Some restriction such as nonconformities between skin and sensor materials, sensors displacement and low resolution were noticed due to the sensor location inside the shoe. With the development in technology, and pressure recording sensors, other elements such as pressure center, maximum pressure area, and pressure–time curve were examined. After that, sole geometrical characteristics such as distance and angle between each foot print pair, steps length and width have an important role in human verification. In initial studies, rubber and ink were used to record foot pressure images, and the distance between the big toe and hill were used as verification scale. Since walking consists of many complex movements, it could be said that foot pressure images and pressure distribution pattern are unique for each person and can be used as a biometric scale for identity verification. Studying this pressure could be useful in some fields including: patients motional and balance difficulties, diabetic foot wound treatment, insole design, etc. Foot pressure is an internal pressure which is created during daily motional activities or standing between foot and ground or any other supporting surface.
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