The calibration screen is used when the Posture Scan software is activated. It serves to ensure that scans are performed in a standardised way, and as consistently as possible. The software automatically checks the environment, the performance of the computer, that the sensor is connected and positioned correctly, and the frame rate of the sensor. Below is a list of factors affecting performance:
|Check Point||Optimum condition||Reasoning|
|Floor, lighting and walls||On the screen: the floor should appear green, with no empty areas or yellow patches.||This is some text in a paragraph.The quality of the signal coming back to the sensor is very important, and this sometimes depends on the floor. The floor should be flat, even, and non-reflective. This is very important for accurate tracking and measurement. Bright lights shining directly into the sensor, reflective walls such as mirrors or highly varnished walls should be avoided. Click on the ‘dark cloud’ in Movement Lab to check the scan quality after a recording.|
|Sensor position||Both the feet and the head should be visible on the screen. Approximately ⅓ of the bottom of the screen should be occupied by the floor.||A green square and green skeletal will appear on the screen when the test person stands at a suitable distance from the sensor. Adjust the tilt of the sensor and the stance position of the test person to identify the optimal set-up.|
|Power plan||Ensure that the computer is in ‘Performance’ mode and preferably plugged into the mains supply.||3D graphics is quite demanding on the computer processor and the graphics card. The software will automatically set the local computer to High Performance mode. This leads to faster battery consumption, and access to maximal processing power.|
|Microsoft Kinect sensor||Sensor is detected.||If the Kinect sensor is connected properly, the Microsoft Kinect sensor will be shown as ‘available’. If not, please check the connection of the sensor and that the power is on. The sensor must be connect to the USB 3.0 port of the PC. USB 2.0 is not compatible.|
|Frame rate||The optimal frame rate is between 28-30 frames per second(fps).||Maximising frame rate improves the quality of the data used for measurements. The frame rate can drop if the environment is not optimal - poor lighting, poor flooring, wrong sensor angle. In some cases, the graphic card driver may need updating. Ensure the computer meets the minimal requirements. Please also see the FAQ topic to low frame rate.|
|Sensor positioning||Sensor is horizontal, sits at a height of 80cm-120cm and is slightly angled down.||The software measures and reports the positioning of the sensor. The sensor must be adjusted manually. Avoid touching the front of the sensor and leaving blemishes on the lenses.|
When all of factors listed have a tick next to them, then the setup is satisfactory for scanning. Press OK to continue with the semi-automated scanning.
One or all of the circles are not ticked please make appropriate adjustments until optimal conditions are met.
Conditions change during or between scans, it is advisable to re-calibrate the system. Press ‘Esc’ to open the calibration screen, and check the calibration factors.
In addition to calibration at setup, the software calibrates again when an individual enters the scan area, prior to the onset of each scan. The characteristics of the scan are logged by Qinematic for internal use and software development purposes.