Patent ID: 6833862
Filing Date: 2004-12-21
Classification: H04N

Abstract:
A method for manufacturing a camera which connects to a computer, comprising:determining a vignetting effect of a first lens; installing said first lens in a first camera housing; determining a vignetting effect of a second lens; installing said second lens in a second camera housing; installing in each housing a photosensor array mounted behind said lens; coupling an analog processing circuit to each said photosensor array; coupling an analog to digital converter to each said analog processing circuit; coupling a digital processing circuit to an output of each said analog to digital converter, said digital processing circuit including a register for storing a single vignetting constant corresponding to a vignetting rating of said lens, and a correction circuit, coupled to said register, for adjusting a value of selected pixels according to a formula using said single vignetting constant and a set of pixel coordinates to scale the single vignetting constant based on a distance of the selected pixels from an approximately central pixel, to correct for vignetting of said lens; coupling a bus interface circuit to an output of each said digital processing circuit for connecting to a bus for transfer of data to said computer; storing a first vignetting constant in said register in said first camera housing, said first vignetting constant corresponding to said vignetting effect of said first lens; storing a second vignetting constant in said register in said second camera housing, said second vignetting constant corresponding to said vignetting effect of said second lens.