Image forming apparatus for scanning light beam at non-uniform scan speed and exposing photosensitive member

An image forming apparatus comprising:

• a photosensitive member;
• an irradiation unit configured to form an electrostatic latent image on the photosensitive member by scanning a laser beam at a non-uniform scan speed with respect to a main scanning direction and exposing the photosensitive member;
• a correction unit configured to generate second image data by performing correction processing for correcting a tone value of a pixel in first image data in accordance with a position in the main scanning direction;
• and
• a decision unit configured to decide, based on the second image data, a development region of an image formed by using each submatrix of a dither matrix including a plurality of submatrices,
• wherein in at least one of a first dither matrix corresponding to a first section, and a second dither matrix corresponding to the second section adjacent to the first dither matrix in the main scanning direction and corresponding to the second section different from the first section in tone value, at least a size of a development region of an image formed by using a first submatrix corresponding to a predetermined tone value in the dither matrix and a size of a development region of an image formed by using a second submatrix corresponding to the predetermined tone value are different.

An image forming apparatus comprising:

• a photosensitive member;
• an irradiation unit configured to form an electrostatic latent image on the photosensitive member by scanning a laser beam at a non-uniform scan speed with respect to a main scanning direction and exposing the photosensitive member;
• and
• a correction unit configured to correct a tone value of a pixel in image data in accordance with a position in the main scanning direction,
• wherein in a plurality of regions in at least one of a first section, and a second section adjacent to the first section in the main scanning direction and different from the first section in tone value, at least a size of an exposure region in a first region corresponding to a predetermined tone value and a size of an exposure region in a second region corresponding to the predetermined tone value are different.

An image forming apparatus comprising:

• a photosensitive member;
• an irradiation unit configured to form an electrostatic latent image on the photosensitive member by scanning a laser beam at a non-uniform scan speed with respect to a main scanning direction and exposing the photosensitive member;
• and
• a correction unit configured to correct a tone value of a pixel in image data in accordance with a position in the main scanning direction,
• wherein in a plurality of regions in at least one of a first section, and a second section adjacent to the first section in the main scanning direction and different from the first section in tone value, at least a size of a development region in a first region corresponding to a predetermined tone value and a size of a development region in a second region corresponding to the predetermined tone value are different.