The research reported in this paper focuses on the modeling of Local Binary Patterns (LBPs) and presents an a priori model where\r\nLBPs are considered as combinations of permutations. The aim is to increase the understanding of the mechanisms related to the\r\nformation of uniform LBPs. Uniform patterns are known to exhibit high discriminative capability; however, so far the reasons for\r\nthis have not been fully explored.We report an observation that although the overall a priori probability of uniform LBPs is high,\r\nit is mostly due to the high probability of only certain classes of patterns, while the a priori probability of other patterns is very\r\nlow. In order to examine this behavior, the relationship between the runs up and down test for randomness of permutations and\r\nthe uniform LBPs was studied. Quantitative experiments were then carried out to show that the relative effect of uniform patterns\r\nto the LBP histogram is strengthened with deterministic data, in comparison with the i.i.d. model. This was verified by using an\r\na priori model as well as through experiments with natural image data. It was further illustrated that specific uniform LBP codes\r\ncan also provide responses to salient shapes, that is, to monotonically changing intensity functions and edges within the image\r\nmicrostructure.
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