| 摘要 |
A diagnostic system includes an image acquisition unit (1), an image coding and recording unit (2) and an image information retrieval unit (9). The image acquisition unit (1) acquires moving-image information relating to an object (3) to be examined which information represents a series of images that succeed one another in time. The image coding and recording unit (2) includes a first coding unit (4) for converting the series of images into a first data stream in accordance with first conversion rules optimised for the compression of moving-image information, and a second coding unit (6) for converting the series of images into a second data stream in accordance with second conversion rules optimized for the compression of still-image information. The average amount of information per coded image is smaller for the first coding unit (4) than for the second coding unit (6). The image coding and recording unit (2) further includes a recording unit (7) for recording the first and the second data streams on one and the same record carrier. The image information retrieval unit (9) includes a read unit (10) for reading the data streams from the record carrier (8), a control unit (17), a first decoding unit (12) for recovering the image information from the first data stream, a second decoding unit (13) for recovering the image information from the second data stream, and an image output unit (16) for supplying recovered images to an image reproducing device. The control unit (17) controls the read unit (10), the first and the second decoding units (12 and 13), and the image output unit (15). In a first mode the readout a part of the recorded first data stream, the recovery of the corresponding moving-image information by the first decoding unit and the supply of recovered moving-image information to an image reproducing unit (14) are effectuated. In a second mode the read-out of a selected part of the second data stream, the recovery of the corresponding still-image information by the second decoding unit (13) and the supply of this recovered image information to the image reproducing unit (14) are effectuated.
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