Abstract— Facial expression has made significant progress in
recent years with many commercial systems are available for
real-world applications. It gains strong interest to implement a
facial expression system on a portable device such as tablet and
smart phone device using the camera already integrated in the
devices. It is very common to see face recognition phone
unlocking app in new smart phones which are proven to be hassle
free way to unlock a phone. Implementation a facial expression
system in a smart phone would provide fun applications that can
be used to measure the mood of the user in their daily life or as a
tool for their daily monitoring of the motion in phycology studies.
However, traditional facial expression algorithms are normally
computing extensive and can only be implemented offline at a
computer. In this paper, a novel automatic system has been
proposed to recognize emotions from face images on a smart
phone in real-time. In our system, the camera of the smart phone
is used to capture the face image, BRIEF features are extracted
and k-nearest neighbor algorithm is implemented for the
classification. The experimental results demonstrate that the
proposed facial expression recognition on mobile phone is
successful and it gives up to 89.5% recognition accuracy