An identification apparatus includes a guide member defining a guide path, a scanning portion that scans the sheet inserted in the guide path, a first detection portion disposed upstream of the scanning portion in an insertion direction of the sheet in the guide path that detects presence/absence of the sheet, and a second detection portion disposed downstream of the scanning portion in the insertion direction in the guide path and detects presence/absence of the sheet. The identification apparatus is configured to start measurement of a surface property of the sheet by the scanning portion in response to a change in a detection result of one of the first detection portion or the second detection portion, and complete the measurement in response to a change in a detection result whichever of the first detection portion or the second detection portion not used in determining the start of the measurement.

Examples of printing device calibration based on a lot code are described. In an example, a lot code of a print media is determined. Calibration parameters for a printing device are determined based on the lot code. The printing device is calibrated to print on the print media based on the calibration parameters.

A multi-mode scanning device for scanning an original includes a non-transparent element, a first light source, a second light source and an optical module. The first light source outputs visible light to irradiate the non-transparent element and the original to generate first light and second light, respectively. The second light source outputs invisible light to irradiate a combination of the non-transparent element and the original to generate third light and fourth light. The optical module receives the first light, the second light, the third light and the fourth light and generates sensing signals representative of visible light information and invisible light information of the original. The original is disposed between the non-transparent element and the optical module. The first light source and the optical module are disposed on a same side of the non-transparent element.

In an image reading apparatus, a controller detects a plurality of detection points along a first edge, sets one of the detection points arranged along the first edge which is closest to a center of a sheet placement area in a second axial direction, and determines a reference read position in the second axial direction, based on the selected detection point. Furthermore, the controller detects a plurality of detection points along a second edge, sets one of the detection points arranged along the second edge which is closest to a center of the sheet placement area in a first axial direction, and determines a reference read position in the first axial direction, based on the selected detection point.

An image reading apparatus, having a reader device, a user interface, a communication interface, and a controller, is provided. The controller accepts entry of first receiver-identifying information, in response to entry of a first scan command through the user interface, controls the reader device to read an image of an original material, and stores image data for the read image in relation with the first receiver-identifying information in a predetermined memory area. In response to receiving of a second scan command including second receiver-identifying information that corresponds to the first receiver-identifying information by identifying the same receiver from an information processing apparatus by use of a specific protocol, the controller reads out the image data stored in relation with the first receiver-identifying information corresponding to the second receiver-identifying information included in the second scan command from the predetermined memory area, and transmits the image data to the information processing apparatus.

A position detection device includes a background member, a reader, and processing circuitry. The background member has a higher absorption characteristic in an invisible wavelength region than in a visible wavelength region. The reader opposite the background member irradiates a recording medium having a mark and the background member with light of a visible wavelength to output a visible image or with light of an invisible wavelength to output an invisible image. The processing circuitry is configured to: detect an end position of the recording medium and a position of the mark on the recording medium from a read image output from the reader; and select the visible or invisible image as the read image used for position detection, according to an absorption characteristic of a color material forming the mark read by the reader and an absorption characteristic of the recording medium in the invisible wavelength region.

A placement detection system includes: a placement table; an imaging device that images an object placed on the placement table to generate an input image; and a control device. The control device generates a first binarized image for the input image based on a first threshold value and determines whether the object is placed in a predetermined placement orientation. The control device changes a threshold value for a target pixel to a second threshold value higher than the first threshold value when the object is determined to be placed in the predetermined placement orientation, the target pixel being sandwiched between pixels having pixel levels lower than or equal to the first threshold value and has a higher pixel level than the first threshold value in a first region, generates a second binarized image for the target pixel based on the second threshold value, and detects a shape of the object.

An image reading apparatus including: a conveyor that conveys a sheet on which an image is formed by an image forming apparatus; a reader that reads the sheet conveyed by the conveyor, by using a contact image sensor; and a first hardware processor that extracts an edge of the sheet by analyzing a read image by the reader, calculates a blur amount of the edge based on the extracted edge, and calculates a curl amount of the sheet based on the calculated blur amount.

In one example, a device to transfer multiple first positions of an edge guide movable back and forth across a print media input tray to corresponding multiple second positions of an optical marker movable back and forth along a scan line next to a scan bed located near the input tray. The device includes a first part connected to or integral with the edge guide, a second part connected to or integral with the marker, and a mechanical link linking the first part and the second part to convert linear motion of the edge guide back and forth across the tray to linear motion of the marker back and forth along the scan line.

A document placement detecting device includes a document table, a plate, a plurality of invisible light sources, an imaging device, and circuitry. The document table transmits light. The plate is openable and closable relative to the document table, and covers the document table in a closed state of the plate. The plurality of invisible light sources irradiate a placement area with invisible light via the document table. The placement area is an area of the document table on which a document is placed. The imaging device receives reflected light from the document, and outputs read data. The circuitry detects the placement of the document with a change in a read value of the read data output from the imaging device based on the irradiation with the invisible light.