An implementation of a technology, described herein, for relevance-feedback, content-based facilitating accurate and efficient image retrieval minimizes the number of iterations for user feedback regarding the semantic relevance of exemplary images while maximizing the resulting relevance of each iteration. The metal layer is substantially oxide free. The second rotary output portion is rotatable independently of the rotary input portion. The image scanner obtains an image of the documents, obtains an image of a selected area of the documents, and obtains information contained in the selected area of the document.