— A depth/range camera is able to return images like an
ordinary camera, however, instead of color, each pixel value
represent a particular distance correspond to a point in a real
world. Recently, the Microsoft Kinect Sensor is a popular
measurement tool due to its ability to provide length
measurement, volume measurement, and motion measurement in
Biomedical Application. Every researcher wants to know
accuracy, precision and reliability of Kinect sensor depth
distance performance. This paper presents an investigation of the
quality of depth data obtained by Kinect sensor. Based on Kinect
Sensor’s specification by Microsoft a theoretical accuracy,
precision and reliability analysis is presented, which provides an
insight into the factors influencing the accuracy of the data.
Experimental results show that the absolute mean percentage
error of depth measurement increases with increasing distance to
the sensor, and ranges from a few millimeters up to about 40mm
at the maximum range of sensor. The standard deviation at
different distances of plane to the sensor is provided a similar
quadratic curve in precision. The reliability of Kinect Sensor is
evaluated by using Kuder-Richardson formula 20 shown that
0.76 in reliability. The accuracy, precision and reliability of depth
distance is important and beneficial to biomedical application
due to the depth perception is required to determine the 3D
estimation pose in human motion application.