| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that if motion pictures with caption is compressed in a compression system based on quantization in a frequency region where white of high luminance is used in many cases in order to heighten perceptivity in caption indication of motion pictures, picture quality of a total picture deteriorates compared with a case where there is no caption since mosquito noises tend to occur around characters, and bits concentrate to character parts. SOLUTION: The motion picture data are compressed in a motion picture compression circuit 113, composed with caption text data in a multiplexer 114, and sent to a user through a storage/transmission system 115. Received data by the user are separated to compressed picture data and caption data by a demultiplexer 116. The picture data are sent to a motion picture expansion circuit 117 through a signal line 120. The text data are sent to a caption superimposer 118 through a signal line 121, deployed to a bitmap text picture there, and superimposed on the motion picture expanded by a motion picture expansion circuit 117. COPYRIGHT: (C)2004,JPO&NCIPI
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