Abstract: In an example implementation, a method of iterative calibration includes, in a first iteration, measuring first values of a calibration parameter, and determining first corrections for the measured first values. The method includes, in a next iteration, measuring next values of the calibration parameter that incorporate the first corrections. The first corrections are omitted from the next iteration measurements to provide pseudo iteration measurements, and the first iteration measurements are averaged with the pseudo iteration measurements. Second corrections are then determined based on the averaging.

Abstract: In an example implementation, a method of iterative calibration includes, in a first iteration, measuring first values of a calibration parameter, and determining first corrections for the measured first values. The method includes, in a next iteration, measuring next values of the calibration parameter that incorporate the first corrections. The first corrections are omitted from the next iteration measurements to provide pseudo iteration measurements, and the first iteration measurements are averaged with the pseudo iteration measurements. Second corrections are then determined based on the averaging.

Abstract: A method and system for monitoring an image capturing device determines a distortion of an image of a printing medium, wherein the image is captured by means of an image capturing device, such as an in-line camera or scanner, and wherein the image comprises a calibration pattern with a plurality of calibration marks printed on the printing medium. The calibration pattern comprises at least a first sub-set of calibration marks relating to a first separation and a second sub-set of calibration marks relating to a second separation. The distortion is determined by analyzing the first sub-set of calibration marks, and the image is corrected based on said determined distortion. The displacement of the second sub-set of calibration marks with respect to the first sub-set of calibration marks may then be determined. The invention may be employed in a wide range of printers and presses.