Patent ID: 7145160
Filing Date: 2006-12-05
Classification: G03G

Abstract:
1. A method of determining a class of a medium to form an image using an image forming apparatus which comprises a light emitting part that emits light and a light receiving part that senses the light, the method comprising: emitting the light to the medium; sensing the emitted light which is affected by the medium; collecting a first predetermined number of features which are represented by a relationship between a parameter of the medium and an intensity of the light sensed by the light receiving part; and determining the class of the medium using the collected features according to clusters of the features, wherein one of the light emitting part and the light receiving part moves independently of the other of the light emitting part and the light receiving part to emit or sense the light, and the parameter varies with the movement of the light emitting part or the light receiving part.