1、 Copyright 2008 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved October 10, 2008 Table of Contents Page Foreword . 2 Intellectual Property 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Definition 4 5 Ge
2、neral Format 4 5.1 Format 4 5.2 Use of the Other Edge . 4 5.3 Film 4 6 Human-Readable Key Numbers 5 6.1 Key Number . 5 6.2 Dimensions 5 6.3 Reference Mark 5 6.4 Alignment with Respect to Perforations. 5 6.5 Repeat Frequency 5 6.6 Format and Orientation 5 7 Machine-Readable Key Numbers 8 7.1 Key Numb
3、ers . 8 7.2 Dimensions 8 7.3 Repeat Frequency 8 7.4 Format 8 8 Optional Manufacturer-Identification Information 9 8.1 Additional Information 9 8.2 Recommended Minimum Information 9 8.3 Repeat Distance. 9 9 Optional Density Measurement Patch 10 9.1 Density Patch. 10 9.2 Shape and Size 10 9.3 Color an
4、d Density. 10 9.4 Repeat Frequency 10 10 Bar Code Scanner and Density Specifications 10 10.1 Scanner Spectral Sensitivity 10 10.2 Quality of Machine-Readable Messages . 10 10.3 Density of Printed Machine-Readable Messages 12 11 Color of Edge Print Information 12 Page 1 of 12 pages SMPTE 271-2008Revi
5、sion of SMPTE 271-2002 SMPTE STANDARD for Motion-Picture Film (16-mm) Manufacturer-Printed Latent Image Identification Information SMPTE 271-2008 Page 2 of 12 pages Foreword SMPTE (the Society of Motion Picture and Television Engineers) is an internationally-recognized standards developing organizat
6、ion. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Com
7、mittees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in Part XIII of its Administrative Practices. This SMPTE Engi
8、neering Document was prepared by Technology Committee F2. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this Standard. However, attention is drawn to the possibility that some of the elements of this do
9、cument may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. SMPTE 271-2008 Page 3 of 12 pages 1 Scope 1.1 This standard specifies the position and dimensions of machine-readable identification numbers. These numbers are intended to b
10、e a machine-readable version of the latent image key number. This standard also specifies the encoding format to be used for these machine-readable numbers, as well as the area scanned and the spectral characteristics of the scanner. 1.2 This standard also specifies the position, dimensions, and con
11、tent of human-readable identification (key) numbers for use on 16-mm motion-picture films intended for original photography or intermediate printing which also include the machine-readable key number described in 1.1. These numbers normally will be exposed onto the film at the time of manufacture. 1
12、.3 This standard further specifies an area that may be used for optional manufacturer-specific film-type identification information. 1.4 This standard also specifies an area on the film which is not to be exposed by the film manufacturer, thus leaving it available for customer data recording. 2 Conf
13、ormance Notation Normative text is text that describes elements of the design that are indispensable or contains the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or ad
14、ded editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:” The keywords
15、 “shall“ and “shall not“ indicate requirements strictly to be followed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or
16、excluding others; or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the
17、 document. The keyword “reserved” indicates a provision that is not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant implementation ac
18、cording to this document is one that includes all mandatory provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. 3 Normative References The fo
19、llowing standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the
20、 possibility of applying the most recent edition of the standards indicated below. SMPTE 109-2003, Motion-Picture Film (16-mm) Perforated 1R and 2R USS 128, Uniform Symbology Specification, 1986 version (available from Automatic Identification Manufacturers, Inc., 1326 Freeport Road, Pittsburgh, PA
21、15283) SMPTE 271-2008 Page 4 of 12 pages 4 Definition key number: A number, sometimes referred to as an edge number or footage number, that is printed with ink or exposed onto the film at the time of manufacture. The numbers are placed at regular intervals, typically six inches for 16-mm film. For t
22、he purposes of this standard, the key numbers are latent-image exposed. 5 General Format 5.1 Format The general format of the latent-image identification information shall be as shown in Figure 1. 5.2 Use of the Other Edge No latent information shall be placed along the upper edge of the film, as sh
23、own in Figure 1. This area is reserved for data recording at the time of photography. 5.3 Film This identification information is intended to be printed onto film cut and perforated in accordance with SMPTE 109. Figure 1 General format SMPTE 271-2008 Page 5 of 12 pages 6 Human-Readable Key Numbers 6
24、.1 Key Number An incrementing, human-readable key number shall be printed onto the film at the time of manufacture. The film shall be supplied to the user with the lowest number at the outside of the roll unless the sales format of the unit shown states differently. 6.2 Dimensions The height and wid
25、th of the human-readable key numbers shall be as specified in Figure 2 and Table 1. Note that the height of the first character is less than that of the others to allow for the reference mark specified in 6.3. The width of each human readable character is left to the manufacturers discretion, but it
26、 should be wide enough for good legibility, while still maintaining dimension F. A character height-to-width ratio of 14:10 and a space between characters of 214 of a character height is recommended. 6.3 Reference Mark A zero-frame reference mark shall be printed between the first human-readable key
27、 number and the edge of the film as shown in Figure 1. This may be above or below the character, depending upon which of the possible orientations allowed in 6.6.2 is used. The zero-frame reference mark shall be a filled circle with a diameter as given by dimension B3of Table 1. 6.4 Alignment with R
28、espect to Perforations The numbers shall be printed so that each of the three groups of four characters is centered between two perforations. To ensure visibility, the human-readable key numbers shall not be printed closer to the perforation than the distance specified as dimension F in Figure 2 and
29、 Table 1. 6.4.1 Since the key number is longer than one frame, the following rule shall be applied to frame identification: The frame immediately above the zero-frame reference mark is the one referenced by that key number. Other frames are specified by an offset which is written as an additional di
30、git(s) separated from the key number by a plus sign. Figure 3 shows an example of this rule. 6.5 Repeat Frequency The spacing from one key number to the next shall be 20 perforations. 6.6 Format and Orientation 6.6.1 Number and grouping of digits The human-readable key number shall consist of 2 alph
31、abetic characters and 10 digits. This alphanumeric code shall be separated into three groups of 4 characters, as shown in Figure 1. For the 10 digits, only the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 shall be used, and they shall be in normal counting sequence. It is recommended, although not requir
32、ed, that the ten thousands place not be allowed to increment within a single roll of film. SMPTE 271-2008 Page 6 of 12 pages Figure 2 Position and dimensions Table 1 Specifications Dimensions Inches Millimeters A Edge of film to bottom of characters 0.0115 0.0030 0.292 0.076 A Edge of film t o botto
33、m of bars 0.004 0.003 0.10 0.08 B Height of characters 0.525 0.0030 1.334 0.076 B1Height of bars and manufacturers information 0.0188 0.0030 0.478 0.076 B2Height of first character 0.033 min 0.039 max 0.84 min 0.99 max B3Height of zero-frame reference 0.018 min 0.024 max 0.46 min 0.61 max C Scanning
34、 slit length 0.006 max 0.15 max D Scanning slit width 0.005 max 0.13 max E Edge of film to centerline of scanning slit 0.013 0.002 0.33 0.05 F Key number to edge of perforation 0.030 min 0.76 min G Bar code displacement 0.188 0.020 4.78 0.51 H Length of bar code 0.9225 0.0200 23.432 0.058 J Quiet zo
35、ne (no print area) 0.100 min 2.54 min SMPTE 271-2008 Page 7 of 12 pages Figure 3 Alignment of zero-frame reference mark 6.6.2 Orientation The number may be placed in one of two orientations at the discretion of the film manufacturer. When the original negative film is held with the emulsion toward t
36、he viewer and the head toward the right, the numbers may be in either of the following orientations: Right side up, reading from tail to head; Upside down, reading from tail to head. In all cases, regardless of the orientation, the dot is above the trailing character (closest to the tail), as shown
37、in Figure 1. The human-readable key number shall precede the machine-readable key number; i.e., the human-readable key number shall be closer to the head of the roll. 6.6.3 Contents of the alphabetic characters The first two characters of the key number identify the manufacturer and film type. The c
38、haracter set used shall be the normal upper-case letters A through Z and other symbols at the discretion of the manufacturer. The first character shall identify the film manufacturer alphabetic code according to Table 2. Other letters are reserved for future assignment by the SMPTE. The second chara
39、cter shall be a film-type identifier. The film type identifier will be used in one of two ways per the manufacturers preference. The second character is used alone to identify film type. The second character is used in conjunction with the first character as a two-character film type identifier. The
40、 second character is chosen at the discretion of the film manufacturer. Table 2 Manufacturer alphabetic code Manufacturer Code AGFA-GEVAERT, N.V. A EASTMAN KODAK CO. E, K, V FUJIFILM CO. F ILFORD LTD. I Other or nondesignated (nothing) SMPTE 271-2008 Page 8 of 12 pages 7 Machine-Readable Key Numbers
41、 7.1 Key Numbers The machine-readable key numbers are intended to be a machine-readable version of the immediately adjacent human-readable key numbers. 7.2 Dimensions 7.2.1 The dimensions and lateral location of the machine-readable identification numbers shall be as specified in Figure 2 and Table
42、1. 7.2.2 The nominal width of the narrowest bar or space shall be 0.0075 in (0.190 mm). All other bars and spaces are to be integer multiples of the narrowest bar as specified in USS 128. The total bar code message, which consists of 123 elements (not counting the quiet zones), shall have a width as
43、 given by dimension H of Table 1. For measurement purposes, the width of the bar is the distance between two bar edges. A bar edge is defined as the point where the transmittance is halfway between the maximum adjacent space transmittance and the minimum adjacent bar transmittance. 7.2.3 The recordi
44、ng shall be made so that the azimuth of the record is at an angle of 90 1 to the reference edge of the film. 7.2.4 The lateral location, length, and width of the scanned area shall be as specified in Figure 2 and Table 1. 7.2.5 The reproducing (scanning) slit image shall be positioned at an angle of
45、 90 1 to the reference edge of the film. 7.3 Repeat Frequency The machine-readable message shall be immediately adjacent to the human-readable key number and shall repeat at the same frequency. 7.4 Format 7.4.1 The machine-readable numbers shall consist of a series of bars and spaces of varying widt
46、h that meet the bar code specification of USS 128. Code subset C of this specification, which allows double-density numeric digits, shall be used. 7.4.2 The data portion of the message shall be of fixed length and shall consist of 16 digits. Since code subset C encodes two digits per bar characters.
47、 In addition, quiet zones, a start character (for code C), a check sum character, and a stop character shall be recorded. Including the start and stop characters, the entire message shall be 11 bar code characters. 7.4.3 The start character shall be nearest the head end of the film and the stop char
48、acter shall be nearest the tail end of the film, regardless of the orientation of the human-readable characters; i.e., when the film is transported in the normal direction of travel past a fixed scanning position, the start character shall be read first. 7.4.4 The 8 bar code characters (16 data digi
49、ts) are defined as follows: 7.4.4.1 The first character shall be encoded with a two-digit manufacturer code. These codes shall be assigned as per Table 3. Other codes are reserved for future assignment by the SMPTE. SMPTE 271-2008 Page 9 of 12 pages Table 3 Manufacturer codes Manufacturer Code AGFA-GEVAERT, N.V. 11 EASTMAN KODAK CO. 12 FUJ
