According to one embodiment, an image processing apparatus includes an input unit and a control unit. The input unit accepts a reference point of scaling for enlarging or reducing image data. The control unit performs inversion for inverting the image data according to the reference point in either or both of a main scanning direction and a sub scanning direction. The control unit performs scaling on the inverted image data generated by performing the inversion to generate scaled image data. The control unit performs inversion on the scaled image data again to generate non-inverted scaled image data.

According to one embodiment, an image processing apparatus includes an input unit and a control unit. The input unit accepts a reference point of scaling for enlarging or reducing image data. The control unit performs inversion for inverting the image data according to the reference point in either or both of a main scanning direction and a sub scanning direction. The control unit performs scaling on the inverted image data generated by performing the inversion to generate scaled image data. The control unit performs inversion on the scaled image data again to generate non-inverted scaled image data.

An image forming apparatus includes a photosensitive member; a charging device, a developing device, a transfer device, and a controller. The controller is capable of executing an operation in a first mode in which an image forming operation is controlled so that an exposure start enable timing is set during movement of the photosensitive member through one full circumference from first passing, through an exposure position, of a region of the photosensitive member which has passed through a charging position, and executing an operation in a second mode in which an image forming operation is controlled so that the exposure start enable timing is set after the movement of the photosensitive member. On the basis of image information of the first sheet of an image forming job, the controller selects an executing mode from a plurality of modes including at least the first mode and the second mode.

An image forming apparatus includes a photosensitive member; a charging device, a developing device, a transfer device, and a controller. The controller is capable of executing an operation in a first mode in which an image forming operation is controlled so that an exposure start enable timing is set during movement of the photosensitive member through one full circumference from first passing, through an exposure position, of a region of the photosensitive member which has passed through a charging position, and executing an operation in a second mode in which an image forming operation is controlled so that the exposure start enable timing is set after the movement of the photosensitive member. On the basis of image information of the first sheet of an image forming job, the controller selects an executing mode from a plurality of modes including at least the first mode and the second mode.

An image reading apparatus including an upper unit provided so as to be openable and closeable with respect to a lower unit, wherein the lower unit includes a two dimensional sensor that is disposed so as to face a medium fed from a medium support portion that supports the medium and detects movement of the medium in a two dimensional coordinate system, and a cover that switches a state in conjunction with opening and closing of the upper unit, exposes the two dimensional sensor in a state in which the upper unit is closed, and covers the two dimensional sensor in a state in which the upper unit is opened.

An image reading apparatus including an upper unit provided so as to be openable and closeable with respect to a lower unit, wherein the lower unit includes a two dimensional sensor that is disposed so as to face a medium fed from a medium support portion that supports the medium and detects movement of the medium in a two dimensional coordinate system, and a cover that switches a state in conjunction with opening and closing of the upper unit, exposes the two dimensional sensor in a state in which the upper unit is closed, and covers the two dimensional sensor in a state in which the upper unit is opened.

An image forming apparatus including: a drive motor configured to rotate a rotary polygon mirror to deflect light beam; a signal generation unit configured to generate a rotation synchronous signal; and a rotation control unit configured to control a rotation speed of the rotary polygon mirror, wherein the rotation control unit executes a masking processing of masking control of the drive motor based on the rotation synchronous signal, wherein a time period of a first masking processing for a first rotation speed is shorter than a time period of a second masking processing for the second rotation speed, and wherein when the rotation speed of the rotary polygon mirror is changed from the first rotation speed to the second rotation speed, the rotation control unit switches the masking processing from the first masking processing to the second masking processing after reduction of the rotation speed of the rotary polygon mirror is started.

An image forming apparatus including: a drive motor configured to rotate a rotary polygon mirror to deflect light beam; a signal generation unit configured to generate a rotation synchronous signal; and a rotation control unit configured to control a rotation speed of the rotary polygon mirror, wherein the rotation control unit executes a masking processing of masking control of the drive motor based on the rotation synchronous signal, wherein a time period of a first masking processing for a first rotation speed is shorter than a time period of a second masking processing for the second rotation speed, and wherein when the rotation speed of the rotary polygon mirror is changed from the first rotation speed to the second rotation speed, the rotation control unit switches the masking processing from the first masking processing to the second masking processing after reduction of the rotation speed of the rotary polygon mirror is started.

An image forming apparatus includes: a scanning unit configured to form an electrostatic latent image on a photoconductor by scanning the photoconductor with one or more scanning beams in a main scanning direction based on an image signal, repetitively in a sub-scanning direction perpendicular to the main scanning direction; a generating unit configured to perform halftone processing on image data to generate the image signal; and a storage unit configured to store correction information. The correction information is set such that start positions of a plurality of scanning lines are linearly displaced to either a negative side or a positive side of the main scanning direction along the sub-scanning direction, in accordance with a direction of a first vector forming a smaller angle with the sub-scanning direction among two vectors in the halftone processing.

An image forming apparatus includes an image reading device; an image forming device including a photoconductor, a charger, an exposure device including a light-emitting element, a memory to store a first correction value for correction a light emission amount of the light-emitting element, and a driver to drive the light-emitting element, a developing device, a transfer device, and a fixing device. The image forming apparatus further includes a processor to calculate a second correction value for correcting the light emission amount, based on density data of image data of a predetermined pattern on a recording medium; calculate a third correction value for correcting the light emission amount, based on the first correction value and the second correction value; and determine, before calculating the third correction value, whether placement of the recording medium on the reading table is correct based on the density data.