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. 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.
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