Patent ID: 8467048

Claim:
An inspection apparatus which inspects a defect of a sample, comprising: an illumination system which forms a first illumination area on a surface of said sample and a second illumination area of said surface; a detection system which has a first field of view for said first illumination area and a second field of view for said second illumination area though an objective lens, and which includes a first detector corresponding to said first field of view and a second detector corresponding to said second field of view, said first detector being configured to output a first scattered signal and said second detector being configured to output a second scattered signal; and a processing system which processes at least one of said first scattered signal and said second signal, wherein said processing system includes a first gray level changing unit which changes a first gray level of said first scattered signal, and a second gray level changing unit which changes a second gray level of said second scattered signal; and a first normalizing filter for said first scattered signal, and a second normalizing filter for said second scattered signal.