Television-based alarm system

摘要: A television-based alarm system comprises a plurality of television cameras connected in time-multiplex mode to set discriminators. The discriminators are sequentially receive the video signals from cameras, arrangement being such that each discriminator receives signal predetermined camera. Each is adapted generate pulse upon occurrence characteristic picture content corresponding particular type event field view discriminating functions differ so different types may be detected by various cameras. pulses generated at any time camera logically combined with masking which defines portion or portions not required. provided and these sequence then coupled second signal. In case first define series horizontal vertical stripes for detecting movement direction restrict part only total possible view. After logical coupling remaining evaluated according criterion an