A controller of an image reading device performs search for an edge candidate position inward from an edge portion in a main scanning direction of analysis image data in an extraction process of extracting a document region from read image data. When the retrieved edge candidate position corresponds to a dirt position, the search is continued whereas when the retrieved edge candidate position does not correspond to the dirt position, the document region is extracted from the read image data at the retrieved edge candidate position.

A reading device includes an illuminator, an imaging device, a memory, and a detector. The illuminator illuminates an object to be read with light in an invisible wavelength range. The imaging device captures an image of the light reflected from the object to be read, within the invisible wavelength range. The memory holds a reference value of the object to be read. The detector detects a state of the object to be read, based on a difference between a level of a reading value of an invisible image captured within the invisible wavelength range and a level of the reference value.

An inspection device includes an image reader that generates a scan image, an inspector that inspects an inspection target image formed on a storage medium, by comparing a scan image with a reference image, a storage that stores the reference image, and a hardware processor that stores into the storage the reference image generated as the scan image by reading with the image reader an image formed on a recording medium by the image former on a basis of a second print job for generating the reference image, determines whether the reference image stored in the storage satisfies a predetermined condition when a data amount of the reference image stored in the storage becomes equal to or larger than a predetermined amount, and deletes the reference image determined to satisfy the predetermined condition from the storage.

Printers capable of determining a media type of a media and associated methods are provided. An example method includes scanning a media with a verifier associated with the printer to generate at least two consecutive windows of the media. The example method further includes determining a vertical length of a captured image based on a comparison of image characteristic values captured in the at least two consecutive windows. The example method further includes determining a media characteristic associated with the media based at least on the captured image and the vertical length and one or more stored media profiles. The example method further includes calibrating the printer based on the media characteristic.

Printers capable of determining a media type of a media and associated methods are provided. An example method includes scanning a media with a verifier associated with the printer to generate at least two consecutive windows of the media. The example method further includes determining a vertical length of a captured image based on a comparison of image characteristic values captured in the at least two consecutive windows. The example method further includes determining a media characteristic associated with the media based at least on the captured image and the vertical length and one or more stored media profiles. The example method further includes calibrating the printer based on the media characteristic.

An information processing apparatus performs acquiring measurement results obtained by measuring a characteristic of a recording medium a plurality of times; inputting information corresponding to a type of the recording medium; acquiring an extraction range of the type indicated by the information, among extraction ranges set to respective types of recording media for determination of a type; setting, based on the measurement results and the type, a parameter for correcting the measurement results to reduce difference between the measurement results and the extraction range; correcting, by using the parameter, measurement results obtained by measuring a characteristic of a recording medium to be recorded; and extracting a candidate type of the recording media, the measurement results, based on the corrected measurement results and the extraction range.

Printers capable of determining a media type of a media and associated methods are provided. An example method includes scanning a media with a verifier associated with the printer to generate at least two consecutive windows of the media. The example method further includes determining a vertical length of a captured image based on a comparison of image characteristic values captured in the at least two consecutive windows. The example method further includes determining a media characteristic associated with the media based at least on the captured image and the vertical length and one or more stored media profiles. The example method further includes calibrating the printer based on the media characteristic.

A placement detection system includes: a placement table; an imaging device that images an object placed on the placement table through the placement table to generate an input image; and a control device that receives the input image. The control device identifies a higher-level pixel having a pixel level higher than or equal to a predetermined pixel level in the input image, sets a threshold value of the higher-level pixel, and sets a threshold value of a target pixel other than the higher-level pixel to a lower value than the threshold value of the higher-level pixel in accordance with a distance between the higher-level pixel and the target pixel. The control device binarizes a pixel level of the target pixel in accordance with the threshold value of the target pixel to produce a binarized image and detects a shape of the object by using the binarized image.

A control unit of an image reading apparatus acquires, at an upstream position in a medium transportation direction of an abnormality determination area set for a leading-edge area of a medium, a distance WL from a center position in a medium width direction intersecting with the medium transportation direction to one edge in the medium width direction and a distance WR from the center position to the other edge in the medium width direction, and compares a value R that is a ratio between the distance WL and the distance WR or a difference therebetween with a threshold R0 determined in advance.

An image forming apparatus includes an image forming section, a case section, a conveyance section, a controller, an acquiring section, and storage. The controller controls the image forming section and the conveyance section according to mechanical settings information corresponding to a type of the sheet. The acquiring section acquires an identification image for identifying the type of the sheet. The storage stores therein mechanical-settings-information candidates and registered images associated with the mechanical-settings-information candidates. The controller determines whether or not a matching image exists when a sheet is loaded in the case section. Here, the matching image is a registered image matching the identification image of the registered images. The controller adjusts mechanical settings information based on a mechanical-settings-information candidate associated with the matching image of the mechanical-settings-information candidates when determining that the matching image exists.