1.1 本指南旨在供选择、设置和操作摄影设备的从业者使用，这些摄影设备旨在捕捉面部图像，以便与自动面部识别系统一起使用，或由训练有素的面部检查人员进行手动比较。本指南概述了如何实现ANSI/NIST-ITL-1-2011（2015年更新）附录E中定义的面部图像捕获规范。 1.2 ANSI/NIST-ITL-1-2011的附录E定义了一个控制良好的捕获环境和对象，而本文件将为无法实现捕获环境和主体控制的严格控制提供指导。 1.3 本指南介绍了二维（2D）传统图像的设备注意事项。它不涉及视频、扫描仪或三维（3D）捕获。 1.4 以国际单位制表示的值应视为标准值。 括号中给出的值是非SI单位的数学转换，仅供参考，不被视为标准值。 1.5 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 决定高度受控面部图像图像质量的关键因素（例如: 护照、警用马克杯、驾驶机动车等）在自动FR系统中的使用方面是很清楚的，并且是直接影响FR系统的搜索精度的关键因素。 4.2 图像质量在确定经过训练的面部检查者能够在多大程度上得出包含面部的两个图像是否可能属于同一个人的结论方面也起着重要作用。这适用于审查FR系统候选结果集或1:1图像比较。 4.3 本指南为在受控、半受控和非受控场景下捕获面部图像提供了指导，这些场景可分为以下类型的要求: 4.3.1 场景 指图像中的内容、主题和背景， 4.3.2 摄影， 指图像捕获所需的照明、聚焦和其他约束，以及 4.3.3 数字的 指的是将捕获的图像转换成数字记录。

1.1 This guide is intended for use by practitioners who are choosing, setting up, and operating photographic equipment designed to capture facial images for use with an automated Facial Recognition System or used for manual comparisons by a trained facial examiner. This guide provides an overview of how to achieve the specifications defined in Annex E of ANSI/NIST-ITL-1-2011, Update 2015, for capturing facial images. 1.2 Annex E of ANSI/NIST-ITL-1-2011 defines a well-controlled capture environment and subject whereas this document will give guidance where tight controls in the capture environment and subject control cannot be achieved. 1.3 This guide addresses equipment considerations for two-dimensional (2D) conventional images. It does not address video, scanners, or three-dimensional (3D) capture. 1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to non-SI units that are provided for information only and are not considered standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The key factors that determine image quality for highly controlled facial images (for example: passports, police mugshots, drive motor vehicle, etc.) are well understood with respect to their use in automated FR systems and are a critical factor which directly affects the searching accuracy of the FR system. 4.2 Image quality also plays a major role in determining the extent to which a trained facial examiner is able to reach a conclusion as to whether two images containing faces are likely to be of the same person or not. This applies to either reviewing a FR system candidate result set or 1:1 image comparisons. 4.3 This guide provides guidance for the capture of facial images under controlled, semi-controlled, and uncontrolled scenarios for constraints which can be categorized into the following types of requirements: 4.3.1 Scene, refers to the content, subject and background in the image, 4.3.2 Photographic, refers to lighting, focus and other constraints required for image capture, and 4.3.3 Digital, refers to the conversion of the captured image into a digital record.