the presently claimed invention relates to image sensors to be worn or attached on a human . one claim recites an apparatus including : an image sensor to capture image data , said apparatus to be worn or attached on a human so that said image sensor captures image data while said apparatus is worn or attached on the human ; and an analyzer to analyze captured image data and to determine plural - bit identifiers for one or more objects represented in the captured image data . of course , additional combinations are provided as claimed as well .