This disclosure relates generally to image processing, and more particularly to system and method for detecting and annotating bold text in an image document. In one embodiment, a method is provided for annotating bold text in an image document. The method comprises receiving the image document, processing the image document to derive a digitized textual image, detecting one or more regions of bold text within the digitized textual image using an adaptive edge rounding filter, and annotating the one or more regions of bold text within the image document.