An image processing device is configured to perform: reading an image of an original while a light emitting portion emits light with a first lighting color to acquire first image data representing the image; storing the first image data in a memory; executing a recognition process for recognizing an ID photograph in the image represented by the first image data; in response to determining that the ID photograph is recognized, outputting the image represented by the first image data; in response to determining that the ID photograph is not recognized, switching a lighting color of the light emitting portion from the first lighting color to a second lighting color different from the first lighting color; and reading the image of the original while the light emitting portion emits light with the second lighting color to acquire second image data representing the image.

An estimated image data calculator is configured to calculate, as estimated image data, for each of image data of respective colors outputted from an imaging element, on the basis of a pixel value of a first pixel on one of two lines adjacent to each other in the image data, and a pixel value of a second pixel on the other of the two lines and adjacent to the first pixel, image data of a non-reading region between a reading region in a document corresponding to the one of the two lines and a reading region in the document corresponding to the other of the two lines. A pixel value correcting unit is configured to correct at least one of the pixel value of the first pixel and the pixel value of the second pixel on the basis of the estimated image data.

An imaging apparatus for use with a subject may include a light source structured to irradiate the subject with a yellow light, a magenta light and a cyan light at a delayed illumination timing; and a plurality of photodetectors structured to detect the intensity of the light coming from the subject when the yellow light is irradiated, the intensity of the light coming from the subject when the magenta light is irradiated, and the intensity of the light coming from the subject when the cyan light is irradiated.

The present disclosure relates generally to digital watermarking for retail product packaging. A digital watermark can be carried in different color channels, and at with different signal polarities. Detection can utilize different illumination sources or image sensors with various filters to highlight signal in one or more of the channels.

A linear image scanner capable of digitizing three-dimensional surfaces according to the photometric stereo technique has a linear type imaging sensor, a scanning plane, an optical system, an optical axis, a scan line, a lighting system with at least four independently controllable light sources arranged so that each light source enlighten the scan line from a different direction. At least two first light sources are arranged symmetrically respect to the vision plane and at least two second light sources are arranged symmetrically respect to the moving plane and so that the at least two first and two second light sources radiate the scan line from at least four different directions with uniform light intensity and uniform incident angles of the light sources over the entire length of the scan line. A scanning method is also described.

A scanner is disclosed. The scanner includes a light source to emit light of a first color during a first turn-on period and emit light of a second color during a second turn-on period; a sensor to receive light from a scanning area, in response to the light of the first color directed to the scanning area, during a first sensing period, and receive light from the scanning area, in response to the light of the second color directed to the scanning area, during a second sensing period; and a controller to control the timing of the first turn-on period within the first sensing period and the second turn-on period within the second sensing period.

An image reading apparatus includes a gray reference member, a reading unit, an adjusting unit, a calibration unit, a storage unit, and a control unit. The control unit is configured to execute a first preprocessing and a second preprocessing. The first preprocessing includes: acquiring first black data from one line worth of image data; acquiring white data; calculating white-black difference data; acquiring first light gray data; and calculating first light gray-black difference data. The second processing includes: acquiring second black data from the one line worth of the image data; acquiring second light gray data; calculating second light gray-black difference data; calculating a change ratio by dividing the second light gray-black difference data by the first light gray-black difference data; and calculating calibration data by multiplying the white-black difference data by the change ratio. Shading of the image data is calibrated in response to the calibration data.

An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array and a reflective plate are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member is disposed on the side of the LED array. The light-guiding member includes a direct emission unit disposed between an illumination range y centered on a document reading position and the LED array and an indirect emission unit disposed between the reflective plate and the LED array, a light incidence face of the direct emission unit and a light incidence face of the indirect emission unit are disposed at mutually different position around the LED array, and the LED array is disposed on a side of an interior angle formed by the light incidence faces.

A control system controls an image forming unit that includes a charging device, an image bearer to be charged by the charging device, a light-emitting device array including a plurality of light emitting devices, and a driving causing the light emitting devices to emit light to form a latent image on the image bearer. The control system includes a storage unit, a corrector, and a controller. The storage unit is configured to store a light-amount correction value of each of the light emitting devices. The corrector is configured to correct a pixel value of each pixel in image data, based on the light-amount correction value of each light emitting device stored in the storage unit. The controller is configured to control the driver to cause each light emitting device to emit light based on image data for which a pixel value of each pixel has been corrected.

An illuminating device capable of stably illuminating an irradiated object such as a document while suppressing light loss with a simply structure is provided. An LED array and a reflective plate are disposed sandwiching a slit (St) through which light reflected by a document MS passes and a light-guiding member is disposed on the side of the LED array. The light-guiding member includes a direct emission unit disposed between an illumination range y centered on a document reading position and the LED array and an indirect emission unit disposed between the reflective plate and the LED array, a light incidence face of the direct emission unit and a light incidence face of the indirect emission unit are disposed at mutually different position around the LED array, and the LED array is disposed on a side of an interior angle formed by the light incidence faces.