Patent ID: 8300281

Claim:
A method for mapping a gap between image sensors, comprising: providing a calibrating device comprising: a pixel unit array comprising: a plurality of warp lines parallel to one another; and a plurality of weft lines parallel to one another, wherein each of said warp lines crosses each of said weft lines to define a plurality of pixel units all over said pixel unit array; and a pattern comprising some of said pixel units having a gray level different from a gray level of remainder said pixel units in said pixel unit array, wherein said pattern comprises a plurality of spaced bars parallel to one another and not parallel to said warp lines and said weft lines; obtaining a scanned image of said calibrating device; setting a comparison procedure comprising: utilizing a characteristic of said pattern to define a target pixel unit and a comparison pixel unit; counting a number of said target pixel units whose said gray levels are different than said gray levels of said comparison pixel unit to obtain a value; implementing said comparison procedure to said scanned image; and determining a gap size according to said value and storing a coordinate and said gap size relative to said calibrating device where said gray levels of said target pixel unit and said comparison pixel unit are different.