1、BRITISH STANDARD BS 5477:1977 Method for Visual assessment, by grid assay, of dirt in paper for character recognition UDC 681.327.12:003:676.019.172BS5477:1977 This British Standard, having been prepared under the directionof the Data ProcessingStandards Committee,was published underthe authority of
2、 the Executive Board on 30 June1977 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference DPS/14 Draft for comment 76/61951 DC ISBN 0 580 09783 8 Cooperating organizations The Data Processing Standards Committee, under whose direction this British Standard
3、 was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Airways British Computer Society* British Paper and Board Industry Federation* British Printing Industries Federation* Business Equipment Trade Association* Civil
4、 Service Department Central Computer Agency* Committee of London Clearing Bankers* Department of Industry Department of Industry National Physical Laboratory* Department of the Environment Fire Research Station Electricity Supply Industry in England and Wales* Electronic Engineering Association* Eng
5、ineering Equipment Users Association* Government Communication Headquarters HM Customs and Excise Institute of Cost and Management Accountants Institute of Municipal Treasurers and Accountants (Incorporated) Institution of Electrical and Electronics Technician Engineers Institution of Electrical Eng
6、ineers Institution of Mechanical Engineers London Transport Executive Ministry of Defence National Coal Board* National Research Development Corporation Post Office* Society of British Aerospace Companies The organizations marked with an asterisk in the above list, together with the following, were
7、directly represented on the committee entrusted with the preparation of this British Standard: Her Majestys Stationery Office PIRA Research Association for the Paper and Board, Printing and Packaging Industries Production Engineering Research Association of Great Britain Amendments issued since publ
8、ication Amd. No. Date of issue CommentsBS5477:1977 BSI 12-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Definition 1 4 Equipment 1 5 Sampling and test area 1 6 Method 1 7 Report 1 8 Calibration 1 Publications referred to Inside back coverBS5
9、477:1977 ii BSI 12-1999 Foreword The grid assay method specified in this standard meets a need that has been felt by manufacturers and users of character recognition systems in data processing. It is the simpler of two methods contained in a draft revision of ISO/R1831 and is therefore fully in acco
10、rdance with the work currently being undertaken within ISO/TC97 “Computers and information processing”. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Stand
11、ard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpora
12、ted. This will be indicated in the amendment table on the inside front cover.BS5477:1977 BSI 12-1999 1 1 Scope This British Standard specifies a visual method of assessing dirt in paper used in character recognition systems. The method measures the proportion of the surface area containing particles
13、 that are immediately obvious to the eye. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definition For the purposes of this British Standard the following definition applies. dirt non-reflecting foreign particles embedded in a sheet o
14、f paper 4 Equipment The following equipment is required. a) Grid: a frame 1 m 1 m divided into100squares by fine wire. b) Working surface: to take paper and frame for viewing at a distance of about0.5m. c) Lighting: the lighting should be a close approximation to C.I.E. 1)recommended illuminant D65
15、as specified in BS950-1. The recommended level of illumination for this work is between750lx and 1500lx. BS 950-1 recommends750lx to3200lx, which could be excessively bright for viewing white papers. Care should be taken to minimize specular reflection in the direction of the observer. d) Cleaner: s
16、oft brush or vacuum cleaner to remove loose dirt or dust from the sample surface. e) Timer: to indicate 0.5 min or 1 min intervals. f) Counter: to tally the number of squares containing dirt. 5 Sampling and test area A total of6m 2of test samples shall be taken from a reel or stack of sheets in acco
17、rdance with BS3430. 6 Method Lay out sufficient test pieces, same side up, to form a square of area1m 2 . Remove loose dirt and dust from the surface. Place a grid over the test pieces. Start the timer and scan all the squares in turn in1min, recording once only with the counter the number of square
18、s seen to contain a dirt particle or particles. Repeat the test on the remaining5m 2 . 7 Report Report the number of squares per6m 2containing dirt. 8 Calibration Since observer-to-observer differences may exceed the variation due to change, observers should be selected by comparing assays and exclu
19、ding observers giving significantly high or low variation. Observer comparisons should be made periodically. For comparing results from different sources, assessed test pieces should be exchanged for calibration between groups of observers. 1) C.I.E. International Commission on Illumination.2 blankB
20、S5477:1977 BSI 12-1999 Publications referred to BS 950, Artificial daylight for the assessment of colour. BS 950-1, Illuminant for colour matching and colour appraisal. BS 3430, Sampling of paper and board for testing. ISO/R 1831, Printing specifications for optical character recognition. BS 5477:19
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