A method of printing improved printed products using defect-free printing machine nozzles and compensated defective nozzles includes printing products and a test chart with test fields onto a transported substrate, the test fields having tonal values, every test field including an unprinted line from a nonactivated, nonprinting nozzle compensated by a neighboring nozzle having a compensation value, pairs of tonal value and compensation value being specified and used for the chart, recording an image of the chart, computer-analyzing the image and determining the compensation value. Every pair of tonal value and compensation value is used multiple times in the chart and a corresponding number of spaced apart test fields is created. A characteristic value representing test field homogeneity and determining compensation value quality is assigned to every measuring field. The best characteristic value regarding a specified criterion and the compensation value is determined for every tonal value.

An image processing apparatus obtains a plurality of measured values obtained by measuring a measurement image; and replaces a first measured value with a value based on a second measured value. The first measured value being included in the plurality of measured values and being unsuitable for identifying the density characteristic, and the second measured value being included in the plurality of measured values and being suitable for identifying the density characteristic.

There is provided a printer including: a head including head chips; a conveyor; and a controller. The head chips are arranged in an intersecting direction that intersects with a conveyance direction, and two head chips adjacent to each other in the intersecting direction are shifted from each other in the conveyance direction. The controller is configured to execute: print a bar code having a first portion and a second portion; determine based on the printing data whether a seam between the two head chips is positioned in the first portion; and adjust a printing position of the bar code with respect to the head so that the seam is positioned in the second portion.

It is intended to allow whether or not a noise included in a read image is a noise due to an ink ejection failure to be more reliably determined. An image reading device includes an image reading unit that reads an image formation surface of paper by using a reducing optical system and a control unit. The image reading unit includes a plurality of read sensors disposed at positions displaced from each other in a main scanning direction. The plurality of read sensors are disposed to be able to read the image formation surface by using at least a local region of the image formation surface as a common region to be read. The control unit determines, based on a first image obtained by a first read sensor included in the plurality of read sensors and on a second image obtained by a second read sensor included in the plurality of read sensors, an amount of displacement of a noise resulting from a parallax between the first read sensor and the second read sensor and determines, based on the amount of displacement, whether or not the noise is present on the image formation surface.

A method of controlling a system including an arrangement of at least two nozzles, wherein the arrangement and the shape move relative to each other, each nozzle traces a respective path on the shape, and each nozzle is configured to jet drops at actual jetting locations along the respective path of the nozzle. The method results in sequence of actuation events received from a control signal to be more frequent than would be needed for an arrangement printing on a flat surface to produce the required dot resolution. It is then possible to select which of the individual nozzles are to jet for a given actuation event from the sequence so that the actual jetting locations deviate from the target jetting locations by no ore than a define maximum error distance.

A method of controlling a system including a printhead for printing an image on at least one surface, wherein the at least one surface differs in shape from a nominal surface by a known tolerance, and wherein the printhead and the at least one surface move relative to each other along a predetermined print path comprising at least one swathe. Small dot patterns (referred to as “pathfinders”) are printed on a surface of the object in a preliminary printing pass, then the printed dot patterns are analyzed, for example with a machine vision system. The necessary corrections may then be calculated from this analysis and applied to a subsequent full printing pass.

A printing system is disclosed. The printing system includes at least one physical memory device to store halftone calibration logic and one or more processors coupled with the at least one physical memory device to execute the halftone calibration logic to receive print image measurement data corresponding to a first halftone design associated with each of a plurality of pel forming elements, generate measurement data for each of the pel forming elements based on the print image measurement data, generate a uniformity compensated halftone for each of the pel forming elements based on inverse transfer functions corresponding to each of the pel forming elements and the first halftone design and transmit the uniformity compensated halftone for each of the pel forming elements.

A driving device is provided. The driving device includes a plurality of load blocks each including a load element, a plurality of driving circuits configured to drive the plurality of load blocks, and a connection circuit configured to connect the plurality of load blocks to the plurality of driving circuits, respectively. The connection circuit is configured to switch a connection combination of each of the plurality of load blocks and each of the plurality of driving circuits.

A method of controlling a system including an arrangement of at least two nozzles, wherein the arrangement and the shape move relative to each other, each nozzle traces a respective path on the shape, and each nozzle is configured to jet drops at actual jetting locations along the respective path of the nozzle. The method results in sequence of actuation events received from a control signal to be more frequent than would be needed for an arrangement printing on a flat surface to produce the required dot resolution. It is then possible to select which of the individual nozzles are to jet for a given actuation event from the sequence so that the actual jetting locations deviate from the target jetting locations by no ore than a define maximum error distance.

An image processing method, an apparatus, a program, and an image forming apparatus capable of suppressing an artifact in a boundary part of a threshold value matrix and performing high-quality correction even in a case where defective recording elements are concentrated are provided. An image processing method according to an aspect of the present invention includes performing correction of suppressing visibility of an image defect using recording elements around a defective recording element of a recording head by disabling the defective recording element, and performing quantization of data of an image, in which processing of the quantization includes applying a first threshold value matrix to a first image region that is separated by more than a first distance from a defective image region, applying a second threshold value matrix to a second image region separated by less than the first distance, and applying a third threshold value matrix to a third image region at a boundary between the first image region and the second image region.