CN202870848U - 基于数字成像的图形标记识别系统 - Google Patents

基于数字成像的图形标记识别系统 Download PDF

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CN202870848U
CN202870848U CN2011205647700U CN201120564770U CN202870848U CN 202870848 U CN202870848 U CN 202870848U CN 2011205647700 U CN2011205647700 U CN 2011205647700U CN 201120564770 U CN201120564770 U CN 201120564770U CN 202870848 U CN202870848 U CN 202870848U
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S·P·基尔尼
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Abstract

本实用新型公开了一种基于数字成像的图形标记识别系统，该系统包括：自动手指指向触发操作模式；具有光传输孔的壳体；设置在所述壳体中的图像形成和检测子系统；设置在所述壳体中的照明子系统；设置在所述壳体中的图像捕捉和缓冲子系统；以及数字图像处理子系统。一种在诸如但不限于码符号选单之类的对象上读取包括码符号在内的图形标记的基于数字成像的系统和方法，其是通过用户简单地将他的或她的手指指向要读取的码符号选单上的特定码符号，而自动捕捉、缓冲和处理该码符号选单和指向手指的数字图像的。

Description

基于数字成像的图形标记识别系统
技术领域
本公开内容涉及数字成像系统，其具有智能地处理一维(1D)和二维(2D)条形码符号数字图像的模式，来执行先进系统功能和满足特别在销售点(point of sale，POS)环境处的苛求的端用户应用需求。 
背景技术
存在在各种应用环境中对条形码选单进行扫描的增长的需要。 
例如，可以发现在超市的接收区中使用条形码选单。在那里，苏打供应商提供一片材/选单产品条形码，接收器必须对该产品条形码进行扫描以便将产品输入到库存中。每个条形码必须被单独地扫描，并且不是该片材上的所有条形码都需要被扫描。 
典型地，基于激光的条形码扫描器生成窄的光平面以帮助用户指向并瞄准条形码选单上感兴趣的条形码。然而，基于数字成像的产品典型地捕捉选单上整个条形码页面，在单个数字图像内，这使得基于用户的意图针对在手边的应用应当扫描哪个(哪些)条形码是不确定的。 
目前，此问题的唯一解决方案是分析所捕捉的条形码选单的数字图像的中心之内的窄的感兴趣区域(region of interest，ROI)。典型地，这使用辅助用户把感兴趣的条形码居中在数字成像器的视场中心之内的瞄准模式来达到。此技术要求协调该窄光束和预期要读取的条形码，当必须从相同条形码选单读取多个条形码时，这可能是困难且耗时的。 
因此，在本领域存在对用于使用避免现有技术装置和方法的缺点和弊端的数字图像捕捉和处理技术来读取诸如条形码符号选单之类的对象上的条形码符号的改进方法和装置的强烈需要。 
实用新型内容
因此，本公开内容的主要目的是提供一种使用先进图像捕捉和处理技术来 使得在条形码选单上能够实现对1D和2D条形码符号体系的选择和读取的新颖方法和装置，其避免了现有技术装置和方法的缺点和弊端。 
在一个方面，本公开提供了一种基于数字成像的图形标记识别系统，包括： 
自动手指指向触发操作模式； 
具有光传输孔的壳体； 
设置在所述壳体中的图像形成和检测子系统，其具有图像形成光学器件，用来在对象照明和成像操作期间，产生视场并将其投射通过所述光传输孔并且到区域型图像检测阵列上，所述区域型图像检测阵列用于检测存在于所述视场内的对象的2D数字图像； 
设置在所述壳体中的照明子系统，其包括照明阵列，用来在所述视场内产生照明场，并且对在所述视场内检测到的所述对象进行照明，使得所述照明反射离开所述对象并且向回传输通过所述光传输孔并且到所述图像检测阵列上以形成所述对象的所述2D数字图像； 
设置在所述壳体中的图像捕捉和缓冲子系统，用来捕捉和缓冲由所述图像形成和检测子系统检测到的2D数字图像；和 
数字图像处理子系统，用来在所述自动手指指向触发操作模式期间，处理由所述图像捕捉和缓冲子系统捕捉和缓冲的所述一个或多个2D数字图像，以及读取表示于其中的1D和2D码符号； 
其中所述数字图像处理子系统包括指向手指识别和移动检测模块，用来自动处理由所述图像捕捉和缓冲子系统缓冲的所捕捉数字图像，并且支持所述自动手指指向触发操作模式所需的图像处理操作，包括自动检测(i)用户的指向手指的存在，以及(ii)所述手指正指向的感兴趣区域，因此能够处理所述感兴趣区域中的像素以便读取由在所述感兴趣区域中包含的像素图形表示的图形标记项。 
该基于数字成像的图形标记识别系统还包括：输入/输出子系统，其被设置在所述壳体中，用来把经处理的图形数据输出到外部主机系统或其他信息接收或响应设备；和系统控制子系统，其被设置在所述壳体中，用来在对象检测、照明和成像操作期间控制和/或协调所述子系统。 
所述照明子系统包括LED阵列。 
另一目的是提供一种具有条形码符号读取模式的新颖数字成像系统，当用 户简单地将他的或她的手指指向条形码符号选单上他或她预期要读取的特定条形码符号时，该条形码符号读取模式允许用户确定在印刷条形码选单上该系统应当自动读取哪个条形码符号。 
另一目的是提供一种数字成像系统，其中用户使用他的或她的手指指向印刷条形码选单片材上的特定条形码，通过捕捉和处理该条形码选单存在于其中的系统的视场(field of view，FOV)的一个或多个数字图像，用户预期要以自动方式读取该特定条形码。 
另一目的是提供一种数字成像系统，其中用户使用他的/她的手指指向条形码选单片材上的感兴趣区域，而捕捉、缓冲并处理包括用户指向选单片材上的条形码符号的手指在内的对象的数字图像以便自动读取包含在用户的手指指向的感兴趣区域中的条形码符号或其他图形标记。 
另一目的是提供一种在条形码符号选单上读取符号的方法和数字成像系统，其采用在用户用他的或她的手指简单地指向感兴趣的条形码符号时捕捉和处理整个条形码符号选单的数字图像，并且数字图像处理器自动地把该指向手指标识为在所捕捉数字图像内的对象，定位邻近所检测指向手指的感兴趣区域(ROI)的坐标，以及对包含在该ROI中的像素数据进行解码处理以便读取定位在与接近于该ROI的所检测指向手指邻近的条形码符号。 
本实用新型的另一目的是提供一种用于在条形码选单上读取条形码符号的方法和数字成像系统，其中当条形码符号选单片材被呈现在该数字成像系统的桌面上时，则用户仅仅需要将他的或她的手指指向他或她希望读取的每一个条形码。 
本实用新型的另一目的是提供一种用于读取条形码符号的方法和数字成像系统，其中该系统自动检测用户的指向手指的移动的任何暂停，并且响应于此，而自动检测所检测手指正指向的感兴趣区域(ROI)，并尝试对在包含于其中的像素中图形表示的一个或多个条形码符号进行解码。 
本实用新型的另一目的是提供一种用于读取条形码符号的方法和数字成像系统，其中在读取用户将他的或她的手指指向的感兴趣区域(ROI)中的第一条形码符号之后，该系统自动检测该视场中该指向手指的移动，然后自动地重新尝试读取该指向手指指向的另一感兴趣区域中的另一条形码符号。 
本实用新型的另一目的是提供一种用于读取条形码符号的方法和数字成 像系统，其可以被用在呈现操作模式下，在该呈现操作模式下，条形码选单片材被放在该系统的视场(FOV)内在桌或台面表面上，并且用户简单地指向该片材上要自动读取的条形码。 
利用本实用新型的基于数字成像的图形标记识别系统，会更容易且成本有效地基于用户的意图针对在手边的应用应当扫描哪个(哪些)条形码 
附图说明
为了更完全的理解如何实现上述目的，应结合下面简要地描述的附图来阅读对说明性实施例的下列详细说明。 
图1是本公开内容的可手/台面支持的基于数字成像的条形码符号读取系统的说明性实施例的透视图，其中，在其自动对象检测子系统自动检测到在其视场(FOV)内存在对象(例如条形码选单)时，其基于LED的照明子系统对该FOV内的对象进行照明，而其图像形成和检测子系统形成和检测该对象的一个或多个数字图像，而其数字图像处理子系统自动处理数字图像并检测用户指向接近于该指向手指的感兴趣区域(ROI)的手指的存在，因此能够对此ROI中的像素数据进行自动解码处理使得在其中图形表示的任何条形码符号将被读取，以及对应的符号字符数据被生成以便传输到主机计算系统且被该主机计算系统使用。 
图2A是图1中所图示的说明性实施例的数字成像系统的第一透视分解图，示出了被布置在该系统壳体的前部分和后部分之间的其PC板组件，其中通过轴结构的方式铰接的基座枢轴地连接到该系统壳体的后部分。 
图2B是图1中所示的说明性实施例的数字成像系统的第二透视/分解图； 
图3是表示图1至2B中所图示的可手持数字成像系统的系统设计的示意框图，示出了其主要系统部件； 
图4A和4C是图1的数字成像系统的透视图，其被显示成对承载印刷在基板上的多个条形码符号的条形码选单进行成像，而用户正指向要被自动选择且由该系统读取的特定条形码符号； 
图4B和4D是图4A中所图示的条形码选单的扩展透视图，示出了用户正指向该条形码选单上他或她预期要被数字成像系统自动读取的特定条形码符号；以及 
图5A和5B和5C阐述了阐述在图1中所示出的数字成像系统的条形码符号读取模式期间所支持的实现手指指引的条形码符号读取过程中所涉及的步骤的流程图。 
具体实施方式
参考附图中的图，将更加详细地描述该数字成像系统的说明性实施例，其中使用同样的附图标记来指示同样的元素。 
现在参考图1至2B，将详细地描述数字成像条形码符号读取系统1的说明性实施例。 
总的来说，该说明性实施例1的数字成像系统能够通过下列方法来读取条形码选单上的一个或多个条形码符号：该方法简单地涉及用户指向预期要读取的条形码符号，而捕捉视场(FOV)内对象的数字图像，而无需激励在常规系统中使用的手动激励的触发开关。 
如图1、2及2B中所示出的，说明性实施例1的数字成像系统包括：可手/台面支持的壳体2，其具有(i)前部壳体部分2B，所述前部壳体部分2B具有窗口孔6和安装在其中的成像窗口面板3，以及(ii)后部壳体部分2A。如所示出的，基于单个PC板的光具座8(具有安装于其上的光学子组件)被支持在前部壳体部分2B和后部壳体部分2A之间，当把前部壳体部分2B和后部壳体部分2A合拢在一起时，形成组装单元。基座部分4通过枢轴结构131的方式连接到该组装单元，该枢轴结构131穿过成像器壳体的底部部分和基座部分以使得可手持壳体和基座部分能够相对于彼此转动。主机/成像器接口电缆10穿过形成在后部壳体部分的后部中的口132，并与安装在PC板8上的连接器相接。 
总的来说，基于数字成像的系统1可以在可手持操作模式和可台面支持操作模式这二者下使用。 
当在其可手持操作模式下操作时，该系统1支持若干不同的操作模式，即：(i)条形码符号读取操作的手动触发模式；(ii)条形码符号读取操作的自动触发模式；以及(iii)和条形码符号读取操作的自动手指指向触发模式。 
在手动触发操作模式下，用户如图4A中所示拿起该系统1，并在承载码符号的对象附近移动该系统，并且自动检测该对象，这促使跨越该FOV生成可见瞄准射束，并且当该瞄准照明射束与条形码符号对准时，用户按压开关5以手 动促使用基于LED的照明来照明该FOV中的对象，而其一个或多个数字图像(在单帧采集或视频模式下)被捕捉，并且被缓冲和处理以致力于读取该条形码符号。在共同未决的美国公开号20080314985 A1中详细描述了条形码符号读取操作的手动触发模式，该美国公开号20080314985 A1通过引用将其全部内容结合于此。 
在条形码符号读取操作的自动手指指向触发模式期间，用户如图4B和4D中所示拿起该系统1，并且在承载码符号的对象附近移动该系统。该对象被自动检测，这促使用基于LED的照明来照明该FOV中的对象，而其数字图像在视频模式下被捕捉，并且被缓冲和处理以致力于检测，如图4中所示，(i)用户的指向手指的存在，以及(ii)该手指正指向的感兴趣区域(ROI)，使得能够处理该ROI区域中的像素以便读取由包含在该ROI中的像素数据图形表示的条形码符号。在下文中参考图5A至5C中所示出的流程图，将更加详细地描述条形码符号读取操作的此自动手指指向触发模式。 
当在其可台面支持操作模式下操作时，该系统1支持条形码符号读取操作的自动触发模式，并且条形码符号读取操作的自动手指指向触发模式允许完全免提式操作。 
在自动触发操作模式期间，用户把对象(即条形码符号选单)呈现在该系统的FOV内，并且自动检测该对象，这促使用基于LED的照明对该FOV中的该对象进行照明，而其数字图像在视频模式下被捕捉，并且被缓冲和处理以致力于读取该条形码符号。 
在图4C中所图示的条形码符号读取操作的自动手指指向触发模式期间，用户把对象(即条形码符号选单)呈现在该系统的FOV内。自动检测该对象，这促使用基于LED的照明来照明该FOV中的对象，而其数字图像在视频模式下持续地(即定期地)被捕捉，并且被缓冲和处理以致力于检测，如图4D中所示出的，(i)用户的指向手指的存在，以及(ii)该手指正指向的感兴趣区域(ROI)，因此能够处理该ROI区域中的像素以便读取由包含在该ROI中的像素数据图形表示的条形码符号。在下文中参考图5A至5C中所示出的流程图，将更加详细地描述条形码符号读取操作的此自动手指指向触发模式。 
如图3中所示，基于数字成像的码符号读取系统1包括多个子系统部件，即：图像形成和检测(即相机)子系统21，其具有用于在要成像的对象上产生 视场(FOV)的图像形成(相机)光学器件34和CMOS或类似的区域型图像检测阵列35，其用于在照明操作期间在图像捕捉模式下检测反射离开该对象的成像光，在该图像捕捉模式下在该图像检测阵列上至少多个像素行被使能；基于LED的照明子系统22，其采用用来在图像形成和检测子系统21的整个FOV 33内产生窄带宽区域照明场126的单个LED照明阵列32，其从被照明对象反射并传输通过被实现在可手持数字成像系统内的窄带传输型光学滤波器40，并且被图像检测阵列35检测到，而所有其他周围光分量基本上被抑制；如在上文中所描述的对象瞄准照明系统31；用于在图像形成和检测子系统21的FOV内产生基于IR的对象检测场32的基于IR的对象运动检测和分析子系统20；用于控制基于LED的照明子系统22的操作的自动曝光测量和照明控制子系统24；用于捕捉和缓冲由图像形成和检测子系统21检测的2D图像的图像捕捉和缓冲子系统25；用于处理由图像捕捉和缓冲子系统25捕捉和缓冲的2D数字图像以及读取表示于其中的1D和/或2D的条形码符号的数字图像处理子系统26(具有指向手指识别和定位移动模块26A)；以及用于把经处理的图像数据等等输出到外部主机系统或其他信息接收或响应设备的输入/输出子系统27；以及与上面子系统集成的系统控制子系统30，用来在系统操作期间控制和/或协调这些子系统。 
对象瞄准子系统31的主要功能是，响应于或者(i)在系统操作的手持式成像模式期间对对象的自动检测，或者(ii)由操作者当他/她手动激励可手动激励触发开关5时对对象的手动检测，而自动生成可见线性瞄准照明射束70并跨越该系统的FOV的中央范围对其进行投射。为了实施该对象瞄准子系统31，OCS组件78还包括用于在一对孔槽之上支持该对射束折叠式反射镜的第四支持结构(未示出)。进而，这些孔槽被设置在被布置在FOV光学器件34的相对地点上的一对可见LED之上，以便生成线性可见瞄准射束70，该线性可见瞄准射束70被投射离开第二折叠式FOV 75并投射出该成像窗口3。此布置在美国专利公开号US20080314985 A1中被非常详细地描述和示出了，该美国专利公开号US20080314985 A1通过引用将其全部内部结合于此。 
对象运动检测和分析子系统20的主要功能是在图像形成和检测子系统21的FOV 33内自动产生对象检测场32、在该对象检测场32的预定区域内检测对象的存在以及有关在其内的该对象的运动和速度信息、和生成提供给该系统控制子系统30的用于指示在该系统的对象检测场内何时和何处检测该对象的控制 信号。如图2B中所示，IR LED 90A和IR光电二极管90B被支持在光学不透明结构133的中央偏低部分中，在线性LED阵列23之下。IR LED 90A和IR光电二极管90B被用来实施基于IR的自动对象运动检测和分析子系统20，如在前的美国专利公开号20080314985 A1中所教导的。 
图像形成和检测(即相机)子系统21包括用于在要成像的对象上提供视场(FOV)33的图像形成(相机)光学器件34，以及用于在照明和图像获取/捕捉操作期间检测反射离开该对象的成像光的CMOS区域型图像检测阵列35。 
基于LED的照明子系统22的主要功能是当在该FOV内自动检测对象时，从LED阵列23产生宽区域照明场36。特别地，分别在照明和成像模式期间，该照明场具有窄的光学带宽并且在空间上被限制在该图像形成和检测子系统21的FOV内。此布置被设计成以确保从照明子系统22发射且被反射离开被照明对象的仅仅窄带照明最终被传输通过该系统内的窄带传输型光学滤波器子系统40，并到达用于检测和处理的CMOS区域型图像检测阵列35，而由该光收集光学器件收集的所有其他周围光分量基本上在该图像检测阵列35处被抑制。这提供了改进的SNR，因而改进了该系统的性能。 
窄带传输型光学滤波器子系统40由下列来实现：(1)被包括在成像窗口3内的高通(即红波长反射)滤波器元件，以及(2)或者安装在CMOS区域型图像检测阵列35之前，或者安装在超过该高通滤波器元件的任何地方的低通滤波器元件，包括被实现为在折叠式反射镜74和75中的至少一个上支持的分色镜膜，如图2A和2B中所示。 
如图2B中所示，线性LED阵列23与包括或集成在该成像窗口3上边缘内的照明聚焦透镜结构130对准。而且，形成在PC板8中的光传输孔60在形成于前部壳体部分2A中的成像窗口3内在空间上被对准。照明聚焦透镜结构130的功能是对来自单个线性LED阵列23的照明进行聚焦，并对位于该系统的FOV的工作距离内任何地方的对象进行均匀地照明。 
如图2B中所示，光学不透明光射线包含结构133被安装到PC板8的前部表面，在线性LED阵列23周围。该光学不透明光射线包含结构133的功能是防止光射线从LED传输到除了该照明聚焦透镜面板3的后部输入表面之外的任何表面，其遍及其工作范围均匀地照明该系统的整个FOV。 
当把该前部壳体面板2B和后部壳体面板2A接合在一起时，其中PC板8被 设置在它们之间，照明聚焦透镜面板3位于形成在侧面板上的顶部表面的倾斜切掉物(cut-aways)内，并且从线性LED阵列23产生的照明射线或者被引导通过该照明聚焦透镜面板3的后部表面，或者被该结构133的涂以黑色的内表面吸收。 
如图2A和2B中所示，光学部件支持(optical component support，OCS)组件78包括：用于支持在该FOV形成光学器件之上的FOV折叠式反射镜74的第一倾斜面板，和用于支持在光传输孔60之上的第二FOV折叠式发射镜75的第二倾斜面板。在此布置的情况下，在该图像形成和检测子系统21中被采用并且源于被支持在PC板后部侧的光学器件的FOV在空间上被折叠两次，然后被投射通过光传输孔并且到该系统的成像窗口外面。 
自动曝光测量和照明控制子系统24执行两个主要功能：(1)实时测量在关于其图像检测阵列35处由该系统的光学器件收集的光子能量(即光)的功率密度(焦耳/厘米)，和生成指示良好图像形成和检测所需的曝光量的自动曝光控制信号；以及(2)与该系统控制子系统30所提供的照明阵列选择控制信号结合地，来自动驱动和控制照明子系统22中的LED阵列23的输出功率，使得该系统的FOV内的对象被最佳地暴露给基于LED的照明，并且在图像检测阵列35处形成和检测到最佳图像。该OCS组件78还包括用于支持在自动曝光测量和照明控制子系统24中采用的抛物线集光镜段79的第三支持面板。使用此反射镜78，窄光收集FOV被投射出到该图像形成和检测子系统21的宽区域FOV 33的中央部分中，并且将收集的光聚焦到光检测器81上，其独立于在图3中由附图标记35示意性地描绘的区域型图像感测阵列而操作。 
图像捕捉和缓冲子系统25的主要功能是(1)通过该系统的图像形成光学器件34检测聚焦到2D图像检测阵列35上的整个2D图像，(2)或者针对所捕捉图像帧的所选感兴趣区域，或者针对整个所检测图像生成数字像素数据帧，然后(3)缓冲如它捕捉的每个图像数据帧。特别地，在说明性实施例中，该系统支持单次激发和视频成像模式这二者。在单次激发模式下，在每个图像捕捉和处理周期期间或者在处理周期的特定阶段期间捕捉单个2D图像帧(31)。在视频成像模式下，其被用来支持图5A至5C中所图示的新颖手指指向触发模式，该系统在该FOV内持续捕捉对象的数字图像帧，以便对其进行随后处理。在美国专利公开号US20080314985 A1中更加详细地规定了这些模式，该美国专利公 开号US20080314985 A1通过引用将其全部内容结合于此。 
数字图像处理子系统26的主要功能是在照明和操作模式期间，处理已经由该图像捕捉和缓冲子系统25捕捉和缓冲的数字图像。这样的图像处理操作包括如在美国专利No.7,128,266中所描述的基于成像的条形码解码方法，该美国专利No.7,128,266通过引用结合于此。 
输入/输出子系统27的主要功能是支持与外部主机系统和设备的通用的、标准的和/或专用的数据通信接口，并且通过这样的接口的方式把经处理的图像数据等等输出到这样的外部主机系统或设备。这样的接口的示例以及用于实现其的技术，在美国专利No.6,619,549和6,619,549中给出，所述美国专利No.6,619,549和6,619,549通过引用将其全部内容结合于此。 
系统控制子系统30的主要功能是向该系统内如所示出的每个子系统部件提供某预定度的控制、协调和/或管理信令服务。虽然此子系统可以通过编程的微处理器来实现，但是在本实用新型的优选实施例中，此子系统通过在图3和13中所示出的微计算平台上支持的三层软件架构来实现，并且该三层软件架构在美国专利No.7,128,266以及在下文中其他地方予以描述。 
与该壳体集成的手动可激活触发开关5的主要功能是，在手动触发操作模式期间，使得用户在手动按压其(即促使触发事件)时能够生成控制激活信号(即触发事件信号)，和把此控制激活信号提供给系统控制子系统30以供在实施如本文详细地描述的其复杂系统和子系统控制操作时使用。 
系统存储器中的系统配置参数表29的主要功能是针对可用特征和功能性中的每一个，以及可编程的支持系统操作模式，存储(在非易失性/持久性存储器中)一组系统配置和控制参数(即SCP)，并且在其复杂操作期间，根据需要该组系统配置和控制参数可以由系统控制子系统30自动读取和使用。特别地，这样的SCP可以如在共同未决的美国公开号20080314985 A1中非常详细地教导的那样被动态管理，该美国公开号20080314985 A1通过引用结合于此。 
由图像处理子系统26支持的、基于成像的手指指向模块26A的主要功能，是自动处理由图像捕捉和缓冲子系统25缓冲的所捕捉数字图像，和支持图5A至5C的流程图中所描述的图像处理操作，其是在子系统30的控制下实施的。 
采用说明性实施例的基于数字成像的条形码符号读取系统所支持的自动化手指指向识别来读取条形码符号的方法。
在数字成像器操作的手支持和免提(台面)支持模式期间，在其中采用手指指向触发操作方法，该系统控制子系统30实施通过图5A至5C的流程图描述的控制方法。 
如图5A中在块A处所指示的，该过程中的第一步涉及在FOV内自动检测对象。这将涉及使用自动对象检测子系统来检测对象，所述自动对象检测子系统可以将基于IR的光束投射到该FOV中并检测来自存在于该FOV中的对象的返回信号，以便对其进行检测。 
然后在块B处，该系统捕捉该FOV内的对象的数字图像，并在块C处，评价(即分析)该数字图像以致力于检测在该数字图像中(一个或多个)拉长对象200的存在，所述拉长对象200指示在该FOV中指向手指201的存在。这将涉及使用图像捕捉和缓冲子系统25捕捉和缓冲至少单个数字图像数据帧。 
在块D处，该系统，采用子系统25且是模块25A，自动处理数字图像数据并且在所捕捉图像中确定是否存在拉长对象。如果在块D处在该数字图像中未检测到拉长对象，则在块E处，该系统确定在该数字图像内是否检测到单个条形码符号。如果在块E处检测到单个条形码符号，则在块F处该系统确定该条形码符号是否是可解码的，并且如果是这样的，则在块G处，该系统对该条形码符号进行解码并向主机系统发送符号字符数据。如果在块F处该条形码符号是不可解码的，则在块H处该系统向主机系统发送解码失败通知，并返回到块B，如所指示的。 
如果在块E处，该系统在所捕捉数字图像中未读取单个条形码符号，则在块I处该系统使用默认选单扫描和ROI参数，然后在块F处重新尝试对所检测的条形码符号进行解码，如所示出的。 
如果在块D处，该系统在该FOV的图像内确实检测到拉长图像，这指示在该系统的FOV中存在指向手指，则在块J处，该系统确定在该图像内是否只检测到一个(1)拉长对象200。如果是这样的，则在块K处该系统捕捉和缓冲该FOV的多个数字图像，并且在块L处比较所述数字图像以检测所检测到的拉长对象(即指向手指)的位置变化。然后在块M处，该系统定位该单个拉长对象200的端点，然后在块N处，确定该对象是否移动。如果该系统在块N处确定该对象确实移动了，则该系统返回块A并捕捉另一图像且重新开始该流程图中在块A处所指示的处理。 
如果在块N处，该系统确定该单个拉长对象(即指向手指)在该FOV中未移动，则在块O处，该系统确定是否在接近于在块M处所确定的拉长对象的端点坐标的邻近区域202中定位/检测到条形码符号。如果检测/定位到条形码符号203接近于该拉长对象(即指向手指)的端点，即在接近于该指向手指200端部的感兴趣区域(ROI)202中，则在块P处该系统确定此条形码是否是可解码的，并且如果是这样的，则在块Q处，对该条形码符号进行解码并向主机系统传输该符号字符数据。如果所检测的条形码符号不是可解码的，则在块R处该系统发送解码失败通知消息并返回到该流程图中的块B，如所指示的。 
如果在块O处，检测到该条形码符号不接近于该拉长对象(即指向手指)的端点，则在块S处，该系统确定在该图像中是否检测到任何条形码符号，并且如果检测到条形码符号，则在块T处，该系统使用默认选单扫描/ROI默认，并返回到块P以确定该条形码符号是否是可解码的。如果在块S处，该系统确定在该图像中没有检测到条形码符号，则该系统返回到块H并发送解码失败通知。 
如果在块J处该系统在该图像中检测到不止一个拉长对象(即指示若干手指向外伸展并指向该FOV中的不同区域，这表示无意指向包含条形码符号的任何特定区域)，则在块U处，该系统捕捉和缓冲该FOV的多个数字图像，并且在块V处，比较所述数字图像以致力于检测所述拉长对象(即手指)的位置变化。在块W处，该系统定位拉长对象的端点，并在块X处该系统确定拉长对象在该FOV内是否移动。如果拉长对象已经移动，则该系统返回到块B并捕捉另一图像且重新开始图5A中所指示的过程。然而，如果该系统确定拉长对象没有移动，则在块Y处，该系统(即模块25A)在该数字图像中定位所检测的每个拉长对象的端点，并在块E处，确定具有与包含本地条形码符号的区域接近的端点的拉长对象的数目(即指向包含条形码符号的感兴趣区域的手指数目)。在块AA处，该系统于是确定是否在该数字图像中检测到的只有一个拉长对象具有与本地条形码接近的端点(即一个手指正指向包含条形码符号的感兴趣区域)，并且如果这是如此的，则返回到块P并确定该条形码符号是否是可解码的。然而，如果该系统确定在该数字图像中检测到具有与本地条形码接近的端点的不止一个拉长对象(即检测到不止一个手指正指向包含条形码符号的感兴趣区域)，则该系统返回到块R并发送解码失败通知，然后返回到块B，并且该系统返回到该控制过程中的此点。 
当数字成像条形码符号读取系统正在其手指指向触发操作模式下操作时的智能手指指向识别性能的几个示例。
当基于数字成像的系统1正在其手指指向触发模式下操作时，或者在其可手持系统操作模式或者可台面支持系统操作模式下操作时，用户可以通过仅将单个手指指向条形码符号选单上的特定符号，来读取在选单或任何其他对象上的特定条形码符号，并且当检测到此状况时，该系统将自动读取与用户的手指指向的端部最接近的条形码，以及将生成符号字符数据并将其传输给主机计算系统。 
如果用户的手是张开的，并且在指向配置中不止一个手指向外伸展(即，和符合伸展的对象)，则该系统将自动检测到此手状况，并将不读取该选单上任何条形码符号。 
在用户的手具有不止一个跨越该选单向外指向的手指，并且该系统检测到该手是静止的或者跨越该选单是移动的时，该系统于是将不读取该选单上的任何条形码符号。然而，当用户的手跨越该选单停止移动，并且该用户仅单个手指指向该选单上的条形码符号时，该系统于是将读取与该用户的指向手指的端部接近的条形码符号。 
在用户指向该选单(即对象)上的条形码符号并读取所检测的条形码符号，以及用户然后将他的或她的指向手指移动到与先前读取的条形码符号不同的另一条形码符号之后，该系统将在图像处理期间自动检测这样的状况，并以连续的方式而无需用户将他的或她的手指移动到该系统的FOV之外自动地读取该不同的条形码符号。 
这些只是在手持式或免提式系统操作模式下条形码符号读取期间，该系统1的智能手指指向识别性能的几个示例。 
替换实施例
虽然已经结合与涉及1D和2D条形码结构的各种类型的条形码符号读取应用，对说明性实施例进行了描述，但是应理解的是，对说明性实施例的基于成像的系统和方法可以被用来读取(即识别)任何机器可读标记、数据表单、或图形编码的智能形式，包括但不限于条形码符号结构、字母数字字符识别字符串、笔记、以及本领域目前已知或将来开发的不同的数据表单。在下文中，术语“码符号”应被视为包括所有这样的信息承载结构和其他图形编码的智能形 式。 
而且，本公开内容的数字成像系统还可以被用来在不同用户应用中检测、捕捉和处理包括印刷在驾照、通行证、信用卡、金融卡等上的照片和标记在内的各种类型的图形图像。 
因此，说明性实施例的数字成像系统所支持的手指指向触发操作模式可以被用来识别图像(使用适当的参考库和数据库)，以及读取如上所描述的不同符号体系的码符号。 
在本公开的替换实施例中，在照明子系统22内采用的照明阵列23可以使用固态光源而不是LED来实现，所述固态光源诸如，像在被转让给Metrologic Instruments公司且通过引用将其全部内容结合于此的共同未决的美国公开号20080283611A1中更加详细地教导的可见激光二极管(VLD)。 
而且，线性照明阵列23可以使用如在其全部内容通过引用结合于此的共同未决的美国公开号20080283611A1中非常详细地教导的可见照明源和不可见照明源这二者的组合来实现。这样的谱混合技术的使用将使得能够实现在使用最低可见光照明水平时，捕捉具有高对比度的条形码标签图像。 
虽然把CMOS图像检测阵列技术描述为被用在优选实施例中，但是应理解的是在替换实施例中，可以使用CCD型图像检测阵列技术，以及其他类型的图像检测技术。 
在上文中所瞄述的数字成像系统设计可以容易地被适配成用作工业或商业移动设备和/或固定定位的条形码读取器/成像器，其具有在工业界公共使用的接口，诸如，例如以太网TCP/IP。 
应理解的是可以以对于受益于本文所公开的新颖教导的本领域技术人员来说是将变成容易显而易见的各种方式来修改在说明性实施例的条形码符号读取系统中采用的数字图像捕捉和处理技术。其说明性实施例的所有这样的修改和变体应被视为处于在附于此的权利要求书的范围之内。 

Claims (3)

1.一种基于数字成像的图形标记识别系统，其特征在于该系统包括：
自动手指指向触发操作模式；
具有光传输孔的壳体；
设置在所述壳体中的图像形成和检测子系统，其具有图像形成光学器件，用来在对象照明和成像操作期间，产生视场并将其投射通过所述光传输孔并且到区域型图像检测阵列上，所述区域型图像检测阵列用于检测存在于所述视场内的对象的2D数字图像；
设置在所述壳体中的照明子系统，其包括照明阵列，用来在所述视场内产生照明场，并且对在所述视场内检测到的所述对象进行照明，使得所述照明反射离开所述对象并且向回传输通过所述光传输孔并且到所述图像检测阵列上以形成所述对象的所述2D数字图像；
设置在所述壳体中的图像捕捉和缓冲子系统，用来捕捉和缓冲由所述图像形成和检测子系统检测到的2D数字图像；和
数字图像处理子系统，用来在所述自动手指指向触发操作模式期间，处理由所述图像捕捉和缓冲子系统捕捉和缓冲的所述一个或多个2D数字图像，以及读取表示于其中的1D和2D码符号；
其中所述数字图像处理子系统包括指向手指识别和移动检测模块，用来自动处理由所述图像捕捉和缓冲子系统缓冲的所捕捉数字图像，并且支持所述自动手指指向触发操作模式所需的图像处理操作，包括自动检测(i)用户的指向手指的存在，以及(ii)所述手指正指向的感兴趣区域，因此能够处理所述感兴趣区域中的像素以便读取由在所述感兴趣区域中包含的像素图形表示的图形标记项。
2.根据权利要求1所述的基于数字成像的图形标记识别系统，其特征在于该系统还包括：
输入/输出子系统，其被设置在所述壳体中，用来把经处理的图形数据输出到外部主机系统或其他信息接收或响应设备；和
系统控制子系统，其被设置在所述壳体中，用来在对象检测、照明和成像操作期间控制和/或协调所述子系统。 
3.根据权利要求1所述的基于数字成像的图形标记识别系统，其特征在于所述照明子系统包括LED阵列。 
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