RU15067U1 - COLORED TEST TABLES TELEVISION - Google Patents

Abstract

1. A color test television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions correlating as 3: 4, and containing a reference frame around the perimeter, characterized in that, in order to enable objective and subjective quality assessment the color rendering of the television camera, the links of the television path and the entire television path as a whole, contains four gradations of white and eleven color groups, each of which has four colors of one wind tone with a saturation of 1.0, 0.7, 0.5 and 0.3, the reflection coefficients of the gradations of white should be equal to 70 ± 3%, 35 ± 3%, 20 ± 3% and 4-1.5% moreover, the colors of the test samples are selected so that the colors of saturated colors lie in all areas of the triangle of colors transmitted in television: red, brick red, orange, yellow, green 1, green 2, blue, sea wave, blue, purple, purple, and the colors of the same tone with different saturation were distributed evenly from saturated to white. 2. A color test television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions correlating as 3: 4, and containing a reference frame around the perimeter, characterized in that, in order to enable objective and subjective assessment of the color rendering quality of television the camera, the links of the television channel and the entire television channel as a whole, contains nine pairs of elements consisting of low saturated (0.5) and saturated colors of one color tone: cr asnogo, orange, yellow, green 1,

Description

COLORED TEST TABLES TELEVISION

The utility model relates to television technology and can be used to measure colorimetric parameters and resolution in the color of television cameras and the television path of the television broadcasting system “from light to light.

In modern television, the accuracy of measurements of television equipment is extremely important, because the dimensions of modern television cameras tend to decrease rapidly. This increases the functionality of television equipment: sensitivity and resolution of television cameras. Therefore, the characteristics of a precision instrument for measuring television cameras -t are of utmost importance.

test tables.

Known television test table made in the form of black and white stripes, both in the horizontal and in the personnel direction, and the table,

made in the form of vertical color bars containing primary colors

receiver color system, complementary colors, black and white

patches and skin colors.

See USSR Author's Certificate SU 12643733A1 H 04 N 5/208, 10.15.86

"A signal conditioning device for correcting television distortion

H04 N 17/00 The disadvantage of these test tables is the impossibility

evaluation of colorimetric parameters and resolution in color of television cameras and the entire television path as a whole (“from light to light).

The purpose of the utility model is to create color test television tables, which should provide an objective and subjective assessment of the following parameters:

1. color rendering quality of color television cameras, taking into account color tone distortion and color saturation,.

2. The quality of color rendering of the links of the television path and the entire path as a whole,

3. Identity of color rendition of television cameras,

4. horizontal and vertical resolution in the color of television cameras and, in the aggregate, other parts of the television path connected in series (VCR, mixer, encoder, etc.), up to the entire television path as a whole, including the television receiver.

The chromaticity coordinates for the test colors that make up the color elements of the tables should lie within the triangle of colors transmitted in television in accordance with GOST 7845 both when illuminated by a light source having a color temperature of radiation equal to 3200K (studio lighting), and when illuminated by a light source having

2 color radiation temperature equal to 5000K - 6500K (natural

lighting, cold light).

The functionality indicated in tt.1 and p. 2 are implemented, in particular, in the table, which has the name CIT-02M-98 (figure 1) and contains four gradations of white and eleven groups of colors, each of which has four colors one color tone with a saturation equal to 1.0; 0.7; 0.5 and 0.3. Reflection coefficients of white gradations should be equal to 70% ± 3%, 35% ± 3%, 20% ± 3% and 4% - 1.5%. The colors of the test samples are selected so that the saturated colors of the colors lie in all areas of the triangle of the colors transmitted in television: red, brick red, orange, yellow, green 1, green 2, cyan, sea wave, blue, purple, magenta, and colors single tones with different saturations were evenly distributed from saturated to white.

The functionality specified in paragraph 1 and paragraph 2 are implemented, in particular, in the table, which has the name CIT-03-98 (figure 2), contains nine pairs of elements consisting of low saturated (0.5) and saturated

colors of one color tone: red, orange, yellow, green 1,

green 2, sea wave, blue, purple, purple, as well as white (gray) and black.

The functionality indicated in clause 1, clause 2 and clause 3 is implemented, in particular, in the table, which has the name CIT-01M-97 (Fig. 3) and contains

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white and black stripes and six stripes of the following saturated colors: yellow, blue, green, purple, red and blue.

With an objective assessment of the color rendering quality, the tables are installed in front of the television camera and illuminated by a lighting device with a light source having a color temperature of radiation equal to 3200K or 6000K. Tables should be evenly lit, and the illumination on the table should not exceed 2000 lux. For this lighting, the white balance of the camera is preliminarily drawn. On the screen of a television receiver with colorimetric parameters that meet the requirements of GOST 7845 Broadcast television system. Main parameters. Methods of measurement, the color coordinates of the image of test colors are measured by a television colorimeter, which are compared with the reference coordinates.

In a visual assessment of the color rendering quality, the tables are installed in front of the television camera and illuminated by a lighting device with a light source having a color temperature of radiation equal to 6000K. A visual comparison of the color of the table and its image on the screen of a television receiver is carried out.

When assessing the color rendering identity, the TsIT-01M-98 table is installed in front of two television cameras and fits into the frame by reference marks after a preliminary white balance for each camera. The mixer divides the frame into two halves horizontally: 4 the image from the first camera occupies the upper half of the frame, from the second lower. Based on the images of the table obtained from two cameras on the screen of the television receiver, a visual assessment of the color rendering identity is carried out. If there are several cameras, they are alternately compared and the cameras closest in color rendition are selected. In an objective assessment of the color rendition identity after a pre-made white balance of the color cameras compared on the color rendition, the color coordinates of the test colors are measured on the screen of the television receiver with a television colorimeter, the differences for each color are calculated, and the color rendition is judged by the calculation results.

The table named ITM-05-98 (figure 4) contains a group of alternating strokes of saturated colors in the form of two horizontal of two vertical wedges, separated by black and white wedge-shaped areas (figure 4). One of the vertical wedges and one of the horizontal wedges are eight strips of saturated

red, separated by strips of saturated blue

colors. The second group of vertical and horizontal wedges contains eight strips of saturated blue, separated by wedge-shaped strips of saturated yellow. The table contains continuous non-linear resolution assessment scales from 30 to 240

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television lines and has intermediate indicators of the values of 45, 60, 90,120 and 180 television lines.

To determine the resolution in the color of the television equipment, the table is installed in front of the television camera and illuminated by a light source at which the white balance of the camera is preliminarily taken. The table should be evenly lit, and the illumination on. it must, correspond to the dammgalyarmu mode of operation of the camera. A television signal that has passed through the channels of formation and processing, being tested for. color resolution is fed to a control television receiver that meets the above requirements. Moreover, the image of the table. Must be inscribed in the active part. The receiver raster precisely by reference marks.

The resolution in color is determined by marks on a non-linear scale, at which the original color of the wedges changes or becomes gray (black).

Figure 1 shows the color test television table CIT-02M-98. The table contains a gray scale of four gradations of brightness and eleven test colors of the same color tone, but of different saturation (100%, 70%, 50%. 30%): red (Fig. 1, item 1), brick red (Fig. 1, ), orange (Fig. 1, shz.Z-X yellow (Fig. 1, pos. 4), green 1 (Fig. 1, pos. 5), green 2 (Fig. 1), blue (Fig. 1, pos. 7), sea wave (pos. 8), purple (pos. 9), magenta (pos. 10), blue (pos. 11). Fig. 2 shows a color test television table

CIT-03-98. The table contains nine pairs of elements consisting of low saturated (0.5) and saturated colors of one color tone: red (Fig. 2, pos. A), orange (Fig. 2, pos. 2), yellow (Fig. 2, pos. C), green 1 (figure 2, position 4), green 2 (figure 2, position 3), sea wave (figure 2, position 6), blue (figure 2, position 7), purple (figure 2, position 8), purple (figure 2, position 9), as well as white (gray) (figure 2, position 10) and black (figure 2, position 11).

In Fig.3 shows a color test television table CIT-01M-98.

The table contains white (FIG. 3, position 1), yellow (FIG. 3, position 2), blue (FIG. 3, position 3), green (FIG. 3, position 4), magenta (FIG. 3, position 5) ), red (Fig. 3, position 6), blue (Fig. 3, position 7) and black (Fig. 3, position 8) stripes.

Figure 4 shows the table color test television ITM-05-98. The table contains four groups of alternating strokes of saturated colors:

the first group in the form of a horizontal wedge of eight stripes of red on a blue background (figure 4, position 1),

-the second group in the form of a vertical wedge of eight stripes of blue on a yellow background (figure 4, position 2),

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- the fourth group in the form of a vertical wedge of eight stripes of red on a blue background (figure 4, position 4).

The indicated areas of strokes are separated by black and white wedge-shaped areas. The table contains continuous non-linear scales for assessing the resolution of 30 to 240 television lines and have intermediate indicators of values of 45, 60, 90, 120 and 180 television

lines.

All tables have perimeter marks of the size of the working field in the form

reference frame.

The described color test television tables can be used to configure and monitor television equipment.

Authors:

S.R. Nemtsova N.K. Milenin I.B. Sokolova E.V. Gerdler A.I. Konikov

1. USSR author's certificate SU1264373A1 H04N 5 / 208D 5.10.86 “Signal conditioning device for correcting distortions of a television image.

2.International standard ШС 61146-1 (1994) Video cameras-Methods of measuring.

3.EBU Technical Document 3238-1983 Methods of measuring the main characteristics of tv cameras.

4.EBU Technical Document 3237-1989 Methods of measuring the the colorimetric fidelity of tv cameras.

5.EBU Technical Document 3238-1983 Methods of measuring the characteristics of CCD cameras.

6.Standard SMPTE 303M Color Reference Pattern.

7. GOST 7845-92 Broadcast television system. Main parameters. Measurement Methods.

Literature

Claims (4)

1. A color test television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions correlating as 3: 4, and containing a reference frame around the perimeter, characterized in that, in order to enable objective and subjective quality assessment the color rendering of the television camera, the links of the television path and the entire television path as a whole, contains four gradations of white and eleven color groups, each of which has four colors of one wind tone with a saturation of 1.0, 0.7, 0.5 and 0.3, the reflection coefficients of the gradations of white should be equal to 70 ± 3%, 35 ± 3%, 20 ± 3% and 4-1.5% moreover, the colors of the test samples are selected so that the colors of saturated colors lie in all areas of the triangle of colors transmitted in television: red, brick red, orange, yellow, green 1, green 2, blue, sea wave, blue, purple, purple, and the colors of the same tone with different saturation were distributed evenly from saturated to white.  2. A test color television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions correlating as 3: 4, and containing a reference frame around the perimeter, characterized in that, in order to enable objective and subjective quality assessment the color rendering of the television camera, the links of the television path and the entire television path as a whole, contains nine pairs of elements consisting of low saturated (0.5) and saturated colors of one color tone: The red, orange, yellow, green, 1, 2 green, aqua, blue, violet, purple, and the tenth pair of elements - white (gray) and black.  3. A test color television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions correlating as 3: 4, and containing a reference frame around the perimeter, characterized in that in order to enable objective and subjective assessment of color reproduction identity a television camera, contains eight bands - white (gray) color, saturated colors: yellow, cyan, green, magenta, red, blue, and also black. 4. A color test television table made of a material having a matte reflective surface and overall vertical and horizontal dimensions corresponding to 3: 4 and containing a reference frame around the perimeter, characterized in that, in order to determine the resolution in the color of the television camera and television path, contains a group of alternating strokes of saturated colors in the form of two horizontal and two vertical wedges, separated by black and white wedge-shaped areas, one of the vert ikalnye wedges and one of the horizontal wedges are several saturated red strips separated by saturated blue strips, the second group of vertical and horizontal wedges contains several saturated blue strips separated by saturated yellow wedge-shaped strips, the table contains continuous non-linear resolution grading scales capacity from 30 to 240 television lines and has intermediate indicators of values of 45, 60, 90, 120 and 180 television lines.