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From Stereoscopy to 3D HD Image:A Review of 3D HDTV Diffusion from the Perspective of Technology Adoption
Unformatted Document Text:  17 First technological challenge faced by the 3D HDTV diffusion is the limitation of bandwidth. It requires high bandwidth to deliver and receive 3D HD signals. Although the current technology can guarantee the delivery of high-quality 3D HD broadcast in the United States, content providers may not send 3D signals in full HD format because of the bandwidth limitation. Technically, live 3D HD broadcast can be delivered through two fiber-optic paths without compressing the two 1.5 gigabit-per-second signals (one signal for left eye, the other for right eye), and can also be delivered via satellite after MPEG-4 encoder compresses the signals and creates two 20 Mbps streams (Dickson, 2008). However, “Frame compatibility” approach is used when sending 3D signals to the users. “Frame compatibility” technique combines the two frames (one frame for each eye) into one frame and makes a 3D HD signal look like a 2D HD signal (Ellis, 2010). When encoding two-frame signals into one-frame signal, each frame can only offer less than “full resolution” to each eye (Ellis, 2010), although the reduced resolution can be outweighed by the contrast and brightness to help viewers perceive sharpness with the result that the viewers won’t notice the resolution deduction (Taub, 2010). Consumers may still feel satisfied with the quality of the 3D images even if the resolution of the 3D content is not in full HD. The approach used to deliver 3D signals by compromising HD resolution should be questioned, especially when 3D HDTV is still in its early days. Although all the 3D HDTV sets in the market support decoding this “frame compatibility” type of 3D signal (Ellis, 2010), it is not ethical to deliver 3D HD signal with less-than-HD resolution. Even though the 3D HD signals are delivered with full resolution, consumers need high bandwidth to receive the signals. If high bandwidth costs too much, consumers may think it is not worth it to spend money on the bandwidth, especially when there are not many 3D HD

Authors: Song, Xu.
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17
First technological challenge faced by the 3D HDTV diffusion is the limitation of
bandwidth. It requires high bandwidth to deliver and receive 3D HD signals. Although the
current technology can guarantee the delivery of high-quality 3D HD broadcast in the United
States, content providers may not send 3D signals in full HD format because of the bandwidth
limitation. Technically, live 3D HD broadcast can be delivered through two fiber-optic paths
without compressing the two 1.5 gigabit-per-second signals (one signal for left eye, the other for
right eye), and can also be delivered via satellite after MPEG-4 encoder compresses the signals
and creates two 20 Mbps streams (Dickson, 2008). However, “Frame compatibility” approach is
used when sending 3D signals to the users. “Frame compatibility” technique combines the two
frames (one frame for each eye) into one frame and makes a 3D HD signal look like a 2D HD
signal (Ellis, 2010). When encoding two-frame signals into one-frame signal, each frame can
only offer less than “full resolution” to each eye (Ellis, 2010), although the reduced resolution
can be outweighed by the contrast and brightness to help viewers perceive sharpness with the
result that the viewers won’t notice the resolution deduction (Taub, 2010). Consumers may still
feel satisfied with the quality of the 3D images even if the resolution of the 3D content is not in
full HD. The approach used to deliver 3D signals by compromising HD resolution should be
questioned, especially when 3D HDTV is still in its early days. Although all the 3D HDTV sets
in the market support decoding this “frame compatibility” type of 3D signal (Ellis, 2010), it is
not ethical to deliver 3D HD signal with less-than-HD resolution.
Even though the 3D HD signals are delivered with full resolution, consumers need high
bandwidth to receive the signals. If high bandwidth costs too much, consumers may think it is
not worth it to spend money on the bandwidth, especially when there are not many 3D HD


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