IEEE Consumer Electronics Magazine - April 2017 - 112
Viewing Distance (ft)
20
15
10
5
HD Viewing Distances
4K UHD Viewing Distances
0
40
45
50
55
60 65
70
75
TV Screen Diagonal Size (in)
80
85
FIGURE 4. A graph that illustrates the comparison of optimal viewing distance for HD and
4K UDH versus display diagonal size. (Courtesy of Coughlin Associates.)
the distance of the viewer, percep-
tions of color and HDR seem to make
a difference to viewers for all size
screens and reasonable distances from
a screen. Let's look at the way modern
display devices provide colors and
dynamic range. In 1931, the Interna-
tional Commission on Illumination
(CIE) defined a quantitative relation-
ship between physical colors (light
wavelengths) and human color vision.
This resulted in a chromaticity diagram
that can be used to specify how the
human eye will experience light with a
given wavelength as a particular color.
This relationship defines the resulting
color space.
Figure 5 shows the CIE 1931 color
space, the UHDTV (Rec 2020) color space
in the outer triangle, and the HDTV
(Rec 709) color space in the inner trian-
gle. The x and y axes are derived from
the brightness and chromaticity of each
color. The illuminant D65 point is
defined as white in both of these display
color spaces. The numbers on the out-
side of the locus of the CIE 1931 color
space are the wavelength of the light
corresponding to that color.
Rec 2020 has a WCG than Rec 709
and thus would show more saturated
richer colors. Some types of displays
can show a greater gamut of colors
within the defined color space. Organic
light-emitting-diode (LED) displays
and quantum dot displays provide rich-
er colors than most LED displays. Note
Table 2. Some 4K and beyond camera codecs [3].
Camera/Codec
Resolution
(Width × Height)
Frame Rate (fps)
Data Rates
(Mb/s)
Storage Capacity/
Hour (GB/h)
Panasonic GH4 4K
4,096 × 2,160
24
100
45
Red 4K (6:1)
3,840 × 2,160
24
432
194
XAVC 4K
4,096 × 2,160
30
300
135
KineMINI 4K CinemaDNG
4,096 × 2,160
24
332
150
AVC-Ultra 4K
4,096 × 2,160
24
400
180
Canon 1DC MJPEG 4K
4,096 × 2,160
24
500
225
ProRes 422 4K
3,840 × 2,160
60
489
220
KineMAX 6K CinemaDNG
5,760 × 3,240
24
672
302
ProRes 422 HQ 4K
3,840 × 2,160
60
734
330
Sony F5/55 RAW 4K
4,096 × 2,160
25
1,000
450
ProRes 4444 4K
3,840 × 2,160
60
1,100
495
BlackMagic 4K PL RAW
4,000 × 2,160
24
2,120
954
RED 6K WS (4:1)
6,144 × 3,160
24
1,160
552
ProRes 4444 XQ 4K
3,840 × 2,160
30
1,650
742
Sony F65 RAW SQ 4K
4,096 × 2,160
24
2,000
900
Canon RAW 4K (12-b)
4,096 × 2,160
30
2,664
1,199
Phantom Flex 4K RAW
4,096 × 2,160
938
102,400
46,080
112 IEEE Consumer Electronics Magazine
^
APRIL 2017
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