Patent ID: 7907853

Claim:
An image forming apparatus, comprising: a condition determining device configured to calculate a deviation amount of image data from a normal condition and configured to determine if the image forming apparatus is in an abnormal condition; an abnormal section specifying device configured to specify an abnormal section in the image forming apparatus based on a condition of the image forming apparatus; an image processing device configured to execute image processing for abnormal use in accordance with an output of the abnormal section specifying device when the image data condition determining device determines that the image forming apparatus is in an abnormal condition; and a service person call output device configured to output a service person call signal indicative of calling a service person to a center when the image data condition determining device determines that the image forming apparatus is in an abnormal condition, wherein said condition determining device determines a deviation amount from the normal condition based on granularity of an image, wherein said image processing device determines if an abnormality is present in an exposure system when the condition determining device determines that the image forming apparatus is in the abnormal condition, and wherein said image processing device executes halftone processing for abnormal use based on the result of the abnormality presence determination, wherein said halftone processing for abnormal use at least includes one of switching processing for decreasing a frequency of an image to be formed and switching processing for changing a screen angle.