Patent ID: 6671423
Filing Date: 2003-12-30
Classification: G06T,H04N

Abstract:
A method of suppressing geometric distortions in an image space obtained by imaging a sample space to be measured, comprising the steps of:preparing a reference space correspondingly located to a sample space to be measured, said reference space including a plurality of reference graphics and having previously known coordinate value positions of every graphic cores in said reference graphics and of a reference center defined as a graphic core of the whole reference graphics in said reference space; superimposing a transcription center in an image space on the reference center in said reference space, said image space being obtained by imaging said sample space to include a plurality of imaged graphics corresponding to said plurality of reference graphics, the transcription center being defined as a graphic core of the whole imaged graphics in said image space; executing a primary affine transformation to transform a group of transcription graphic cores consisting of graphic cores in said plurality of imaged graphics, core-by-core, on a group of reference graphic cores consisting of graphic cores in said plurality of reference graphics; performing a primary spatial division to divide said reference space into a plurality of primarily divided spaces; deriving an estimation of distortion for each of said primarily divided spaces from a positional error between each transcription graphic core after said primary affine transformation and the corresponding reference graphic core; classifying said primarily divided spaces into in- and out-of-tolerance divided spaces having estimations of distortion falling inside and outside a predetermined tolerance; executing a secondary affine transformation for said out-of-tolerance divided spaces to transform a group of transcription graphic cores in the corresponding image space on a group of reference graphic cores in said out-of-tolerance divided spaces; performing a secondary spatial division to divide said out-of-tolerance primarily divided spaces into a plurality of secondarily divided spaces after said primary and secondary affine transformations; and repeating affine transformations and spatial divisions for said out-of-tolerance divided spaces until said estimations of distortion fall inside said predetermined tolerance.