Patent ID: 7113630

Claim:
A method of correcting PICA image data, comprising: a. Acquiring optical image data of a target having identifiable optical-image features, b. Acquiring PICA image data of the target having identifiable PICA-image features corresponding to the optical-image features, c. Preparing optical-image-background data by applying gray-scale erosion to the optical-image data, d. Subtracting optical-image-background data from the optical-image data to produce flattened-optical-image data have lesser intensity gradients than the optical-image data, e. matching PICA-image features with corresponding features of the flattened-optical-image data, and f. Calculating from matched PICA-image features and optical-image features a set of coefficients defining relationships between observed positions of PICA-image features and optical-image features.