Stereo vision systems have been employed for monitoring the size of fish reared in aquaculture production facilities. A time-synchronized method using audio records is used to synchronize stereo cameras consisting of two stand-alone underwater cameras. In this study, a time-synchronized video analysis was conducted on objects moving on an elliptical orbit rail to assess the influence of frame rate and shutter speed on the measurement accuracy of a stereo camera. A coverage rate was defined for the reconstructed moving object in the stereo images to assess the accuracy of measurement. The coverage increased at high frame rates and at high shutter speeds under a high frame rate. Although the shutter speed affects illuminance in the experimental space, a higher frame rate should be set when using a stereo camera. This study shows that frame rate is the most important factor when measuring a 3D image using a stereo camera, provided a suitable shutter speed is used.
