Patent ID: 8006905

Claim:
A system, comprising: a light source configured to illuminate a first area, wherein the first area includes at least an indicia to be read, and ambient light is present on and around the indicia; and a subsystem, wherein the subsystem comprises: a first sensor having a first active area; one or more additional sensors each having one or more second active areas, wherein the one or more additional sensors together have a total active area; a collection optics configured to focus an image: a first light reflected from the first area onto the first active area of the first sensor, wherein the first reflected light includes a first portion of ambient light and light reflected from the indicia, and the first active area converts the first reflected light to a first electric current, and a second portion of ambient light from the one or more additional areas near the indicia onto the one or more second active areas of the one or more additional sensors, wherein the one or more second active areas convert the second portion of ambient light to one or more second electric currents; and a first circuit configured to produce an output current by subtracting a sum of all the second electric currents times a multiplier from the first electric current, wherein the multiplier is based at least upon a ratio of the first active area and the total active area.