Abstract

Thinning algorithms based on morphological hit/miss transforms are good at extracting the skeletons of closed-loop objects in noisy images. However, many skeletal legs are generated usually with unnecessary lengths, and the removal requires much time. This paper investigates fast removal algorithms, and provides a formal performance analysis for algorithms with different arrangements of leg shortening (trimming) templates. First, the use of three algorithms is compared for different image conditions based on probability analysis. Second, to obtain prior information to determine the fastest algorithm, a reduced image is used. Finally, based on this information, a fuzzy-logic approach is used to determine the arrangement of templates. Also, procedures are proposed to form fuzzification functions for the leg properties. An illustration of applying this fuzzy inference mechanism to real-scene images is also included.

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