An image edge enhancing method adjusts a luminance of a target pixel of a digital image. The hub includes two diametrically disposed protrusions, and the spindle includes two openings. The social networking system may provide questions to the target user and recommend a group to the target user based on received answers to the questions. In interlace scanning, based on the end of a blackout state of a scanning line in a field, selection of a scanning line in the next field for writing is started. The handheld computing device may be used to obtain information on products being sold in a store. The main conductor, the forward coupled conductor and the reverse coupled conductor are arranged in parallel within the housing such that the main conductor and the forward coupled conductor define a first two section quarter wave directional coupler, and the main conductor and the reverse coupled conductor define a second two section quarter wave directional coupler.