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Example text

Once the operation of the human visual system (HVS) is understood, it will be clear that, to obtain realism, imaging quality has to meet adequate criteria in a number of domains. These include at least contrast, noise level, colour accuracy, static and dynamic resolution, flicker, and motion portrayal. Once these topics are appreciated, it then becomes possible to analyse today’s popular imaging technologies to see why they all look different and to suggest a way forward to a new level of realism that will be expected in applications such as simulators and electronic cinema.

Packet multiplexing overcomes these limitations. The multiplexer must switch between different timecompressed signals to create the bitstream and this is much easier to organize if each signal is in the form of data packets of constant size. 13 shows a packet multiplexing system. Each packet consists of two components: the header, which identifies the packet, and the payload, which is the data to be transmitted. The header will contain at least an identification code (ID), which is unique for each signal in the multiplex.

This is accomplished by the configuration shown here. Samples are written into one RAM at the sampling rate by the write clock. When the first RAM is full, the switches change over, and writing continues into the second RAM whilst the first is read using a higher-frequency clock. The RAM is read faster than it was written and so all of the data will be output before the other RAM is full. This opens spaces in the data flow, which are used as described in the text. 11 Time compression is used to shorten the length of track needed by the video.

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