Transfer learning using convolutional neural networks for object classification within X ray baggage security imagery
We consider the use of transfer learning, via the use of deep Convolutional Neural Networks (CNN) for the image classification problem posed within the context of X ray baggage security screening. The use of a deep multi layer CNN approach, traditionally requires large amounts of training data, in order to facilitate construction of a complex complete end to end feature extraction, representation and classification process. Within the context of X ray security screening, limited availability of training for particular items of interest can thus pose a problem. To overcome this issue, we employ a transfer learning paradigm such that a pre trained CNN, primarily trained for generalized image classification tasks where sufficient training data exists, can be specifically optimized as a later secondary process that targets specific this application domain. For the classical handgun detection problem we achieve 98.92% detection accuracy outperforming prior work in the field and furthermore extend our evaluation to a multiple object classification task within this context.
2016 IEEE International Conference on Image Processing (ICIP)