Patent ID: 7988293

Claim:
A method of employing an optical sensor to determine a property of an object, the method comprising: (a) illuminating the object with light from one or more light sources; (b) receiving light from the illuminated object; (c) producing a group of light spots from the received light; (d) qualifying a set of the light spots for use in determining a property of the object; and (e) determining the property of the object using the qualified set of light spots, wherein qualifying the set of light spots includes, for each light spot in the group of light spots: calculating a first calculated location of the light spot using a first calculation algorithm; calculating a second calculated location of the light spot using a second calculation algorithm different from the first calculation algorithm; and when a difference between the first and second calculated locations for the light spot is greater than an agreement threshold, excluding the light spot from the qualified set of light spots.