| 摘要 |
<p>Apparatus for detecting images, such as flames, comprises an image sensor (<B>10</B>), such as a video camera, and a radiation sensor (<B>14</B>) which views the same scene as the image sensor. The radiation sensor may be tuned to a specific IR wavelength, such as 4.4 micrometers, by the use of a filter (<B>16</B>), and produces a varying output dependent on the radiation received from the whole scene. Outputs from both sensors are fed to a central processing unit (<B>18</B>) where the video signal is image-processed to identify bright clusters. The varying size of a cluster is then compared or correlated with the varying signal from the radiation sensor to identify whether the cluster is one which represents a source of varying infra-red radiation or flame.</p> |
