| 摘要 |
It is arranged so that a summary of schematic images is promptly displayed even if a transmission speed is low. For that purpose, a numerical value indicating a reference resolution is substituted for a variable r. The current time is substituted for a variable t0, and data having a resolution of r is decoded. The current time is substituted for a variable t1, and a time period required for decoding processing is calculated. If there is no succeeding image, the process is terminated. On the other hand, if there is a succeeding image, the time period of the decoding processing (t1-t0) is compared with a reference time period Tref. If (t1-t0) exceeds Tref, the resolution is halved. If (t1 to) is equal to or less than Tref, (t1-t0) is compared with Tref/2. If (t1-t0) is less than Tref/2, the resolution is doubled. By thus changing or maintaining the resolution, the processing of the second step and the succeeding steps is repeated.
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