Researchers at State Key Laboratory of Computer Science and Beihang University in China and JD Finance America Corporation in the United States have released the largest dataset of x-ray images of items commonly prohibited at security checkpoints. The dataset contains 47,677 x-rays of 12 categories of objects: guns, knives, wrenches, pliers, scissors, hammers, handcuffs, batons, sprayers, power banks, lighters, and bullets.
Image credit: Flickr user Thomas Hawk