# Check that the camera is set up properly

Aim

If a digital camera is not setup properly, you will get dropped video frames which results in either Missed samples or Interpolated samples in EthoVision XT.

Prerequisites

▪You have followed the steps in Camera Installation to connect and configure the camera

▪You have created an experiment in EthoVision XT

▪You have made the Arena Settings. This step is necessary to open the Detection Settings.

Procedure

1.In the EthoVision XT experiment, select Setup > Detection Settings > New.

2.Make sure that the video window shows the live camera image.

3.In the Detection Settings pane, under Smoothing, set Dropped frame correction to Off.

4.Locate the Detection Performance pane.

5.Check the value of Missed samples. If the percentage of missed samples is low, say less than 1%, then the camera is set up properly.

If the percentages is higher, there may be an issue with the camera.

6.You have a few options:

▪For GigE cameras: check that the exposure time is not too high for the set frame rate. See Adjust the camera exposure time

▪Reduce the video resolution, the frame, or both.

▪The Ethernet board may not be set up properly. See Settings of the Ethernet board

▪See the Troubleshooting: Camera

Notes

▪The value of Subject not found is not related to the camera setup. It shows how often the software is not able to find a subject in the arena. If the arena is empty, the value grows to 100%.

▪The Dropped frame correction set to Off enables you to see if EthoVision XT can cope with the actual camera frame rate without missing samples.

▪If the camera is set up properly and still the number of Missed samples is high (e.g. > 5%), you can set Dropped frame correction to On. However, the software interpolates samples to compensate for the missing video frames. See Dropped frames correction