Ricoh Company, Ltd.

Naoki Goh

Masayuki Yabuuchi

Hiroshi Ishii

Atsushi Yoshida

Osamu Kizaki

Hideki Hashimoto

Ayumu Hashimoto

Masaki Nagase

Naoki Asaba

Masafumi Kishi

Hiroki Shirado

Satoshi Hatanaka

Shiho Shimosaka

An image scanning device including an image sensor, an operation unit, and circuitry. The circuitry acquires reference-image data and comparative-image data output from the image sensor when a predetermined time elapses after acquiring the reference-image data. The circuitry further divides each of the reference-image data and the comparative-image data into a plurality of image areas, extracts a feature point of a given pixel for each of the plurality of image areas of each of the reference-image data and the comparative-image data, compares pixel values of feature points in the same coordinate to determine a difference in pixel value, identifies an image area including at least one feature point having a difference in pixel value, and identifies a direction of flip of pages of the document based on the image area including the at least one feature point having the difference in pixel value.

Image scanning device, image forming apparatus, image scanning method, and image scanning program

An image reading device includes an imaging device to capture an image of a document placed below the imaging device to generate a document image and output an image signal based on the document image, circuitry to determine a size of a fed-sheet based on information on the fed-sheet, the fed-sheet being a sheet to be formed with the document image, generate a frame image for the document image, the frame image having a size equal to the size of the fed-sheet, and synthesize the frame image with the image signal output from the imaging device to generate a synthesized image, and a display to display the synthesized image.

Image reading device, image forming apparatus, method of displaying document image, and non-transitory recording medium

An image reading apparatus includes: a plurality of light sources to emit light to a target to be read from a plurality of different irradiation positions; an illumination controller to sequentially and alternately turn on or off the plurality of light sources with a blinking cycle not perceptible to the human eye; an image capturing device to photoelectrically convert, pixel by pixel, reflected light of the light emitted to the target from the plurality of light sources to capture a plurality of read images; a memory to store one or more read images of the plurality of read images being captured; and a synthesizer to synthesize preset regions of the plurality of read images using the one or more read images stored in the memory to generate a synthesized read image representing the target, the preset region of each of the plurality of read images having an image level change caused by reflected light that is smaller than a threshold.

Image reading apparatus, image forming apparatus, image reading method, and recording medium

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Tokyo, Japan

Naoki Goh