Abstract
A code of integers into binary sequences is called a difference-preserving code (DP code) if it has the following two properties: 1) if the absolute value of the difference between two integers is less than or equal to a certain threshold, the Hamming distance between their codewords is equal to this value and 2) if the absolute value of the difference between two integers exceeds the threshold, then the Hamming distance between their codewords also exceeds this threshold. Such codes (or slight modifications thereof) have also been called path codes, circuit codes, or snake-in-the-box codes. This paper discusses the application of DP codes to pattern recognition and classification problems and presents a construction of efficient DP codes whose information content is asymptotically (in the length of codewords) of the order of theoretical upper bounds.
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