Patent ID: 8692214

Claim:
A method for forming a plurality of images on a sample for categorizing defects on said sample, wherein said sample comprises a first pixel column and a second pixel column comprising: moving said sample continuously in a direction perpendicular to said first pixel column and said second pixel column, and from said first pixel column to said second pixel column; line-scanning said first pixel column with a charged particle beam under a first photo-current condition; line-scanning said first pixel column again with said charged particle beam under a second photo-current condition, wherein said second photo-current condition is different from said first photo-current condition; line-scanning said second pixel column with said charged particle beam under said first photo-current condition; and line-scanning said second pixel column again with said charged particle beam under said second photo-current condition; wherein said sample is moved continuously at a speed allowing scanning processing to be done on each pixel column under different photo-current conditions.