Patent ID: 9691143
Date: 2017-06-27
CPC Classifications: G06T,H04N

Claim:
1. An inspection apparatus comprising: a first portion which obtains optical image data of a pattern to be inspected, using an image sensor; a second portion which divides an inspection region into predetermined unit regions that together form the inspection region and, subsequent to the dividing, obtains, for each of the predetermined unit regions, a respective average of output values of the optical image data for the unit region, and creates a distribution map of average values in the inspection region based on the obtained average of output values for each unit region; a third portion which creates a shape distribution map from the distribution map of the average values and stores the created shape distribution map, the shape distribution map being a distribution map related to the shape of the pattern to be inspected; a fourth portion which obtains at least one of either a variation value or a deviation value of the output value of each pixel in the unit region; a fifth portion which compares at least one of either the variation value or the deviation value of the output value with a threshold value and determines whether or not there is a defect; a sixth portion which stores defect information indicative of the output value determined as a defect in the fifth portion; and a seventh portion which stores and analyzes a transition of shape distribution maps stored by the third portion and a transition of defect information stored by the sixth portion, the transition of shape distribution maps including transitions between shape distribution maps of a master pattern and daughter patterns created by the third portion at each production of the master pattern and the daughter patterns, and the transition of the defect information including transitions between defect information of the master pattern and the daughter patterns created by the sixth portion at each production of the master pattern and the daughter patterns, the daughter patterns being duplicates of the master pattern, wherein the first portion comprises a light source applying light to the pattern to be inspected and a lens focusing the light from the light source, transmitted through or reflected by the pattern to be inspected, on the image sensor, and a resolution limit determined by a wavelength of the light from the light source and the numerical aperture of the lens is a value that does not resolve the pattern to be inspected.