Funding for this research was provided by:
Putra Grant Scheme, Malaysia (9538100)
Received: 2 May 2019
Accepted: 11 October 2019
First Online: 2 December 2019
Ethics approval and consent to participate
: The use of human subject was approved by the committee in charge of Stirling database headed by Peter Hancock (ExternalRef removed) and Bosporus database headed by Prof. Bulent Sankur (ExternalRef removed). The informed consent to participate was obtained by written and signed.
: For the purpose of method demonstration, only subject with ID F1002 was visualized in the study who has indicated her consent by written and signed for publication on Stirling dataset; while no image was visualized on Bosphorus dataset.
: The authors declare that they have no competing interests.