“…Although Global Image representation via the Bag of Visual Word (BOVW) has been popular over the last two decades [28,29,30,31,32,33,34,35], and has been recognised to be most appropriate for Unsupervised Image categorisation process [20,36,37], the need to quantise a large number of image features into Visual Words using the K-Means algorithm during the BOVW codebook development creates a heavy a number of computational problems [21,24,25,38,39], and often yields Visual Words that do not guarantee optimum classification performance. Therefore, towards reducing the number of image features to be handled during BOVW Codebook Development and to allow, this section reviews some previous works related to the application of Deep Feature Learning to Image Representation and Vector quantisation in BOVW Image modelling.…”