Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.