There is provided an information processing apparatus. The information processing apparatus acquires image data of a document read via a scanner; detects a streak included in the image data acquired by the acquisition unit by using a parameter for detection processing of detecting a streak; transmits the image data, the parameter, and a detection result obtained by the detection unit to an external apparatus; and changes the parameter used by the detection unit upon reception of a change in the parameter from the external apparatus.

An image reading device includes a first scanner, a second scanner, and circuitry. The first scanner is configured to read a first side of a recording medium. The second scanner is configured to read a second side of the recording medium. The circuitry is configured to generate a first correction value to correct misalignment between the first side and the second side. The circuitry is configured to input a second correction value. The circuitry is configured to correct an image based on the first correction value and the second correction value.

A correction value setting method includes a recording step of recording on a recording medium a test pattern including a plurality of patches by a plurality of nozzles arrayed in a first direction, a reading step of reading a concentration value of the test pattern recorded on the recording medium, a calculating step of calculating a correction value of an ink amount for each of the plurality of nozzles, based on the concentration value, and a setting step of setting the correction value as a correction value that is used for real recording. The plurality of patches include a plurality of first patches in a first concentration range and a plurality of second patches in a second concentration range including concentration higher than that in the first concentration range, and the plurality of first patches and the plurality of second patches are arranged alternately in a second direction intersecting the first direction.

A multi-mode document scanning system includes a scanning bed configured to transport a plurality of documents through a scanning area. A scanning camera is configured to image the documents. At least one illumination bank includes a plurality of illumination elements of at least two different light wavelengths interspersed on at least one illumination bank. An illumination source switching assembly controls at last some elements of one wavelength. A selection process selects a wavelength appropriate to a document to be scanned, and instructs a processor operatively coupled to the illumination source switching assembly to illuminate elements of that wavelength. A multi-mode scanning method of document scanning is also described.

An image reading apparatus includes an original stacking portion, an original feeding portion, an image reading portion, a shading operation portion, and a receiving portion. The shading operation portion acquires a shading correction value by causing the image reading portion to read a white reference member with a predetermined reading resolution when an original is stacked on the original stacking portion. When a resolution change instruction is received before reading of the original is started, depending on the resolution change instruction, the shading operation portion acquires a shading correction value by causing again the image reading portion to read the white reference member with a changed reading resolution.

A reading device including a position reference member having a reference pattern having a line extending along a first direction of the position reference member, the position reference member movable in a second direction orthogonal to the first direction; a reader including a plurality of sensor chips arranged along the first direction, each of the sensor chips having a length defined by a plurality of pixels; and circuitry. The circuitry is configured to detect the reference pattern of the position reference member using the reader; determine coordinates of at least two sensor chips in the second direction, based on the detected reference pattern of the position reference member; and correct a position of a reading target in the second direction based on the coordinates determined for the at least two sensor chips of the reader in the second direction.

A reading apparatus includes a conveyance roller configured to convey a medium, a reading unit configured to read an image of the medium conveyed by the conveyance roller, a detection unit configured to detect a rotation phase of the conveyance roller, a storage unit configured to store index values, each index value being associated with the rotation phase of the conveyance roller and corresponding to a conveyance amount of the conveyance roller per unit rotation angle, and a timing control circuit configured to select the index value based on a detection result of the detection unit and to control a reading timing of the reading unit based on a result of comparing a cumulative value of selected index values with a threshold corresponding to a reading resolution.

A correction value setting method includes a recording step of recording on a recording medium a test pattern including a plurality of patches by a plurality of nozzles arrayed in a first direction, a reading step of reading a concentration value of the test pattern recorded on the recording medium, a calculating step of calculating a correction value of an ink amount for each of the plurality of nozzles, based on the concentration value, and a setting step of setting the correction value as a correction value that is used for real recording. The plurality of patches include a plurality of first patches in a first concentration range and a plurality of second patches in a second concentration range including concentration higher than that in the first concentration range, and the plurality of first patches and the plurality of second patches are arranged alternately in a second direction intersecting the first direction.

In a reading device, a light transmissive member has a front surface on which an original is placed. A peripheral member is adjacent to the light transmissive member, and includes a back surface in which a reference hole is formed. The reference hole includes a first edge and a second edge intersecting with each other. A reading sensor faces the back surface of the light transmissive member and the back surface of the peripheral member. The controller controls the reading sensor to read a reading range including the reference hole to obtain a read image, and determines a reference position in the reading range based on the read image. The reference position is determined to an intersection between the first edge and the second edge. The controller sets a reading start position based on the reference position.

An image processing apparatus includes an image forming device, a reading device, and circuitry. The image forming device is configured to form a first pattern on a recording medium. The first pattern includes a plurality of patches in a plurality of tones. The reading device is configured to read the first pattern. The circuitry is configured to acquire read data of the first pattern from the reading device. The read data includes red, green, and blue (RGB) color space values. The circuitry is further configured to: correct the read data based on information indicating a relationship between a color and a position in the first pattern to reduce variation in readings due to a read position of the first pattern; convert the read data corrected into device-independent data; and adjust a color reproduction characteristic of the image forming device based on the device-independent data.