| 摘要 |
High contrast silhouette images of moving aquatic organisms against a brightly lit background are provided with an apparatus which comprises a tunnel with transparent top and front walls for confining the motion of aquatic organisms, retroreflective surfaces associated with the rear and bottom wall of the tunnel, a mirror, a camera, a light source and a camera support. Tunnel edges are provided with retroreflective surfaces to provide brightly lit borders to facilitate machine vision. Arrangements are described for determining organism size. |
