| 摘要 |
<p>The invention relates to a ground marking indicative of a trip hazard that can be detected by sight impaired people, and may comprise a code marking 12 associated with steps, such as a kerb. The marking may indicate whether it is a step up or a step down, and how high the step is, and may comprise a van Dyke or zig-zag marking 12a. Different colours may be used to indicate whether the marking is on a step or a riser. A simple code expressed in two contrasting colours and comprising simple geometric shapes may be used. A machine vision system, such as a smartphone (31, fig 3) having a built-in camera, may be provided that recognizes the ground marking, and which has an app that analyses an image of the camera and gives an audible or other indication of the presence of coded information.</p> |
