Abstract: The present invention efficiently optimizes a non-ejection correction parameter for each nozzle. The non-ejection correction parameter for each nozzle is optimized by repeatedly executing the operations of generating test chart data based on a non-ejection correction parameter for each of a plurality of nozzles provided on an ink-jet head; acquiring read data of a test chart recorded on a recording medium by ejecting ink from the plurality of nozzles based on the test chart data while relatively moving the ink-jet head and the recording medium; evaluating a correction intensity of the non-ejection correction parameter for each of the nozzles based on the acquired read data; and updating the non-ejection correction parameter for each of the nozzles based on a single variable root-finding algorithm using iteration method from the evaluated correction intensity.

Abstract: The present invention efficiently optimizes a non-ejection correction parameter for each nozzle. The non-ejection correction parameter for each nozzle is optimized by repeatedly executing the operations of generating test chart data based on a non-ejection correction parameter for each of a plurality of nozzles provided on an ink-jet head; acquiring read data of a test chart recorded on a recording medium by ejecting ink from the plurality of nozzles based on the test chart data while relatively moving the ink-jet head and the recording medium; evaluating a correction intensity of the non-ejection correction parameter for each of the nozzles based on the acquired read data; and updating the non-ejection correction parameter for each of the nozzles based on a single variable root-finding algorithm using iteration method from the evaluated correction intensity.

Abstract: According to the image recording apparatus and method of the present invention, as a defective recording element is detected immediately before a correction value is generated, while a correction value is being generated, and before an image is recorded, management of the recording elements can be ensured than before. In particular, as the detection of a defective recording element is carried out immediately before a correction value is generated, a defective recording element becomes known at the time of generating the correction value, and the correction value can be generated in a state where the defective recording element is put in a non-ejecting state. Further, a defective recording element can be detected more reliably. Through this, generation of a non-uniform streak resulting from a defective recording element can be suppressed with a higher possibility than before. As a result, an image of higher quality than before can be formed.

Abstract: A defective recording element correction parameter selection chart which is output by an image forming apparatus that performs image formation on a recording medium by a plurality of recording elements included in a recording head while conveying at least one of the recording head and the recording medium so as to cause relative movement between the recording head and the recording medium, the chart being used, in a case where there is at least one defective recording element which is not able to perform recording among the plurality of recording elements, in order to determine a defective recording element correction parameter expressing an amount of correction for correcting image formation defects caused by the at least one defective recording element, with image formation by a recording element other than the at least one defective recording element.

Abstract: An image processing method of creating image data for forming an image on a recording medium by ejecting liquid droplets from a plurality of nozzles of a recording head onto the recording medium while causing relative movement of the recording medium and the recording head, includes: a correction coefficient storage step of determining correction coefficients for ejection failure correction based on difference of landing interference patterns of a plurality of types, and storing the correction coefficients for ejection failure correction according to the landing interference patterns, in a storage unit; an ejection failure nozzle position information acquisition step of acquiring ejection failure nozzle position information and a correction processing step of performing a correction calculation on input image data using a corresponding correction coefficient obtained by referring to the correction coefficients for ejection failure correction according to the ejection failure nozzle position information.

Abstract: A defective recording element correction parameter selection chart which is output by an image forming apparatus that performs image formation on a recording medium by a plurality of recording elements included in a recording head while conveying at least one of the recording head and the recording medium so as to cause relative movement between the recording head and the recording medium, the chart being used, in a case where there is at least one defective recording element which is not able to perform recording among the plurality of recording elements, in order to determine a defective recording element correction parameter expressing an amount of correction for correcting image formation defects caused by the at least one defective recording element, with image formation by a recording element other than the at least one defective recording element, the chart includes: a reference patch constituted by a uniform image which is an image formed on a region of the recording medium with a uniform density base

Abstract: An image processing method of creating image data for forming an image on a recording medium by ejecting liquid droplets from a plurality of nozzles of a recording head onto the recording medium while causing relative movement of the recording medium and the recording head, includes: a correction coefficient storage step of determining correction coefficients for ejection failure correction based on difference of landing interference patterns of a plurality of types, according to correspondence information indicating correspondence relationship between the landing interference patterns and the respective nozzles, the landing interference patterns being based on a landing interference inducing factor including a deposition sequence of the liquid droplets on the recording medium that is defined by an arrangement configuration of the plurality of nozzles and a direction of the relative movement, and storing the correction coefficients for ejection failure correction according to the landing interference patterns

Abstract: A provided optical-phase-distribution measuring method, by which optical phase distribution is identified at high speed and with high accuracy from information on light-intensity distribution without using a special measuring device, comprises steps: for inputting light to be measured to optical systems, respectively, modulating the intensity and the phase, detecting the output light to be measured with CCD, and measuring the intensity distribution of detected light to be measured as an image with an optical-phase-distribution measuring system provided with the two different optical systems; for setting an observation equation, based on the intensity distribution and on the optical characteristics of the optical systems; for setting a phase-distribution identification inverse-problem from the observation equation, and formulating the set phase-distribution identification inverse-problem as a first nonlinear optimization problem in which complex amplitude representing the light to be measured is assumed to be

Abstract: A provided optical-phase-distribution measuring method, by which optical phase distribution is identified at high speed and with high accuracy from information on light-intensity distribution without using a special measuring device, comprises steps: for inputting light to be measured to optical systems, respectively, modulating the intensity and the phase, detecting the output light to be measured with CCD, and measuring the intensity distribution of detected light to be measured as an image with an optical-phase-distribution measuring system provided with the two different optical systems; for setting an observation equation, based on the intensity distribution and on the optical characteristics of the optical systems; for setting a phase-distribution identification inverse-problem from the observation equation, and formulating the set phase-distribution identification inverse-problem as a first nonlinear optimization problem in which complex amplitude representing the light to be measured is assumed to be