Patent ID: 9147324
Filing Date: 2015-09-29
Classification: G07F,G07G

Abstract:
1. An apparatus comprising: at least one multi-dimensional optical sensing element with a predetermined field of view; control circuits coupled to the sensing element; and a storage unit coupled to the control circuits, wherein the control circuits obtain a background model of the field of view from the sensing element and store the background model in the storage unit, wherein the control circuits obtain a current image of the field of view from the sensing element and compare the current image with the background model in the storage unit, wherein, responsive to comparing the current image with the background model, the control circuits determine whether a transaction has been initiated, wherein, when the control circuits determine that the transaction has not been initiated, the control circuits update the background model in the storage unit with the current image, wherein, when the control circuits determine that the transaction has been initiated, the control circuits obtain a new current image of the field of view from the sensing element and compare the new current image with the background model in the storage unit, wherein, responsive to comparing the new current image with the background model or responsive to an indication that a predetermined timeout period has elapsed without being reset, the control circuits determine when the transaction has ended, wherein responsive to the determination that the transaction has ended, the control circuits determine whether the new current image includes evidence of tampering, wherein, when the control circuits determine that the transaction has ended and tampering is not detected, the control circuits update the background model in the storage unit with the new current image; and wherein the control circuits continuously update the background model when the control circuits are not engaged in a transaction.