) on guidance axis 48, and the finder lens 50 centered on guidance axis 48.Finder lens 50 can To include diffraction or refraction optical element, and can be used to before reading throw it will be seen that aiming at light pattern along guidance axis 48 It is mapped in target.As shown in Fig. 5-Fig. 6, aiming at light pattern includes aiming at hot spot 102, it is therefore preferred to have generally round shape Shape.

As further shown in institute in Fig. 2, imager 12,14, LED 40 and laser 46 are operatively connectable to operate For controlling the controller or microprocessor by programming 52 of the operation of these components.Memory 54 is connected to controller 52 and can It is accessed by controller 52.Preferably, controller 52 with for handle the return light from target and be used for the target captured The device that image is decoded is identical.The specific integrated circuit (ASIC) or the figure in field programmable gate array (FPGA) of customization As preprocessor 56 is operatively coupled between imager 12,14 and controller 52, for pre-processing by imager 12,14 Captured image, as described more fully below.In some applications, image pre-processor 56 can be integrated with controller 52.

As described previously for reader 30, promptly select correct imager 12 or 14 read target, promptly for Selected imager select correct gain and/or exposure and selection the 40 correct illumination level from LED so as to Target from anywhere in irradiation can be located within the scope of the operating distance of extension has challenge.By selected imager Focus on is also to have challenge within the scope of the operating distance of extension.Dependent within the relatively long period on many successive frames It is notoriously slow that many images, which are captured and handled, with the automatic focusing based on contrast for determining best focus position.This public affairs The one aspect opened is related to not only being used as illumination photometer by operation aiming optical assembly but also is used as rangefinder to determine range-to-go, And correct imager 12 or 14 is then selected, and/or selection is used for the correct gain and/or exposure of selected imager Light, and/or select correctly to illuminate from LED 40, and/or based on the selected imager of identified Range Focusing, to enhance Reader performance.

As shown in Figure 2, guidance axis 48 deviates nearly imaging axis 24 and distance imaging axis 36, so that the aiming spot on guidance axis 48 Point 102 and the parallax closely generated between one of imaging axis 24 and distance imaging axis 36 provide target range information.More specifically, Guidance axis 48 and nearly parallax between any one of imaging axis 24 and distance imaging axis 36, which are provided, to be passed away from aiming spot 102 in imaging The range information of the location of pixels on one in sensor array.Preferably default the imaging axis 36 for using distance imaging device 14, Because parallax will be bigger than to nearly imager 12 to distance imaging device 14.In a preferred embodiment, on guidance axis 48 and module 10 The distance between distance imaging axis 36 be about 23 millimeters.

As shown in figure 5, the target for the symbol 100 being configured in the near zone of the range is included in distance imaging device 14 Narrow visual field 22 in, and preferably, imaging axis 36 is substantially centered in narrow visual field 22.As shown in fig. 6, being configured to be located at the model The same symbol 100 in the long-distance region enclosed is also contained in the narrow visual field 22 of distance imaging device 14, and preferably, imaging axis 36 It is substantially centered in narrow visual field 22 again.The apparent size of symbol 100 is bigger than in Fig. 6 in Fig. 5.In narrow imaging viewing field 22 In, symbol 100 deviates center in Fig. 5, and center is more in Fig. 6.For defaulting distance imaging device 14, if symbol 100 In at away from the unlimited operating distance of reader 30, then the aiming spot 102 being directed toward on symbol 100 will directly overlay imaging axis 36 On.As symbol 100 is increasingly closer to reader 30, the area for aiming at spot 102 is increasing, as shown in figure 5, and along It is mobile that inclined trajectory 104 leaves imaging axis 36.By determining the position for aiming at spot 102 relative to imaging axis 36 on track 104 It sets, can determine the operating distance of symbol 100.Aim at the interval between spot 102 and imaging axis 36 and the inverse of operating distance It is proportional.Preferably, during reader manufacture, calibration in advance aims at spot 102 along the position of track 104.Also such as Fig. 5-Fig. 6 Shown, distance imaging device 14 is with the image of specified resolution capture symbol 100, with height for 800 row pictures in the case where the diagram Plain width is the two-dimensional resolution of 1280 column pixels.

Image pre-processor 56 mentioned above aims at spot for analyzing by 14 captured image of distance imaging device, to determine The position of point 102.In order to make cost minimization, image pre-processor 56 is preferably incorporated in low-power, in reduction process equipment, excellent Selection of land does not have frame buffer to store image.As a result, as explained below, the not responsible analysis of image pre-processor 56 is each whole The captured image of body, but the score region of each captured image is only analyzed, it is especially wherein expected to aim at spot 102 The score region occurred along track 104.

More specifically, controller 52 motivates aiming laser device 46 to be directed on symbol 100 will aim at spot 102.Far at As device 14 captures first thereon with the symbol 100 for aiming at spot 102, entire or preferably part figure in the first frame Picture.In response, image pre-processor 56 only analyzes the score region of the first image in first frame.As shown in Figure 7, image Preprocessor 56 does not analyze pixel of the 0th row into the about the 400th row, or pixel or 0th column of the about the 560th row into the 800th row Pixel into the about the 640th column because aiming at spot 102 is not expected at there, and have no reason to waste processing capacity or Time analyze there is no aim at spot 102 pixel.Score region or remaining area include the original of complete first image Only about 160 row in 800 rows, and therefore can and analysis much more quickly more captured than complete first image.

The remaining area of first frame is subdivided into the matrix of subframe or rough region by image pre-processor 56.Such as institute in Fig. 7 Show, remaining area is subdivided into 16 subframes for being as general as rectangle, for example, four rows multiply four column.Subframe is not needed with phase Same height, width or area.It will be understood that remaining area can be subdivided into any number of subframe.The quantity of subframe depends on It initially will roughly aim at spot 102 and be located in desired precision in subframe.

Image pre-processor 56 is next from each acquisition image data in subframe.More specifically, in each subframe All pixels tone or brightness value be averaging to obtain average brightness value.The acquisition of image pre-processor 56 16 is average bright The matrix of angle value has an average brightness value for each subframe.

With that is, controller 52 deactivates aiming laser device 46, and distance imaging device 14 captures on it in the second frame Do not aim at the symbol 100 of spot 102 second, entire or preferably part image.As before, image pre-processor 56 only divides The score region of the second image in the second frame is analysed, and the score region is identical as score region used in the first image Score region.As before, image pre-processor 56 obtains the brightness value of all pixels in each subframe in identical score region, Brightness value in each subframe in identical score region is averaging to obtain average brightness value, and obtains 16 average brightness The matrix of value has an average brightness value for each subframe.

As non-limiting numerical example, the matrix of 16 average brightness values in the case where aiming at the currentless situation of component It is shown in following left side, and for example following right side of matrix of 16 average brightness values in the case where aiming at member actuation Shown in side:

Image pre-processor 56 compares two matrixes followed by the average brightness value subtracted each other for each subframe, from And the difference matrix of following luminance difference is obtained in the numerical example:

From difference matrix, it will be observed that, the luminance difference in the 1st row the 1st column is highlighted from every other luminance difference, Because it has amplitude peak or luminance difference.This identifies the position for aiming at spot 102.

If it is desire to more accurately determining the position for aiming at spot 102, then image pre-processor 56 can will aim at spot Region segmentation around 102 identification position is multiple subregions.As shown in figure 8, image pre-processor 56 is by the region segmentation For subregion or the matrix of refined area, for example, being divided into 16 (for example, four rows multiply four column) is as general as the sub-district of rectangle Domain.Subregion does not need height, width or area having the same.It will be understood that the region can be subdivided into any number of son Region.The quantity of subregion depends on that aiming spot 102 is subtly then located in desired precision in subregion.

As before, controller 52 makes aiming laser device 46 motivate and deactivate, and the acquisition of processor 56 16 is average bright The matrix (having an average brightness value for each subregion in the case where aiming laser device 46 is motivated) of angle value and Another matrix of 16 average brightness (has one for each subregion in the case where aiming laser device 46 is de-energized A average brightness value).Image pre-processor 56 compares two followed by the average brightness value subtracted each other for each subregion A matrix, and subtly positioned by finding the maximum luminance difference at least one of subregion and aim at spot 102.

Return to Fig. 7, it will be observed that do not need to analyze all 16 subframes, because edge will be only occurred in by aiming at spot 102 In the shade subframe that shows of track 104.A possibility which reduce the mistakes as caused by mobile object or stroboscopic light sources, the sudden strain of a muscle Radiant may only occur in the image in the case that aiming laser device 46 is motivated, and be erroneously interpreted as aiming at spot 102. The same principle for ignoring subframe can be applied to the top row and bottom line of subregion shown in fig. 8.

In operation, once the operating distance to symbol 100, controller 52 or selection has been determined from speckle displacement is aimed at Nearly imager 12, and when the symbol 100 that rangefinder determination will be imaged and be read by nearly imager 12 is located at the low coverage area of range When domain, excitation illumination optical assembly is with the illumination symbol 100 of relatively small intensity；Or selection distance imaging device 14, and And when the symbol 100 that rangefinder determination will be imaged and be read by distance imaging device 14 is located at the long-distance region of range, excitation illumination Optical assembly is with the illumination target of relatively large intensity.

In addition, the operating distance to symbol 100 once has been determined from aiming speckle displacement, controller 52 can also such as lead to The focal length of change concentrating element 38 is crossed to adjust the focal length of distance imaging device 14.Controller 52 motivates LED 40 to change with variable current Become the intensity of illumination light.Further, once the operating distance and/or one to symbol 100 has been determined from speckle displacement is aimed at Denier has determined that the brightness value from each subframe, controller 52 can also adjust the gain and/or exposure of one or more imagers Light.

As shown in the flow chart of Fig. 9, this method is executed by following steps: excitation aims at optical assembly in step 200 To be directed to symbol 100 for hot spot 102 is aimed at along guidance axis；Symbol of the capture comprising aiming at hot spot 102 in step 202 100 the first score image；And the first image data is obtained from the first score image in step 204.Then, in step Make to aim at optical assembly deactivation in 206, captures the second score chart of the symbol 100 without aiming at hot spot 102 in a step 208 Picture, and the second image data from the second score image is obtained in step 210.Compare the first image in the step 212 Data and the second image data aim at the position of hot spot 102 to obtain, and in step 214 based on the aiming hot spot 102 Position determines the distance to symbol 100.In the step 216, based on identified distance, correct imager 12 or 14 is selected, And/or adjustment is used for the correct gain and/or exposure of selected imager, and/or correct illumination of the adjustment from LED 40, And/or the focal length of the selected imager of adjustment.

Specific embodiment has been described in the above specification.However, those of ordinary skill in the art understand, can make The scope of the present invention that various modifications and change are illustrated without departing from following claims.Therefore, the description and the appended drawings quilt It is considered exemplifying and non-limiting meaning, and all this modifications are intended to be included in the range of this introduction.

These benefits, advantage, issue-resolution and any benefit, advantage or solution may be made to occur or become (multiple) any elements more outstanding are not construed as the key of any or all claim, required or necessary spy Sign or element.The present invention is individually defined by the appended claims, and is appointed including what is made during the application is in pending status All equivalents of these claims after what is modified and publishes.

In addition, in the document, such as first and second, the relational terms of top and bottom or the like can individually be used to One entity or movement are differentiated with another entity or movement, and not necessarily requires or implies between these entities or movement With any actual this relationship or sequence.Term " composition ", " composition has ", " having ", " having ", " comprising ", " including Have ", "comprising", " containing " or their any other modification be intended to cover nonexcludability include so that constituting, having, wrapping Include, process, method, article or the device of list comprising element not only include those elements, may also include to this process, side Method, article or the not expressly listed or intrinsic other element of device.With " composition has one ", " having one ", " including one " or " packet Element containing one " beginning, in the case of no more multi-constraint condition, however not excluded that constituting, having including or comprising the element Process, method, in article or device with the presence of other identical element.Term " one " and "one" be defined as one or more It is multiple, unless explicitly stated otherwise herein.Term " substantially ", " substantially ", " approximation ", " about " or these terms are appointed What his version is defined as understanding close to those of ordinary skill in the art, and in a nonlimiting examples In, which is defined as within 10%, is defined as within 5% in another embodiment, defines in another embodiment To be defined as within 0.5% within 1%, and in another embodiment.Term " coupling " used herein is defined For connection, although be not necessarily be directly connected to be also not necessarily mechanical connection.In some way " configuration " equipment or Structure is at least configured in this way, but can also be configured in ways that are not listed.

It will be understood that some embodiments may include such as microprocessor, digital signal processor, the processor of customization and scene The general or specialized processor (or " processing equipment ") of one or more of programmable gate array (FPGA) etc and unique storage Program instruction (including both software and firmware), it is described uniquely store program instruction control one or more processors with even Some, the most or repertoire of approach described herein and/or device is realized with certain non-processors.Alternatively, Some or all functions can realize by the state machine without storage program instruction, or in one or more specific integrated circuits (ASIC) it is realized in, wherein certain combinations of various functions or certain functions are implemented as customized logic.Certainly, it is possible to use this The combination of two methods.

In addition, one embodiment can be implemented as computer readable storage medium, which has The computer-readable code being stored thereon, for being executed to (for example including processor) computer programming as retouched herein It states and claimed method.The example of this computer readable storage medium includes but is not limited to hard disk, CD-ROM, optical storage Device, magnetic memory device, ROM (read-only memory), PROM (programmable read only memory), (erasable programmable is read-only by EPROM Memory), EEPROM (electrically erasable programmable read-only memory) and flash memory.Additionally, it is contemplated that those of ordinary skill in the art Although being made that by such as pot life, current techniques and economic consideration and the possible significant effort actuated and many designs Selection, but when being instructed by concepts disclosed herein and principle, easily such software can will be generated by least testing Instruction and program and integrated circuit (IC).

The abstract of the disclosure is provided to allow reader's rapidly clear the nature of the disclosure of the art.The abstract is submitted, and Understand that the abstract will not be used to interpret or limit the range or meaning of claims.In addition, in above-mentioned specific embodiment, It can be seen that each feature is grouped into together in embodiments for the purpose for making disclosure integration.This disclosure side Method is not necessarily to be construed as reflecting that claimed embodiment needs more spies compared with being expressly recited in every claim The intention of sign.On the contrary, as the following claims reflect, subject matter is all special less than single disclosed embodiment Sign.Therefore, thus following following claims, which is incorporated into, illustrates, wherein each claim is as individually claimed Theme represents its own.

Claims (18)

1. a kind of arrangement for the determining distance to the target that pass through image capture reading in the range of operating distance, institute Stating arrangement includes:

The aiming component that can be motivated, hot spot will be aimed at when being motivated by, which being configured as, is directed to target along guidance axis；

Controller is configured as motivating and deactivating the aiming component that can be motivated；

Image-forming assembly is configured as

The first of the target of the capture comprising the aiming hot spot in the case where the aiming component that can be motivated is motivated Image, and

It is described can the aimings component of excitation be de-energized in the case where capture no aiming hot spot the target the Two images, each of the first image and second image are in the visual field with the imaging axis for deviateing the guidance axis Respective frame in be captured；And

Image pre-processor is configured as

On the common score region of each frame in the respective frame by from the first image the first image data with The second image data from second image is compared, to obtain position of the aiming hot spot in the first image It sets, and

The distance to the target is determined based on position of the aiming hot spot in the first image.

2. arrangement according to claim 1, wherein the common score region segmentation is more by described image preprocessor A subframe, and the first image data in each subframe of more the multiple subframe and second image data with Obtain position of the aiming hot spot at least one subframe in the multiple subframe.

3. arrangement according to claim 2, wherein described image preprocessor will be around the position that aim at hot spot Region segmentation is multiple subregions, and the first image data in each subframe of more the multiple subframe and described the Two image datas are to obtain position of the aiming hot spot at least one subregion in the multiple subregion.

4. arrangement according to claim 2, wherein the image-forming assembly capture the first image and second image In array of each image as the pixel with brightness value, and wherein described image preprocessor is configured as

The brightness value in each subframe in the multiple subframe is averaging to obtain average brightness value, and

Compare each subframe in multiple subframes of the first image the average brightness value and second image it is more Difference between the average brightness value of each subframe in a subframe, based at least one of the multiple subframe The maximum difference between the average brightness value in frame obtains the position for aiming at hot spot.

5. arrangement according to claim 1, wherein aiming component, the image-forming assembly and the figure that can be motivated As preprocessor is incorporated in image-forming module, the image-forming module has the first imager, and first imager is configured as First object is imaged on the first imaging viewing field；And second imager, second imager are configured as in the second imaging Be imaged the second target in visual field, the first object be positioned to than second target it is closer, described in the first visual field ratio Second visual field is wide, and wherein the image-forming assembly is that have pancratic second imager.

6. arrangement according to claim 5, wherein the controller adjusts described based on identified target range The focal length of two imagers.

7. arrangement according to claim 5, wherein the controller selects first imager and second imaging An imager in device, and based on identified target range, adjustment is used for the gain and exposure of selected imager At least one of.

8. arrangement according to claim 5 further includes the illumination optical assembly being mounted in the module, the illumination light group Part is configurable to generate the variable level of illumination light, wherein the controller adjusts the illumination based on identified target range The level of light.

9. arrangement according to claim 1, can also operate at least one for adjusting imaging reader read parameter with In reading target, wherein the controller is additionally configured to adjust the institute of the imaging reader based on identified target range It states at least one and reads parameter.

10. a kind of determination in the range of operating distance will by image capture read target distance method, it is described Method the following steps are included:

Hot spot will be aimed at and be directed to the target along guidance axis；

First image of the capture comprising the target for aiming at hot spot；

Then the aiming hot spot target is not directed toward；

The second image of no target for aiming at hot spot is captured, it is every in the first image and second image A image is captured in the respective frame in the visual field with the imaging axis for deviateing the guidance axis；

On the common score region of each frame in the respective frame by from the first image the first image data with The second image data from second image is compared, to obtain position of the aiming hot spot in the first image It sets；And

The distance to the target is determined based on position of the aiming hot spot in the first image.

11. according to the method described in claim 10, further comprise by the common score region segmentation be multiple subframes, and And the first image data in each subframe of more the multiple subframe and second image data are described to obtain Aim at position of the hot spot at least one subframe in the multiple subframe.

12. further comprising according to the method for claim 11, by the region segmentation around the position for aiming at hot spot For multiple subregions, and the first image data and second image in each subframe of more the multiple subframe Data are to obtain position of the aiming hot spot at least one subregion in the multiple subregion.

13. according to the method for claim 11, wherein capture the first image and capture second image lead to respectively Following steps are crossed to execute: each image in capture the first image and second image is as the picture with brightness value The array of element is averaging the brightness value in each subframe of the multiple subframe to obtain average brightness value, and compares It is described more compared with the average brightness value of each subframe of the multiple subframe of the first image and second image Difference between the average brightness value of each subframe of a subframe is come based at least one subframe in the multiple subframe In the average brightness value between maximum difference come obtain it is described aim at hot spot the position.

14. according to the method described in claim 10, wherein, first object is imaged on the first imaging viewing field by being configured as The first imager and an imager being configured as in the second imager that the second target is imaged on the second imaging viewing field It at least one of captures the first image to execute and captures described second image, the first object is than second mesh Mark is positioned to closer, and first visual field is wider than second visual field, wherein first imager and second imaging Device has variable focal length.

15. further comprising according to the method for claim 14, adjusting described second based on identified target range The focal length of imager.

16. according to the method for claim 14, further comprising selecting first imager and second imager In an imager, and based on identified target range, adjustment is in the gain and exposure of selected imager At least one.

17. the method according to claim 11 further comprises the variable level irradiation target with illumination light, and The level of the illumination light is adjusted based on identified target range.

18. according to the method described in claim 10, further operable for adjusting at least one reading of imaging reader Parameter is with for reading target, the method further includes adjusting the imaging reader based on identified target range At least one described reading parameter.