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Image of the food setting with the fiducial marker (FM). The participant captures the entire food setting at one step away from the edge of the table. The height of the mobile phone camera above the setting (~1 foot) is first determined using the ribbon on the FM. When stepping back, elbows are clipped to one's sides to maintain position of the arms. Keeping the arms steady, the mobile phone camera is tilted up or down until the whole setting can be seen on the screen.
