AS 2570-1982

1 - AS 2570-1982 PRINTING SPECIFICATIONS FOR OPTICAL CHARACTER RECOGNITION
4 - PREFACE
4 - CONTENTS
5 - 0 Introduction
5 - 0.1 Interpretation of the International Standard
5 - 0.2 Use of the International Standard
6 - 0.3 Annexes
6 - 1 Scope and field of application
6 - 2 References
6 - 3 Spectral requirements
6 - 3.1 General
6 - 3.2 Spectral bands
6 - 4 Paper specifications for OCR
6 - 4.1 General
6 - 4.2 Luminous reflectance factor of paper
7 - 4.3 Dirt in paper
8 - 4.4 Paper opacity
8 - 4.5 Variation in reflectance of paper
8 - 5 Characteristics of the printed image
8 - 5.1 General
8 - 5.2 Print quality tolerance ranges
9 - 5.3 Definition of character outline limits
14 - 5.4 Measurements of parameters
23 - 6 Character positioning
23 - 6.1 General
23 - 6.2 Document reference edges
23 - 6.3 Character boundary
24 - 6.4 Character skew
24 - 6.5 Line boundary
24 - 6.6 Field
24 - 6.7 Horizontal positioning of characters within a line
25 - 6.8 Character alignment within a line
25 - 6.9 Printing area
25 - 6.10 Clear area
26 - 6.11 Margin
26 - 6.12 Line separation
26 - 6.13 Line spacing
28 - Annex A - Paper characteristics and measurements
28 - A.1 Spectral properties
28 - A.2 Paper opacity
29 - A.3 Paper gloss
29 - A.4 Variation in paper reflectance
32 - Annex B - Characteristics of the printed image
32 - B.1 General
32 - B.2 Best fit
32 - B.3 Basic values
32 - B.4 Spectral bands for PCS
33 - B.5 Average PCS
33 - B.6 Spots and voids
34 - B.7 Strokewidth ranges
34 - B.8 Spots remote from a character
34 - B.9 Recommendation for lower-case OCR-B characters
35 - Annex C - Computer-aided method (CAM) of print quality measurement
35 - C.1 Introduction
35 - C.2 Scanning device
36 - C.3 Generation of COL gauges
37 - C.4 Pre-processing of scanned characters
38 - C.5 Evaluation of print parameters
41 - C.6 Output of the measurement
44 - Annex D - Character positioning
44 - D.1 Objectives of the character positioning requirements
44 - D.2 Document reference edge
44 - D.3 Clear area, printing area and margin
44 - D.4 Line spacing
45 - D.5 Line separation
45 - D.6 Character boundary
45 - D.7 Character spacing
45 - D.8 Character separation
45 - D.9 Character misalignment

Establishes the basis for industry standards for paper and printing to be used in Optical Character Recognition (OCR) systems. Provides for the identification and measurement of, and establishes specifications for, the relevant parameters and gives guidance for their use. Technically identical with ISO 1831:1980.

This International Standard contains the basic definitions, measurement requirements, specifications and recommendations for OCR paper and print.Three major parameters of a printed document for OCR media are covered. These are:- the optical properties of the paper to be used;- the optical and dimensional properties of the ink patterns forming OCR characters;- the basic requirements related to the position of OCR characters on the paper.The major factors of each of these areas pertinent to OCR are identified. Definitions of these items are given and bases for measurements are established.Basic specifications applicable to all OCR materials are imposed and recommendations for the implementation of an OCR system are made.