  Various methods have been proposed for authentication, including password or
pattern drawing, which is clearly visible on personal electronic devices.
However, these methods of authentication are more vulnerable, as passwords and
cards can be forgotten, lost, or stolen. Therefore, a great curiosity has
developed in individual authentication using biometric methods that are based
on physical and behavioral features not possible to forget or be stolen.
Authentication methods are used widely in portable devices since the lifetime
of battery and time response are essential concerns in these devices. Due to
the fact that these systems need to be fast and low power, designing efficient
methods is still critical. We, in this paper, proposed a new low power and fast
method for pupil segmentation based on approximate computing that under trading
a minor level of accuracy, significant improvement in power assumption and time
saving can be obtained and makes this algorithm suitable for hardware
implementation. Furthermore, the experimental results of PSNR and SSIM show
that the error rate in this method is negligible.
