| 摘要 |
A camera is set up to survey an area of water, recording images of the whole area, or scanning it section by section. Each image is compared with a previous one of the same area, captured under the same ambient conditions in the past and selected from a library holding images of the area under many different ambient condition, all without pollution or contaminants affecting the surface signature. Alternatively, the comparison is made with a recent image, taken as part of a sequence. Image analysis software can determine if there are differences between the images indicative of pollution, such as by an oil slick, ad an alarm can then be raised to prompt more detailed investigation. The system can have applications to other environments where changes may be determined or at least need to be monitored. |
