Detection of Irregularities in Regular Dot Patterns

In this stu dy, a periodic imag e element stru ctu re, referred to as reg u lar dot pattern is defi ned. Two methods are introdu ced to detect irreg u larities in reg u lar dot patterns. In the experimental part the proposed methods are applied to detect missing elements, dots, from dig itiz ed H eliotest samples which are considered to form a reg u lar dot pattern. H eliotest assessment is u sed in the paper and printing indu stry to measu re printability of different paper g rades.