Detecting smoke and/or fire in rooms involves determining sum of image elements deviating from reference image by first threshold, generating alarm signal if sum reaches second threshold

摘要

The method involves detecting at least one image of the room, digitizing it and comparing it with a reference image, whereby the sum of the image elements deviating from the reference image by at least a first threshold value is determined and an alarm signal is generated if the sum reaches or exceeds a second threshold level. Independent claims are also included for the following: an arrangement for detecting smoke and/or fire in rooms.