Image monitoring system

Abstract

Abstract PURPOSE:To detect a change in an image, without delaying from a detection action by a sensor, by stopping an action for detecting a change in an image or invalidating an output detecting said change so as only to update a reference image when a sensor does not detect a change and executing the action for detecting a change in an image or validating the output detecting said change when the sensor detects a change. CONSTITUTION:An image comparator 7 detects the difference between a current image and the reference image corresponding to a corresponding image pickup camera 1. If the change is detected, the image whose change is detected is transmitted to an abnormality decision circuit 9 through a reference image update circuit 8. When the change is detected, the reference image update circuit 8 updates image data in a reference image frame buffer 6 with the currnet image as the reference image. This update is always executed even if the sensor 2 does not detect the change. The abnormality decision circuit 9 decides the size of the detected change, and if it exceeds a reference value, the circuit 9 decides that there is an abnormal change, generates a detection output and operates an alarm processing circuit 10. The output detecting the abnormal change is validated only when the detection signal of the sensor 2 is inputted.

Inventors

• 👤 Akira Yasuda
• 👤 晃 安田
• 👤 Hiroyoshi Yuasa
• 👤 湯浅　啓義
• 👤 Chikao Matsuo
• 👤 至生 松尾
• 👤 Masami Ono
• 👤 正己 大野

Bibliographic Details