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12 Science Manual – Using Video Images for Fisheries Monitoring

need more amps than your power source can supply over an acceptable period,

forget it! A summary of equipment power requirements is provided in Table 3.5.

Figure 3.2: Bank of leisure batteries powering video fish counting system

3.3 Lighting

The better the image, the more questions the data can answer (fish size, species

identification). The right lighting will make all the difference to image quality,

especially under turbid conditions, and will improve the performance of motion

detection or analysis software.

The lighting and camera configuration will depend on the dimensions and type of

pass, the information required from the counter (such as species, size), budget and

the availability of mains power. For example, the best camera and lighting array for

species identification is a sideways camera looking across a light panel on the bed of

the fish pass. However, this configuration will not work as well in turbid conditions as

a camera looking across to a light panel on the opposite wall. In all cases, it is

important to ensure that the quality of the light is good, that there is sufficient light but

not too much so as to cause the cameras to become over-saturated and that the

lighting is unlikely to affect fish movements.

Four suggested lighting options are:

• LIGHT PANELS (LED or fluorescent tube panels)

• LED ILLUMINATORS AND LAMPS

• FLOODLIGHTS

• FLUORESCENT TUBE LIGHTING

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Radiant DVMD1 Bedienungsanleitung Seite 20