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This paper presents a novel setup for automatic visual inspection of cracksin ceramic tile as well as studies the effect of various classifiers andheight-varying illumination conditions for this task. The intuition behind thissetup is that cracks can be better visualized under specific lightingconditions than others. Our setup, which is designed for field work withconstraints in its maximum dimensions, can acquire images for crack detectionwith multiple lighting conditions using the illumination sources placed atmultiple heights. Crack detection is then performed by classifying patchesextracted from the acquired images in a sliding window fashion. We study theeffect of lights placed at various heights by training classifiers both oncustomized as well as state-of-the-art architectures and evaluate theirperformance both at patch-level and image-level, demonstrating theeffectiveness of our setup. More importantly, ours is the first study thatdemonstrates how height-varying illumination conditions can affect crackdetection with the use of existing state-of-the-art classifiers. We provide aninsight about the illumination conditions that can help in improving crackdetection in a challenging real-world industrial environment.

A Versatile Crack Inspection Portable System based on Classifier Ensemble and Controlled Illumination