Monitor device

Abstract

Abstract PURPOSE:To decrease the malfunction of a monitor device by obtaining a differential image between the present image of the monitor device which detects the presence or absence of intruders and a reference image, binarizing the output of a calculation means that obtained the mean value of picture elements and the output of a differential value memory with a prescribed threshold value, and deciding a change when the calculated result of picture elements is larger than the prescribed value. CONSTITUTION:A image signal which picks up an alarm area is outputted from an image pickup means 1 and undergoes A/D conversion 2. Then the normal image of the alarm area is stored in a reference image memory 3. While a differential means 4a obtains a differential image of a change component between a present image and a reference image. A 1st binarizing means 5a binarizes the differential image with the prescribed threshold value and the differential image is stored in a differential image memory 8. An offset calculation means 9 uses the outputs of the memory 8 and the means 5a and calculates the differential means value of picture elements. Furthermore, an absolute value differential means 4b subtracts the offset from the differential image of the memory 8 to obtain the absolute value. This absolute value is binarized by a 2nd binarizing means 5b. When the output of the means 5b has a change larger than the prescribed value, a signal is outputted to an alarm means 7 from a calculation means 6.

Inventors

• 👤 Satoshi Furukawa
• 👤 聡 古川
• 👤 Chikao Matsuo
• 👤 至生 松尾
• 👤 Tei Satake
• 👤 禎 佐竹
• 👤 Masami Hisada
• 👤 久田　正美

Bibliographic Details