An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.

An image processing method includes acquiring a captured image that has been generated by imaging through an imaging optical system inclined relative to an imaging plane, acquiring inclination information of the imaging optical system, acquiring aberration information of the imaging optical system, and performing image restoration processing on the captured image based on the aberration information. The image restoration processing includes a setting of a correction amount of the captured image according to the inclination information.

A method of balancing responses of a plurality of sensor chips arranged generally in a linear array comprising: exposing the plurality of sensor chips to an absence of illumination; measuring a dark response of each photosensor of a plurality of photosensors; positioning a calibration piece within a field of view of the plurality of sensor chips other than a calibration sensor chip; illuminating a calibration standard and the calibration piece with a light source; measuring a light response of each photosensor of the plurality of photosensors; applying an offset to the light response of each photosensor of the plurality of photosensors by subtracting the dark response of each photosensor of the plurality of photosensors to obtain an offset light response for each photosensor of the plurality of photosensors; calculating a mean offset light response for each sensor chip of the plurality of sensor chips by averaging the offset light response for each photosensor of the plurality of photosensors in each sensor chip of the plurality of sensor chips; calculating a modified light response for each photosensor of the plurality of photosensors by modifying the offset light response for each photosensor of the plurality of photosensors based on the mean offset light response of the sensor chip comprising the respective photosensor, the mean offset light response of the calibration sensor chip, an initial mean offset light response of the sensor chip comprising the respective photosensor, and an initial mean offset light response of the calibration sensor chip; and, applying a first gain to the offset light response of each photosensor of the plurality of photosensors based on the modified light response of each respective photosensor to obtain a corrected light response of each photosensor of the plurality of photosensors.

An original image is read as an aggregate of a plurality of pixels in which adjacent pixels have different colors (R, G, and B) in a main scanning direction and in a sub-scanning direction, and the read pixels of the respective colors are stored in a line memory in association with information on relative positions of the pixels with respect to another pixel. Then, the stored pixels are sorted so that pixels having the same color are adjacent to each other, and an abnormal pixel (dust) not present in the original image is detected based on the state of the sorted pixels. With this, the dust not present in the original image is detected without increasing the cost, and the dust is corrected without forming a conspicuous trace of correction.

An image processing apparatus includes circuitry to receive visible image data obtained by reading of a subject with a sensor having sensitivity to visible light in a visible wavelength range and invisible image data obtained by reading of the subject with a sensor having sensitivity to invisible light in an invisible wavelength range. The circuitry generates image data for displaying, in a designated color, a portion of the visible image data corresponding to a designated region of the invisible image data. The designated region has an absorption rate equal to or higher than a predetermined absorption rate.

An image processing apparatus processes image data to be used in a printing apparatus configured to perform forward and backward scan printing by using a print head in which nozzle arrays corresponding to multiple colors are aligned. The image processing apparatus includes: a setting unit configured to set a first control parameter in a case where image data to be processed does not include a line portion and to set a second control parameter in a case where the image data to be processed includes a line portion, the second parameter being different from the first control parameter; and a processing unit configured to perform, for the image data to be processed, processing to suppress a difference between a color printed in a forward scan and a color printed in a backward scan based on the control parameter set by the setting unit.

In one implementation, a system for interpolating pixel values includes a receiver engine to receive a plurality of scan lines each captured using only two of three different colors of lights from a scanner, wherein each scan line comprises received pixel values for the two different colors of lights used to illuminate the plurality of scan lines, an interpolate engine to interpolate, using the received pixel values for the two different colors, pixel values for the third one of the three different colors by for each scan line to result in a color map, and a display engine to cause to display information relating to an image including the received pixel values and the interpolated pixel values for the three different colors for the plurality of scan lines.

An image processing apparatus specifies, from among target pixels in a target image, first pixels related to a first color, and determines whether a specific condition is met for each peripheral pixel of the target pixel. The specific condition includes a condition that each peripheral pixel is a candidate for a pixel representing one of colors different from the first color. The apparatus specifies, as a second pixel related to a second color, each peripheral pixel meeting the specific condition. The apparatus performs an image process on target image data by using specified first and second pixels to generate processed image data. In a processed image, first processed pixels correspond to the specified first pixels and have the first color, and second processed pixel correspond to the specified second pixels and have the second color.

A document reading unit includes an R light source, a G light source, a B light source, a UV light source, a lighting control unit, a first photoelectric conversion element, a second photoelectric conversion element, a lens, and an output unit. The first photoelectric conversion element includes an M filter. The second photoelectric conversion element includes a G filter. The output unit outputs outputs of the first photoelectric conversion element and the second photoelectric conversion element at the time of simultaneous lighting of the R and G light sources and an output of the first photoelectric conversion element at the time of simultaneous lighting of the B and UV light sources as the image data, and outputs an output of the second photoelectric conversion element at the time of simultaneous lighting of the B and UV light source as fluorescent color data indicating a fluorescent color region.

A scanner system including a generating unit configured to selectively execute either a first process of generating image data from a conveyed document conveyed by a conveyance device, synthesizing the scanned images, and generating image data, or a second process of generating image data from a placed document set on a scanning platen; the second process scanning by a method that, compared with the first process, is less affected by deviation of the document perpendicularly to the scanning platen.