The videophone service has been a dream for a long time, but there have been several reasons that prevented the service from becoming a reality. These are 1) the available data transmission bit rates were not high eno...
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The videophone service has been a dream for a long time, but there have been several reasons that prevented the service from becoming a reality. These are 1) the available data transmission bit rates were not high enough, 2) there were no encoding algorithms suitable for error prone transmission environments, and 3) the signal processing power of LSIs was too low. However, with the start of third-generation mobile communication services and the development of relevant technologies, such obstacles have almost disappeared and products with videophone capability are already on the market. This paper describes a visual signal encoding algorithm that Fujitsu has developed for the MPEG-4 system and describes its effectiveness under error free and error prone conditions. On average, our algorithm showed a 1 dB higher picture quality and an 18% smoother motion compared to the simple MPEG-4. The new algorithm is called the reduced resolutionmethod.
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