An image forming apparatus includes a first reading unit configured to read a first image on a first surface of a document, a second reading unit configured to read a second image on a second surface of the document different from the first surface, a printing unit configured to print a third image on a sheet, and a setting unit configured to set resolution of the third image printed by the printing unit. The printing unit prints the third image on the sheet with the resolution set by the setting unit. The printing unit also prints a fourth image with resolution lower than or equal to a threshold, without using the set resolution, the fourth image used for correction of at least a color value obtained by reading the second image using the second reading unit.

An example image forming apparatus includes a printing unit including a fixing device to form an image on a print medium, a housing in which the printing unit is located, and a scanner, to read image information from a document, located above the printing unit in a vertical projected area of the housing with respect to a discharge direction of the print medium discharged from the printing unit so as not to overlap with a heater of the fixing device.

An image forming apparatus includes a first reading unit configured to read a first image on a first surface of a document, a second reading unit configured to read a second image on a second surface of the document different from the first surface, a printing unit configured to print a third image on a sheet, and a setting unit configured to set resolution of the third image printed by the printing unit. The printing unit prints the third image on the sheet with the resolution set by the setting unit. The printing unit also prints a fourth image with resolution lower than or equal to a threshold, without using the set resolution, the fourth image used for correction of at least a color value obtained by reading the second image using the second reading unit.

First, shading charts are printed on a surface of a recording medium. Then, a plurality of captured images is acquired for a region of the same density of the shading charts printed on the recording medium. At this time, the amounts of displacement in the position of the recording medium in the main scanning direction, which is the direction of arrangement of nozzles, are also detected. Then, one super-resolution image with a higher resolution than the captured images is generated on the basis of the captured images and the amounts of displacement in the position of the recording medium in the main scanning direction. Thereafter, a variable-density correction amount is calculated for each of the nozzles on the basis of the generated super-resolution image.

First, shading charts are printed on a surface of a recording medium. Then, a plurality of captured images is acquired for a region of the same density of the shading charts printed on the recording medium. At this time, the amounts of displacement in the position of the recording medium in the main scanning direction, which is the direction of arrangement of nozzles, are also detected. Then, one super-resolution image with a higher resolution than the captured images is generated on the basis of the captured images and the amounts of displacement in the position of the recording medium in the main scanning direction. Thereafter, a variable-density correction amount is calculated for each of the nozzles on the basis of the generated super-resolution image.

The following relates generally to error detection in voting systems, and, in particular voting systems using optical scan machines. In some embodiments, one or more processors are configured to: (1) capture, with an optical scan machine, original image data; (2) isolate a first subimage of the original image data; (3) associate the first subimage with a first configuration file candidate, wherein the first configuration file candidate is indicated by a configuration file configuring the optical scan machine, and wherein the association is done according to the configuration file; and (4) display the first subimage along with a representation of the first configuration file candidate.

The following relates generally to error detection in voting systems, and, in particular voting systems using optical scan machines. In some embodiments, one or more processors are configured to: (1) capture, with an optical scan machine, original image data; (2) isolate a first subimage of the original image data; (3) associate the first subimage with a first configuration file candidate, wherein the first configuration file candidate is indicated by a configuration file configuring the optical scan machine, and wherein the association is done according to the configuration file; and (4) display the first subimage along with a representation of the first configuration file candidate.