Patent ID: 9122217
Filing Date: 2015-09-01
Classification: G03G,H04N

Abstract:
1. An image forming apparatus comprising: an image forming section configured to make and feed printed sheets sequentially; a sensor section which the printed sheets fed from the image forming section pass through or by in a first direction one by one, configured to irradiate each of the passing printed sheets with light elongated in a second direction different from the first direction, thereby sensing densities of the each of passing printed sheets, on a pixel basis; and a control section configured to integrate densities of respectively corresponding line portions in respective non-image areas of M sheets of the printed sheets, where M is a natural number equal to or more than two, based on the densities obtained by the sensor section, each of the line portion extending substantially in the first direction and including pixels on substantially a same position in the second direction, thereby obtaining integrated density values, and to predict, based on the obtained integrated density values, that a noise will occur on a printed sheet to be made by the image forming section later on.