An image forming apparatus is provided. The transient calculation includes calculating a transient electric field of each polyhedral element, calculating a transient magnetic field of each polyhedral element, and updating the magnetic permeability in accordance with a magnetic flux density determined from the calculated transient magnetic field. A pressure sensitive device is coupled to the sensor housing and is configured define a reference chamber in at least a portion of the inner volume. The application accepts food and weight inputs and user activity units and develops a user intrinsic metabolism. The content abstractions are eliminated at the egress terminus. The detecting apparatus corrects a deviation of the angle of the imaging direction on the basis of a process of reducing pixels in the horizontal direction of an image and acceleration of the camera, thereby improving the precision of the detection.