ISO/IEC TR 19782:2006 信息技术-自动识别和数据采技术-条形码阅读光面的影响及低层不透明性

标准编号：ISO/IEC TR 19782:2006

中文名称：信息技术-自动识别和数据采技术-条形码阅读光面的影响及低层不透明性

英文名称：Information technology — Automatic identification and data capture techniques — Effects of gloss and low substrate opacity on reading of bar code symbols

发布日期：2006-06

标准范围

条形码系统的用户经历了读取率差的问题。这些读取速率问题有时可归因于衬底或图像或两者的光谱光泽。在许多条形码应用中，扫描仪相对于条形码符号的位置和取向可以由操作者直接控制。在这些应用中，向阅读器呈现条形码符号通常将由操作者操纵以实现最佳性能。然而，在使用固定位置自动读取系统的条形码应用中，控制条形码符号呈现给读取器并实现优化性能的能力减弱。由于当今供应链中条形码标记的物品数量非常大，即使读取率的小幅降低也可能代表重大的物流问题。传统的光泽度测量是在最大化镜面反射的角度进行的，并且不能提供可用于预测其他角度的性能的结果。此外，许多激光扫描仪使用逆集体光学系统，其将对应于使用零度入射角的光泽计，这通常是不可用的。目前的国际条形码质量标准，例如ISO/IEC 15416，没有将条形码图像或基底的光泽度的影响考虑到质量等级评定中。因此，“4”级标签可以是高光泽或低光泽。低光泽标签和图像往往在所有扫描系统中都能很好地工作，而高光泽标签和图像可能不能。在缺乏行业规范的情况下，用户在要求供应商提供在其系统中良好工作的标签时没有方便的参考。ISO/IEC TR 19782:2006提供了一种用于测量光泽度的方法，该方法将允许用户判断条形码符号和基底是否适合在其应用中使用的读取系统。衬底的低不透明度会降低系统性能，因为它会降低条形码符号的表观对比度。因此，ISO/IEC TR 19782:2006提供了用于测量基底不透明度的装置。ISO/IEC TR 19782:2006中描述的测试方法提供了用于产生可重复测量的方法。在特定应用中，可能需要将这些测量值与实际性能相关联。例如，背靠深色液体的基材可能表现出比干燥测量时更低的不透明度。ISO/IEC TR 19782:2006给出了处理基材光泽和/或低不透明度对条形码符号在被读取和验证系统扫描时的性能的影响的指南。它定义了光泽度和不透明度的测量方法；它识别存在读取问题风险的条件和值，并向用户提供有关基板规格和扫描系统设置的建议，以最大限度地减少这些问题。它还解决了当一个或两个因素都存在时验证结果和读取性能之间的关系。ISO/IEC TR 19782:2006适用于指定或实施标签系统的人员以及参与读取包装、组件和其他条形码符号载体上的条形码符号的人员。

Users of bar code systems have experienced problems with poor read rates. These read rate problems can sometimes be attributed to spectral gloss from either the substrate or the image or both.

In many bar code applications, the position and orientation of the scanner relative to the bar code symbol can be directly controlled by the operator. In these applications, the presentation of the bar code symbol to the reader will usually be manipulated by the operator to achieve optimal performance. However, in bar code applications using fixed position automated reading systems, the ability to control bar code symbol presentation to the reader and achieve optimised performance is diminished.

Due to the very high volume of bar code marked items in today's supply chain, even a small reduction in read rate can represent significant logistics problems.

Traditional gloss measurements are made at the angle that maximises specular reflection and do not provide results that can be used to predict performance at other angles. Moreover, many laser scanners use a retro-collective optical system that would correspond to a gloss meter using a zero degree angle of incidence, which is not commonly available.

Present international bar code quality standards, such as ISO/IEC 15416, do not factor the impact of gloss from either the bar code image or substrate into quality grade ratings. Thus a Grade '4' label may be high gloss or low gloss. Low gloss labels and images tend to work well in all scanning systems, while high gloss labels and images may not. In the absence of industry specifications, users have no convenient reference to use when requesting suppliers to provide labels that will work well in their systems. ISO/IEC TR 19782:2006 provides a method for the measurement of gloss that will permit users to judge if the bar code symbol and substrate are suitably matched for the reading system used in their application.

Low opacity of the substrate can degrade system performance because it may reduce the apparent contrast of the bar code symbol. ISO/IEC TR 19782:2006 therefore provides means for measuring the substrate opacity.

The test method described in ISO/IEC TR 19782:2006 provides a means for the production of reproducible measurements. In specific applications, it may be necessary to correlate these measurements to practical performance. For example, a substrate backed by dark liquid may exhibit lower opacity than when measured dry.

ISO/IEC TR 19782:2006 gives guidelines to deal with the effects of substrate gloss and/or low opacity on the performance of bar code symbols when scanned by reading and verification systems.

It defines methods of measurement for gloss and opacity; it identifies conditions and values that present a risk of reading problems and provides recommendations to users on the specification of substrates and the set-up of scanning systems to minimize these problems. It also addresses the relationship between verification results and read performance when either or both of the factors are present.

ISO/IEC TR 19782:2006 is intended for those who specify or implement labelling systems and those involved in the reading of bar code symbols on packages, components and other carriers of bar code symbols.

标准预览图