A sensor array assembly including a first sensor array, a second sensor array and a mounting substrate. The first sensor array includes a first process direction width and a first photosite, while the second sensor array includes a second process direction width and a second photosite. The first and second sensor arrays are separately secured on the mounting substrate. The first photosite is in precision alignment with the second photosite.

Signal detection and recognition employees coordinated illumination and capture of images under to facilitate extraction of a signal of interest. Pulsed illumination of different colors facilitates extraction of signals from color channels, as well as improved signal to noise ratio by combining signals of different color channels. The successive pulsing of different color illumination appears white to the user, yet facilitates signal detection, even for lower cost monochrome sensors, as in barcode scanning and other automatic identification equipment.

An image processing apparatus includes a processor configured to acquire an image and designate whether the image is a color image or a monochrome image based on a comparison of a feature quantity of the image and a threshold value. A storage unit stores the threshold value. A display unit displays whether the image has been designated a color image or a monochrome image by the processor. An input device is configured to receive user input for changing whether the image is designated a color image or a monochrome image. The processor changes the threshold value stored in the storage unit when the user input changes whether the image is designated a color image or a monochrome image.

A method is provided for constructing a composite image. The method comprises illuminating an object with light of a particular spectral band, capturing a digital image of the illuminated object using a monochromatic image sensor of an imaging device to obtain a monochrome image, repeating the steps of illuminating and capturing to obtain a plurality of monochrome images of the object illuminated by light of a plurality of different spectral bands, processing the plurality of monochrome images to generate image data for one or more output channels, and generating a color composite image from the image data. The color composite image comprises the one or more output channels.

By overlapping lighting timings of light sources that emit lights of a plurality of different wavelength bands including a wavelength band of at least a visible light region and an infrared light region, the lights of the plurality of the different wavelength bands including the wavelength band of at least the visible light region and the infrared light region are emitted on a banknote while securing an overlap in timings thereof. Moreover, by using light receiving elements each including a bandpass filter that allows only light of a wavelength range that corresponds to the wavelength band of each of the light sources, received light intensities of the light of the wavelength range that corresponds to the wavelength band of each of the light sources are acquired simultaneously, and image data are formed based on the received light intensity of every acquired wavelength band.

An image scanner is configured to: while changing a reading position by a position changer and sequentially emitting light of each of three colors in a turn-on sequence from a light source to a document, control a line sensor to read reflection light of emitted light, thereby acquiring gradation image data including gradation values of three colors for each pixel in one line; determine whether a top color shift occurs in the gradation image data at a determination position; in response to determining that the top color shift occurs at the determination position, replace gradation image data at the determination position with black image data; determine whether a bottom color shift occurs in the gradation image data at the determination position; and in response to determining that the bottom color shift occurs at the determination position, replace gradation image data at the determination position with white image data.

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.

Examples herein involve retrieving a color transformation from a highlighter color transform, and processing an image using the color transformation to enhance highlighter colors in the image, the image scanned by a scanner using strobed illumination.

Disclosed is a method of processing data from an image scanner for reducing image artefacts. The image scanner comprises a first image sensor arranged to: record a first set of lines, the first set of lines comprising a plurality of pixels representing recorded intensities of a first colour, record a second set of lines, the second set of lines comprising a plurality of pixels representing recorded intensities of a second colour; and record a third set of lines, the third set of lines comprising a plurality of pixels representing recorded intensities of a third colour. The method comprises the steps of: processing at least two of the first, the second or the third set of lines to create a first combined set of lines and filtering said first combined set of lines to filter out image artefacts creating a first filtered combined set of lines.

An image acquisition apparatus, an image forming apparatus, and a control method of the same are provided. An image acquisition apparatus includes an image sensor in which a red element outputting a signal corresponding to a red light, a green element outputting a signal corresponding to a green light, and a blue element outputting a signal corresponding to a blue light are arranged in a predetermined pattern, a driving unit configured to move the image sensor to a plurality of positions; and an image processor configured to receive a signal output from the red element, the green element and the blue element in the plurality of positions, respectively, and configured to acquire an image of an object by combining the received signal.