Surveillance system and image signal processing apparatus

摘要

Herein disclosed is a surveillance system, comprises: a plurality of imaging units for respectively taking images of specific objects to transform the images into image signals; a plurality of terminal units for respectively displaying thereon the images and producing command signals each indicative of requiring one of the images to be taken by imaging units; an image signal processing apparatus for processing the image signals transformed by the imaging units and operating the terminal units to have the terminal units display the images from the imaging units with the command signals respectively produced by the terminal units; and the image signal processing apparatus including image signal selecting means for selecting one of the image signals from among the image signals respectively transformed by the imaging units; controlling means for controlling the image signal selecting means to allow the image signals to be sequentially selected by the image signal selecting means; image signal encoding means for encoding the image signals sequentially selected by the image signal selecting means to image data; image data compressing means for compressing the image data encoded by the image signal encoding means into compression data; compression data storing means for storing therein the compression data compressed by the image data compressing means; and transmitting means for transmitting to the terminal units the compression data stored by the compression data storing means with the command signals respectively produced by the terminal units.