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The Frei-Chen operator, sometimes called Frei and Chen operator, is used in image processing for edge detection. It was proposed by Werner Frei and Chung-Ching Chen, researchers at USC's Image Processing Institute, in 1977[1]. The idea is to use a set of orthogonal basis vectors related to distinctive image features, which enable the algorithm to extract boundary elements effectively.
- ^ Frei; Chung-Ching Chen (October 1977). "Fast Boundary Detection: A Generalization and a New Algorithm". IEEE Transactions on Computers. C-26 (10): 988–998. doi:10.1109/TC.1977.1674733. ISSN 0018-9340.