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Image position error detection technique
A method for detecting image position errors, includes forming a first pattern with a symbol embedded therein and a second pattern which, when superpositioned on the first pattern, exposes the symbol if the misalignment between the first and second patterns exceeds a position error tolerance. The symbol is perceivable with the unaided eye even if the misalignment is imperceivable to the unaided eye. The misalignment or mis-registration is quantifiable in two dimensions to enable correction of the error.two images patterns need superimposed accurate aligment registration

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