Validity and reliability of head posture measurement using Microsoft Kinect

Aims To investigate the validity and reliability of Microsoft Kinect-based head tracker (KHT) for measuring head posture. Methods Considering the cervical range of motion (CROM) as a reference, one-dimensional and three-dimensional (1D and 3D) head postures of 12 normal subjects (28–58 years of age; 6 women and 6 men) were obtained using the KHT. The KHT was validated by Pearson's correlation coefficient and intraclass correlation (ICC) coefficient. Test–retest reliability of the KHT was determined by its 95% limit of agreement (LoA) with the Bland-Altman plot. Face recognition success rate was evaluated for each head posture. Results Measurements of 1D and 3D head posture performed using the KHT were very close to those of the CROM with correlation coefficients of 0.99 and 0.97 (p<0.05), respectively, as well as with an ICC of >0.99 and 0.98, respectively. The reliability tests of the KHT in terms of 1D and 3D head postures had 95% LoA angles of approximately ±2.5° and ±6.5°, respectively. Conclusions The KHT showed good agreement with the CROM and relatively favourable test–retest reliability. Considering its high performance, convenience and low cost, KHT could be clinically used as a head posture-measuring system.

[1]  Philippe Poignet,et al.  Joint angle estimation in rehabilitation with inertial sensors and its integration with Kinect , 2011, 2011 Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[2]  C B Preston,et al.  The development of instrumentation for the dynamic measurement of changing head posture. , 1991, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[3]  D. Coats,et al.  Accuracy of clinical estimation of abnormal head postures. , 2004, Binocular vision & strabismus quarterly.

[4]  Lin Liang,et al.  AAM based face tracking with temporal matching and face segmentation , 2010, 2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition.

[5]  J D Young,et al.  Head posture measurement. , 1988, Journal of pediatric ophthalmology and strabismus.

[6]  Kwang Gi Kim,et al.  Nintendo Wii remote controllers for head posture measurement: accuracy, validity, and reliability of the infrared optical head tracker. , 2012, Investigative ophthalmology & visual science.

[7]  Rafael Muñoz-Salinas,et al.  Multi-camera head pose estimation , 2012, Machine Vision and Applications.

[8]  R. Hertle,et al.  Horizontal rectus muscle tenotomy in children with infantile nystagmus syndrome: a pilot study. , 2004, Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus.

[9]  W E KREWSON,et al.  Ocular torticollis. , 1957, The American orthoptic journal.

[10]  Zhengyou Zhang,et al.  3D Deformable Face Tracking with a Commodity Depth Camera , 2010, ECCV.

[11]  R. Hertle,et al.  Gaze-dependent and time-restricted visual acuity measures in patients with Infantile Nystagmus Syndrome (INS). , 2005, American journal of ophthalmology.

[12]  B J Kushner,et al.  The usefulness of the cervical range of motion device in the ocular motility examination. , 2000, Archives of ophthalmology.

[13]  V F Ferrario,et al.  Head posture and cephalometric analyses: An integrated photographic/radiographic technique. , 1994, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[14]  Linda Denehy,et al.  Validity of the Microsoft Kinect for assessment of postural control. , 2012, Gait & posture.

[15]  Yao-Jen Chang,et al.  A Kinect-based upper limb rehabilitation system to assist people with cerebral palsy. , 2013, Research in developmental disabilities.

[16]  Paolo Nucci,et al.  A multi-disciplinary study of the ocular, orthopedic, and neurologic causes of abnormal head postures in children. , 2005, American journal of ophthalmology.

[17]  Eric S Hald,et al.  Development and validation of a digital head posture measuring system. , 2009, American journal of ophthalmology.

[18]  Zhengyou Zhang,et al.  Microsoft Kinect Sensor and Its Effect , 2012, IEEE Multim..