IMAGE FORMING APPARATUS

摘要

An image forming apparatus including: a first processing unit configured to subject input image data to tone correction with use of a tone correction table; a second processing unit configured to subject the image data to dither processing; a correction unit configured to correct the image data with use of a correction amount based on positional deviation of scanning lines caused by a mirror face tangle error; a deflection unit configured to deflect light beams emitted from the light source with a mirror face to form the scanning lines; an extraction unit configured to extract a feature amount of the tone correction table; and an adjustment unit configured to adjust a change in tone characteristics in a case where the feature amount extracted by the extraction unit exceeds a predetermined range.

主权项

1. An image forming apparatus, comprising:
a first processing unit configured to subject input image data to tone correction with use of a tone correction table; a second processing unit configured to subject the image data subjected to the tone correction by the first processing unit to dither processing; a correction unit configured to correct the image data subjected to the dither processing by the second processing unit with use of a correction amount based on positional deviation of scanning lines in a first direction caused by a mirror face tangle error of a deflection unit; a light source comprising a plurality of light emitting points and configured to emit light beams based on the image data corrected by the correction unit; a photosensitive member configured to rotate in the first direction so that a latent image is formed on the photosensitive member by the light beams emitted from the light source; the deflection unit configured to deflect the light beams emitted from the light source with the mirror face and cause light spots of the light beams radiated on the photosensitive member to be moved in a second direction orthogonal to the first direction to form the scanning lines; a developing unit configured to develop the latent image formed on the photosensitive member; an extraction unit configured to extract a feature amount of the tone correction table to determine that tone characteristics have been changed; and an adjustment unit configured to adjust a change in the tone characteristics by determining that the tone characteristics have been changed in a case where the feature amount extracted by the extraction unit exceeds a predetermined range.