1. A system comprising: an image device including, an emitter to emit uniform infrared (IR) radiation that is to be converted to non-uniform IR radiation having an IR pattern, and a capturer to capture reflected non-uniform IR radiation, a pattern receiver to receive a feature IR pattern corresponding to non-uniform IR radiation reflected by skin of a user feature and an object IR pattern corresponding to non-uniform IR radiation reflected by an object, a filter to generate a modified IR pattern from the object IR pattern and to remove at least a part of the modified IR pattern from feature IR pattern, and a feature characterizer to characterize the user feature based on the feature IR pattern.