Inter-videotex conversion from Prestel to Captain

The authors describe a data syntax conversion method from CEPT (European standard) to Captain PLPS (Japanese standard) to permit interconnections between videotex services. They discuss the conversion results when an overseas videotex center, in particular, the Prestel (alpha-mosaic version in CEPT standard) center in the United Kingdom, is accessed from a Captain terminal using the described method. By the conversion method presented, the Captain terminal can access CEPT videotex centers as a CEPT terminal. There are two essential features. The first is that text and graphics data are converted into photographic information on Captain terminals to absorb differences of character size and graphic display. The second is that a color replacement method based on the major colors in a coloring unit is used to solve the problem of differences of coloring units between the two videotex services