First, the building decoration process indicators
1. Seat two armrests center to center width
The specification clause 3. 1. 1 stipulates that the use of aviation seats should not be less than 0.56m, and the net width between handrails should not be less than 0.48m. It is derived from the requirements of GB/T 21048-2007 national standard for five-star cinemas. A larger 3D theater in a private clubhouse will use an aviation seat.
With the sofa seat, the center-to-center width of the two handrails should not be less than 0.68m, and the net width between the handrails should not be less than 0.48m, which is derived from the minimum requirements for comfort after measuring the mainstream brand home theater sofa seats.
2. Seat row spacing
The specification clause 3.1.2 stipulates that the aerospace seat spacing should not be less than 1.1m, and the net width between adjacent two rows should not be less than 0.4m, which is derived from the GB/T 21048-2007 national standard to five-star cinema. Requirements. The sofa seat spacing should not be less than 1.5m, and the net width between adjacent rows should not be less than 0.5m, which is also derived from the minimum requirements for comfort after measuring the mainstream brand home theater sofa seats.
3. View height
The viewpoint height refers to the vertical distance from the horizontal reference to the midpoint of the lower edge of the screen.
GB/T 21048-2007 national standard for five-star cinema requirements point height should not be greater than 1.5m, should not be greater than 1.7m.
However, this indicator does not apply to private theaters with few seats, so the specification clause 3.1.3 revises the viewpoint height to be no more than 1.0m.
4. Recent line of sight
The closest line of sight is the horizontal distance from the eye of the first row of seats to the vertical line of the center of the screen.
GB/T 21048-2007 national standard for five-star cinema requires the nearest line of sight to be converted according to the 2.4:1 wide screen, which is not to be less than 1.44 times the height of the screen, and should not be less than 1.2 times the height of the screen.
The specification clause 3.1.4 revises the nearest line of sight to be less than 2.5 times the height of the screen, the wide screen horizontal angle of view corresponding to the 2.35:1 frame ratio is 50°, and the screen horizontal angle of view corresponding to the 16:9 frame ratio is 39°. It just meets THX's requirements for a home theater level perspective.
In the extreme case, the nearest line of sight is revised to be no less than 2.0 times the height of the screen, mainly considering the need for multiple rows of seats in a large private theater or private club, so that the horizontal viewing angle of the 2.35:1 frame is wider than the wide screen. And the horizontal angle of view corresponding to the 16:9 frame is 48°.
In view of the fact that more and more translucent screens are used by private cinemas, according to Alan C. Brawn's white paper "Defining the Differences Between Translucent Screens", when the screen brightness is 12fL, a micro-hole through-screen with a diameter of 0.5mm is used at the distance. Holes are not visible at 12 ft (3.658 m), so when using a microporous sound-permeable screen, this standard also specifies that the closest line of sight should not be less than 3.7 m.
5. Farthest viewing distance
The farthest distance is the horizontal distance from the eye of the last row of seats to the vertical line of the center of the screen.
The national standard GB/T 21048-2007 requires that the farthest line of sight of a five-star cinema be converted according to a 2.4:1 wide film screen, which is not more than 4.32 times the height of the screen, and should not be greater than 4.8 times the height of the screen.
The provisions of this specification 3.1.5 modify the farthest viewing distance to be not more than 3.5 times the height of the screen, the wide screen horizontal angle of view corresponding to the 2.35:1 frame ratio is 37°; and the horizontal viewing angle of the screen corresponding to the 16:9 aspect ratio is 29 °, also meets THX's requirements for a home theater level of view.
In the extreme case, the farthest line of sight is revised to be no more than 4.0 times the height of the screen when using a 16:9 frame-width screen, and should not be greater than 4.5 times the height of the screen when using a 2.35:1 frame-width screen. The need for multiple rows of seats in large private theaters and private club theaters, with a viewing angle of 4.0 times the screen height, corresponds to a 16:9 frame ratio with a horizontal viewing angle of 25°. When the viewing distance is 4.5 times the screen height, the horizontal screen angle corresponding to the 2.35:1 frame ratio is 29°, and the screen horizontal angle of view corresponding to the 16:9 frame ratio is only 22°. Therefore, it is recommended that the screen size should be larger when there are more seats. A wide screen with a 2.35:1 aspect ratio for a wider horizontal viewing angle.
6. Added value (C') of line of sight super high value (C=0.12m)
The added value of the line of sight super high value refers to the intersection of the line of sight of the rear view viewer's viewing point and the vertical line of the front row of the audience, and the height difference between the eyes of the front row of viewers minus 0.12 m (the line of sight is super high).
The additional value (C') of GB/T 21048-2007 for the super high value of sight (C=0.12m) is: the five-star cinema should not be less than 0.00m, and the four-star cinema should not be less than -0.02m. One-star to three-star cinemas should not be less than -0.04m. The value is only less than 0.00m, which can ensure that the rear view of the audience is not obscured by the front audience.
Therefore, the specification clause 3.1.6 sets the additional value (C') of the line of sight ultra-high value (C = 0.12 m) to be not less than 0.00 m.
This is a side view with a 120-inch 16..9 format than a high-definition screen or a 150-inch 2.35..1 format-wide screen. The screen height is 1.49m, which is the most common layout of the current audio-visual room. In this picture, the sofa seat The row spacing of the chair is 1.5m, the closest line of sight is 3.725m, which is 2.5 times the height of the screen, the farthest viewing distance is 5226m, which is 3.51 times of the screen height, the height of the viewpoint is 0.85m, and the second row of sofa seats is 0.25 higher than the first row. m, according to the standard sitting posture of the human sofa, the eye is designed to be 1.05m from the ground, and the line of sight is increased by 0.125m. Sight super high value added value (C') = line of sight increase value - line of sight super high value = 0.125 - 0.120 = 0.05m. This design ensures that the second row of viewers' eyes will not be obscured by the first row of viewers.
7. Maximum viewing angle
The maximum viewing angle refers to the angle formed by the line of sight of the center row of the audience in the first row to the center point of the upper edge of the highest screen.
GB/T 21048-2007 national standard for five-star cinemas, the maximum viewing angle should not be greater than 40 °, should not be greater than 45 °.
However, this maximum viewing angle is too large for a private theater. When using a screen with a diagonal of 120 inches or more and a 16:9 aspect ratio, or a wide screen with a diagonal of 150 inches or more and a 2.35:1 aspect ratio, if the closest line of sight is 2.0 times the height of the screen. When the first row is a semi-recumbent sofa seat, the height of the eye to the ground when the human body is sitting is 0.95m. The maximum viewing angle is 27°, and the vertical angle defined by THX is 15 °, the vertical viewing angle refers to the angle formed by the viewer's view of the center point of the screen and the eye level.
Therefore, the specification 3.1.7 clause modifies the maximum viewing angle to be no more than 27°, corresponding to THX specifying a vertical viewing angle of no more than 15°.
This is a side view with a 180-inch 16..9 format than a high-definition screen or a 225-inch 2.35..1 format-wide screen. The screen height is 2.24m, which is basically the limit layout of the current large private theater. In the figure, the line of sight of the first row of seats is 4.48m, which is 2.0 times of the height of the screen, and the height of the viewpoint is 1.0m. According to the standard sitting posture of the human body sofa, the distance from the ground is 1.05m. The maximum viewing angle is 26°, and the vertical angle of view corresponding to THX is 13°. If the front row is in a semi-recumbent sitting position with a sofa seat and the eye is 0.95m from the ground, the maximum viewing angle is 27°, corresponding to THX. The vertical viewing angle is 15°. This is why the specification requires that the viewpoint height be no more than 1.0 m and the closest line of sight is not less than 2.0 times the screen height.
Second, the projector technical conditions
Specification Clause 3.2 has established requirements for projector physical pixels, image adjustment functions, program source video formats, and video input interfaces to meet the minimum requirements for Blu-ray 3D and HDTV 3D video projection.
The physical pixel only specifies 1920×1080, but it does not specify the actual resolution is also 1080p. This mainly considers that some 3D projectors can replay 1080p/24Hz frame-packed 3D format video, although the physical pixel number reaches 1920×1080. The resolution of the 3D projection is only 720p.
Third, the optical index of the projection system
Curtain center brightness
2D screen center brightness, GB/T 21048-2007 national standard for five-star cinemas is (55 ± 7) cd / m2 or (16 ± 2) fL, GF (2004) 1036 "film digital screening temporary The technical requirements shall not be lower than 41 cd/m2, that is, 12 fL, and the DCI shall be (14 ± 3) fL.
As for the brightness of the 3D screen center, because the 3D equipment is subject to technical conditions and the light loss is large, SMPTE will not be lower than 4.5fL as the recommended value, but the existing cinema equipment in domestic cinema cannot perform the standard of 3D brightness 4.5 fL, so China The film research institute has compromised the domestic screening level, recommending 3D brightness as 12cd/m2 or 3.5fL.
Therefore, the specification clause 3.3.1 sets the 3D brightness to be less than 4.5fL (16cd/m2) and not less than 3.5fL (12cd/m2). The 2D brightness should not be lower than 16fL (55cd/m2) and should not be lower than 12fL (41cd/m2). At the same time, it is recommended to replace the projector bulb when the brightness of the screen center is lower than 65% of the above minimum value.
2. Reflective color temperature of the screen
GB/T 21048-2007 national standard on the film screen reflective color temperature is not to be less than 5000K, should not be higher than 5800K, this indicator is derived from the ISO 2910-1990 international standard (5400 ± 400) K, but the revised ISO 2910- The 2007 international standard has raised the reflective color temperature of the screen to (5800±400)K, and it is predicted to increase to (6100±400)K again after the revision, which is 5700~6500K.
The DCI standard requires that the chromaticity of the digital cinema projector be corrected and adjusted. The white CIE chromaticity coordinate value of the projection system is x=0.3140, y=0.3510 (corresponding to the color temperature of 5400K), and the error value must not exceed ±0.006.
Guangfa Jizi [2004] No. 1036 "Temporary Technical Requirements for Film Digital Screening" stipulates that the white CIE chromaticity coordinate value is also x=0.3140, y=0.3510, and the screen error value for the width of 8m or more shall not exceed ±0.01, for the width of 8m and 8m The following screen allowable error values ​​must not exceed ±0.05 (equivalent to a permissible color temperature error of ±400K).
The color of the Blu-ray disc adopts the D65 standard of the HDTV, and the white CIE chromaticity coordinate value is x=0.3127, y=0.3290, and the corresponding color temperature is 6504K.
If the projector is a mid-to-high end product with CMS color adjustment function, the white CIE chromaticity coordinate value of 2D is adjusted to D65 by x=0.3127, y=0.3290 by software such as colorimetric sensor and CalMAN or HCFR. The error value is not More than ±0.01 or even no more than ±0.006 is completely ok.
However, mid-range and low-end projectors usually do not have CMS color adjustment function, and even in mid-to-high-end projectors, some parameters cannot be adjusted in 3D mode. It is difficult to adjust to D65, so this standard does not use measurement screen. The method of reflecting CIE chromaticity is to directly measure the reflective color temperature of the screen.
Therefore, the specification clause 3.3.1 sets the reflective color temperature of white light to (6500±400)K, should not be less than 6100K, should not be greater than 6900K, and is compatible with the color temperature of the Blu-ray standard and the ISO 2910-2007 international standard. If the brightness of the projection system is sufficient, you can lower the color temperature to get the color temperature of the 6500K Blu-ray standard, or lower it to get the color temperature of 6100K, so that the movie is more film-like and the skin color is better. In 3D mode, the projection system often has no margin of brightness, so the maximum color temperature can only be set to be less than 6900K. If it is exceeded, no obvious greenishness is allowed.
3. Other optical indicators
Others such as screen reflective black level, screen reflective color and screen reflective color (color saturation), are the scope of visual inspection, from the "Super HiVi CAST" Blu-ray Disc instructions, in order to make the observation more accurate, blue filter The film was changed to THX certified blue filter glasses.
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