SMPTE RP 27 1-1989 Specifications for Operational Alignment Test Pattern for Television.pdf

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1、SMPTE RP*i!7-L 89 W 8357403 0000453 430 W B Specifications for Operatiowl Alignment THt Pattern for Televirwn RP 27.1-1989 Page 1 of 4 pages 1. Scobe tional checks and adiustments of focus. resolution 1 This practice describes the format, dimensions, and optical densities for a test pattern transpar

2、- ency to be used as an operational alignment tool for television systems. response, mid-band streaking, astigmatism, field uniformity, scanning size, linearity, and interlace in live and film television systems. 2. Purpose 3. Description The purpose of this practice is to provide a sim- plified tes

3、t pattern to facilitate day-to-day opera- 9.1 Pattern. A reproduction of the test pattern is shown in Fig. 1. Fig. 1 Reproduction of Test Pattern Copyright I989 by the SOCIETY OF MOTION PICTURE AiYD TILEVISIOA ENGINEERS 595 West Hnrtsale Avenue, While Plains, NY i0607, (914) 761-100 Revision of RP 2

4、7.1-1983 Approved February 28, i989 SMPTE RP*27.L 89 EB 8357403 0000454 377 E Page 2 of 4 pages 3.2 Background. The background of the test pattern is black to minimize interference when evaluating the television waveform display. (See 5.2.) 3.3 White Bars. White bars of equal size are located on eac

5、h side, above and below the central spatial .frequency bursts and in each of the four corners. The bars are provided to establish a white level to evaluate the white signal uniformity of the sys- tem. The two bars located above and below the central spatial frequency bursts are also used to evaluate

6、 mid-band streaking. 3.4 Spatial Frequency Bursts. All spatial frequency bursts are calibrated in television lines per picture height and are located in the central portion of the test pattern and at each of the four corners. The central bursts are arranged with the highest line numbers nearest the

7、center of the pattern where optical and electrical performance is maxi- mum. The spatial frequency bursts located in each of the four corners are horizontally positioned so that they do not overlap each other when viewed on a waveform monitor triggered at a horizontal rate. 3.5 Electrical Alignment.

8、 A bulls-eye pattern is lo- cated at the center of the test pattern to facilitate pickup tube beam alignment. 3.6 Horizontal and Vertical Wedges. Horizontal and vertical wedges are located near the center of the test pattern to facilitate beam alignment for mini- mum astigmatism. The horizontal wedg

9、e can also be used to check scanning interlace. 3.7 Circles and Diagonal Lines. Circles and diagonal lines are provided to check system geometry. They have clear density to minimize interference when evaluating the television waveform display. (See 3.8 Boundary Arrows and Black-and-white Border. The

10、 eight boundary arrows and black-ancl-white border provide a check on system centering, scan- ning size, and equipment clamp performance. (See 5.3.) 3.9 Pattern Identification. The identification number of this document shall appear on the slide in the area specified in Fig. 2. 3.10 Manufacturers Id

11、entification. Identification of the manufacturer shall appear on the slide mount outside the pattern area. 5.4.) 4. Format 4.1 Dimensions. The dimensions of the test pattern shall be as shown in Figs. 2 and 3. All dimensions are in percentage of picture height. One hundred percent picture height is

12、equal to the outside di- RP27.1-1989 ameter of the largest circ!. No dimensions, di- niensioii lines, or centerlines are to appear on the final product. 4.2 Image Size. The size of the area inside the black- and-white border, as indicated by the eight bound- ary arrows, shall be as follows: 35-mm te

13、st films shall have dimensions in accord- ance with American National Standard for Mo- tion-Picture Film (35-mm) - Television Image Area, ANSI PH22.95-1984. 16-mm test films shall have dimensions in accordance with American Na- tional Standard Dimensions for Television Image Area on 16-mm Motion-Pic

14、ture Film, ANSI PH22. 96-1982. 4.3 Black-and-white Border. Height and width di- mensions of the black-and-white border shall be as follows: For 35- and 16-mm motion-picture films, the black- and-white border shall extend to the dimensions of the negative image as specified by Style A in American Nat

15、ional Standard for Motion-Picture Film (35-mm) - Camera Aperture Images, ANSI/ SMPTE 59-1989; and American National Stand- ard for Motion-Picture Film (16-mm) - Camera Aperture Image and Usage, ANSI/SMPTE 7-1988. 4.4 Corner Circles. Each of the four corner circles shall be located so that its outsid

16、e diameter is tangent to the perimeter of the pattern in its respective corner. 4.5 Diagonal Lines. Diagonal lines shall be drawn between opposing corners as shown in Fig. 2 and shall not intersect any of the pattern elements. 4.6 Line Widths. Line widths for the circumference of the five circles an

17、d the diagonal lines shall be 0.50 ? 0.05 percent. 4.7 Spatial Frequency Burst. Each spatial frequency burst width “W” is nominally equal to 6 percent of picture height plus one additional half cycle of white to provide a burst pattern which starts and ends with a white half cycle. The ratio of the

18、width of the black half cycle to the width of the white half cycle shall be 1.00 I 0.05. A tabulation of the nominal dimensions in terms of picture height is listed in the table. Line Width Burst Width “W in Percent of in Percent of Line Number Picture Height Picture Height 100 1 .o0 200 0.50 300 0.

19、33 400 0.25 500 0.20 600 0.17 7.00 6.50 6.33 6.25 6.20 6.17 Page 3 of 4 pages SMPTE RP*27.1 B9 8357401 0000455 203 RP 27.1-1989 I SMPTE RPx27.1 89 I 8357401 000045b L4T Page 4 o j 4 pages 5. Optical Densities 5.1 Optical Densities. All optical densities shall be measured in accordance with American

20、National Standard for Photography - Density Measure- ments - Geometric Conditions for Transmission Density, ANSI PH2.19-1986. 5.2 Background. The black background shall have a density greater than 1.9. 5.3 White Bars and Boundary Arrows. The eight white bars and boundary arrows shall be nominally cl

21、ear. 5.4 Circles, Diagonal Lines, and Lettering. Circles, diagonal lines, and lettering shall be nominally clear. 5.5 Bursts, Wedges, Bulls-Eye, and Border. Spatial frequency bursts, wedges, bulls-eye, and black- and-white border shall have a black density greater than 1.9 and the white shall be nom

22、inally clear. 500 LINE SPATIAL BURST NOTE 1: Silver-image films scatter light such that the ef- fective density in the specular optical system of the tele- vision film chain is increased by an average factor of 1.35 over that measured in diffuse light. For dye images, this light-scatter factor (Call

23、ier Q) is approximately 1.0. Inas- much as it is common practice to reproduce this test pat- tern on photographic silver film, it should not be used for accurate adjustment of color telecine gain and black level. NOTE 2: Test material conforming to this practice is available from the Society of Motion Picture and Tele- 4 7200 LINE EQUIVALENT 400 LINE 1 EQUIVALENT 1 1.300 LINE EQUIVALENT EQUAL TO D I L7 SPACES j I L2.5- 7 k-5.0-3 1200 LINE EQUIVALENT Fia. 3 RP27.1-1989 600 LINE S PATI AL BURST - _. - - vision Engineers. Enlargement of Central Portion of Fig. 2