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1、 AIM Global Document: AIM DPM-1-2006 Direct Part Mark (DPM) Quality Guideline Document Type: AIM Bar Code Guideline Document Version: 1.0, 2006-12-12 Foreword This document was prepared by the Technical Symbology Committee (TSC) of AIM, Inc. (AIM Global), the trade association for the Automatic Iden
2、tification and Mobility industry. AIM Global is the source for technically accurate, unbiased, commercial-free, and up-to-date information on all Automatic Identification and Mobility technologies including: Bar Code including 2-D Symbologies Biometrics Enterprise Mobile Computing Machine Vision Mag
3、netic Stripe Optical Cards Optical Character Recognition Radio Frequency Identification Smart Cards Touch Memory Voice Recognition WLAN The association serves members world-wide through a network of AIM chapters. Member companies represent a wide array of AIDC technologies either as manufacturers or
4、 providers of equipment, systems, and services. A listing of AIM Globals membership and chapters can be found at (http:/www.aimglobal.org). Published by: AIM, Inc. 125 Warrendale-Bayne Road Suite 100 Warrendale PA 15086 Phone: +1 724 937 4470 Fax: +1 724 934 4495 Internet email: aidcaimglobal.org We
5、b: http:/www.aimglobal.org Copyright AIM, Inc. 2006 All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Neither AIM, Inc. or its individual officers, affiliates, or memb
6、er companies, individually or collectively assume any liability for the use of this document. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. AIM, Inc. shall not be held responsible for identifying any or all such patent rights. I
7、ndividuals or organizations that hold intellectual property that may be referenced in this document are encouraged to disclose their patents during the public review process. Table of Contents Introduction 1 1 Scope 2 2 Normative references . 2 3 Term(s) and definition(s) 2 4 Symbols (and abbreviate
8、d terms). 3 5 Overview of methodology. 3 6 Obtaining the image . 4 6.1 Orientation of the symbol to the camera. 4 6.1.1 Camera position. 4 6.1.2 Orienting the symbol 4 6.2 Lighting 4 6.2.1 Diffuse perpendicular (on-axis/bright field) (90). 4 6.2.2 Diffuse off-axis (D). 5 6.2.3 Low-angle, four direct
9、ion (30Q). 5 6.2.4 Low-angle, two direction (30T) 5 6.2.5 Low-angle, one direction (30S) 5 6.3 Image focus. 5 6.4 Reflectance calibration 5 6.5 Initial image reflectance level of the symbol under test 5 6.5.1 Initialize aperture size 5 6.5.2 Create initial histogram of symbol under test 5 6.5.3 Comp
10、ute mean 5 6.5.4 Optimize image 6 7 Obtaining the test image. 6 7.1 Binarize image. 6 7.2 Apply Reference Decode Algorithm 6 7.3 Connect areas of the same color 6 7.3.1 Initializing stick size and module color. 6 7.3.2 Connect like colors. 6 7.3.3 Apply the Reference Decode Algorithm. 7 7.3.4 Repeat
11、 if necessary. 7 7.3.5 Continue until end 7 7.4 Final image adjustment. 7 7.4.1 Determine grid-point reflectance with two apertures. 7 7.4.2 Create a grid-point histogram 8 7.4.3 Measure MeanLight. 8 7.4.4 Record parameters 8 7.4.5 Create binarized images for the Symbology Reference Decode 8 7.4.6 D
12、ecode. 8 8 Determine contrast parameters 8 8.1 Calculate Cell Contrast (CC). 8 8.2 Calculate Cell Modulation (CM) 8 8.3 Calculate % Reflectance of Symbol (Rtarget). 8 9 Grading. 9 9.1 Cell Contrast (CC). 9 9.2 Minimum Reflectance 9 9.3 Cell Modulation (CM) 9 9.4 Fixed pattern damage . 9 9.5 Final gr
13、ade 10 10. Communicating grade requirements and results. 10 10.3 Communicating Lighting 10 10.3.1 Low-angle lighting 10 10.3.2 High-angle lighting . 10 10.3.3 Lighting orientation grade. 10 10.3.4 Lighting angle grade. 10 10.4 Communicating the use of a proprietary decode. 11 10.4.1 11 10.4.2 11 10.
14、4.3 11 Annex A (normative) 12 Threshold determination method. 12 Annex B (informative) 13 Communicating the grade . 13 B.1 Scanning environment examples 13 B.1.1 Category 0 part description. 13 B.1.2 Category 1 part description. 13 B.1.3 Category 2 part description. 13 B.1.4 Category 3 part descript
15、ion. 13 B.2 Grade communication examples 13 B.2.1 Grade requirement examples 14 B.2.1.1 Category 0 part requirement 14 B.2.1.2 Category 1 part requirement 14 B.2.1.3 Category 2 part requirement 14 B.2.2 Grade reporting examples. 14 B.2.2.1 Category 0 part reporting . 14 B.2.2.2 Category 1 part repor
16、ting . 14 B.2.2.3 Category 2 part reporting . 14 B.3.2 Application grade reporting 15 B.3.2.1 Category 0 part reporting . 15 B.3.2.2 Category 1 part reporting . 15 B.3.2.1 Category 2 part reporting . 15 Annex C (informative) 16 Cross Reference to ISO/IEC 15415 16 AIM DPM-1-2006 Page 1 Introduction Direct Part Marking (DPM) is a technology whereby, generally, an item is physically altered to produce two different surface conditions. This alteration can be accomplished by various means i
