| 摘要 |
In coding by use of DCT transform and motion compensation, frame memories for each storing an input image for each of different shooting places are provided, and at the start of pan-tilt-zoom motion of camera, an input image to be coded is switched from an input image from the camera to a past input image in a shooting place after the end of the pan-tilt-zoom motion, stored in the frame memories. Or in addition to frame memories for storing decoded images by local decoding, a reference image memory for storing a decoded image for each of shooting places of surveillance target as a reference image, read from the frame memories, is provided so that, during camera switching, a decoded image used to detect motion vectors is switched from a decoded image of an input image to a past reference image in a shooting place after camera switching, stored in the reference image memory.
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