Abstract:
An image scanner having an improved scanning quality is disclosed. Two different color blocks having an interface therebetween are provided on the document platform of the image scanner. The image pickup device passes by the color blocks prior to the document area so that color calibrations and/or error detection can be performed before the scanning operation is performed. By this way, the color data such as the brightness of the obtained image can be compensated, and the deflection rate and/or the amplification error of the image pickup device can be corrected.
Abstract:
A method for quick determination of a scan start point for an image scanner is disclosed. The image scanner includes a photo-processing device and a scanning platform for placing thereon a document to be scanned. The scanning platform is printed with a pattern mark which is located between a home position and a scan start point of the photo-processing device, and has a specified point being a predetermined first shift to the scan start point along a specific direction. According to the method, the photo-processing device moves a predetermined distance from the home position to a pre-scan position overlapping with the pattern mark, then moves a calculated distance from the pre-scan position to the specified point, and moves another predetermined distance from the specified point to the scan start point along the specific direction.
Abstract:
An image reading apparatus that optically reads a document includes: multiple line sensors provided approximately parallel to each other and each having light-receiving elements arranged in line form, each line sensor capturing respective line-shaped regions spanning in the main scanning direction of the document in respective color components; a movement unit that causes the positional relationship between the document and the multiple line sensors to move relative to the sub scanning direction that is orthogonal to the main scanning direction; a color skew adjustment unit that adjusts positional skew in the sub scanning direction in scan data of each of the color components captured by the multiple line sensors in synchronization with the movement caused by the movement unit, in accordance with an offset amount based on the distance between each of the multiple line sensors.
Abstract:
The calibration of an imaging system is adjusted for geometric distortion of an image formed by a group of imaging channels on a media supported on a media support. The media support includes a plurality of individually spaced reference features disposed on a surface of the media support and a change in an expected position of at least one of the reference features is determined. Activation timing of the channels is adjusted in accordance with such changes. The imaging channels can be supported on a movable carriage and movement of the carriage can be adjusted in accordance with such changes.
Abstract:
A method for determining a position of a mechanical edge of a reference edge of a sheet of recording media relative to a first edge of a drum slot in a cylindrical surface of an imaging drum, the method includes mounting the sheet of recording media on the imaging drum in an orientation wherein the reference edge extends along the cylindrical surface of the imaging drum in a substantially axial direction and wherein the reference edge extends over the first edge of the drum slot; establishing at least one acute apex diffuse light source in the slot; capturing at least one digital camera image of the reference edge and the at least one acute apex diffuse light source; and determining from the at least one digital camera image a location of at least one point on the mechanical edge.
Abstract:
A scanning device is provided with a first transparent plate on which an original sheet to is placed, the original sheet being scanned statically, a reading unit arranged below the first transparent plate and configured to scan an image on the original sheet in the main scanning direction, the reading unit being movable in an auxiliary scanning direction, and a first reference member defining a reference position for scanning an image on the original sheet, in the main scanning direction and in the auxiliary scanning direction. The first reference member is arranged at an unused area of the first transparent plate, the unused area being an area which is within the original sheet placeable area on the first transparent plate and is not covered with original sheets of a plurality of predetermined different sizes placed on the first transparent plate with being positioned with respect to a predetermined positioning point.
Abstract:
It is possible to set an optical magnification capable of making a recording position shift amount with respect to Y direction of the plotting point formed by a micro mirror within an allowance range from the relationship between a Y-direction distance between mirror images obtained by projecting micro mirrors constituting a DMD onto a substrate, an inclination angle of the DMD, an image pattern recording pitch, and an optical magnification.
Abstract:
In a method for initializing an image scanner having a scanning module and an automatic document feed (ADF) glass, the scanning module is moved in a forward direction toward the ADF glass to search for a reference mark located within a relatively close proximity to the ADF glass. The scanning module is moved forward to search for a black-white transition in response to the reference mark being located and the scanning module is moved in a backward direction away from the ADF glass in response to the black-white transition being located. The scanning module is stopped when the image sensor of the scanning module is aligned with an origin mark to thereby accurately position the scanning module.
Abstract:
An image reading apparatus includes a reading unit, a control unit, and a pattern region. The reading unit moves a linear reading range, which is provided in a main scanning direction, in a sub-scanning direction that intersects with the main scanning direction while reading an object that faces the reading range, and generates image data on the basis of a read result. The control unit controls the reading unit. The pattern region includes a predetermined pattern that defines a reference position for specifying a reading position that is read by the reading unit. The predetermined pattern has a characteristic portion that specifies a schematic position of the predetermined pattern in the sub-scanning direction. The control unit includes a first image acquisition unit, a pattern searching unit, a second image acquisition unit, a characteristic portion searching unit, a first reprocessing instruction unit, and a second reprocessing instruction unit.
Abstract:
A printer for printing on a medium on an endless belt by printer heads includes: a generator generating printing data for each printer head; a detector detecting time-series data for the meandering of the medium; a generator generating correction data preventing disorder of a printed image due to the meandering; and a controller operating each printer head according to the correction and printing data, wherein the correction-data generator selects a specific difference between factors in the time when the time-series and predetermined time-series data are related and newly generates correction data corresponding to the selected factor, a replacement section replaces a factor in the time corresponding to the specific factor of the reference time-series data with the specific factor, and the time-series-data detector has a stop stopping detection of the time-series data when the absolute change value of a physical value influencing meandering is a predetermined value or less.