A method and an ambient light color sensor adapted to determine color of ambient light comprising a memory, a processor, and a light color sensor with a plurality of channels that detect light at different wavelengths. Wherein the memory comprises a calibration matrix determined by calibrating a test light color sensing device under at least one ambient lighting condition, and a normalized gain value for each channel determined by calibrating the ambient light color sensing device to an artificial light source. Wherein the processor receives the sensor readings from the light color sensor, normalizes each received sensor reading using the normalized gain value of a respective channel, determines at least one measured light color value that quantifies color of light from the normalized sensor readings, and determines at least one calibrated light color value by correlating the at least one measured light color value through the calibration matrix.

An illumination condition, which is used to irradiate a print product with light having illuminance higher than normal illumination, is derived based on exposure condition information at the time of photographing.

An image processing apparatus includes an acquisition unit configured to acquire a chromaticity value, which is a measurement result for a sheet to be measured, by using a sensor in which a light source has fixed characteristics; a designation unit configured to designate a condition under which the measurement result is acquired by the sensor; a determination unit configured to determine an optical brightening agent amount contained in the sheet; and a chromaticity value conversion unit configured to convert the chromaticity value, which is acquired by the acquisition unit, by using the condition designated by the designation unit and information about the optical brightening agent amount determined by the determination unit.

An ambient light color sensor adapted to determine color of ambient light and method for calibrating thereof. The ambient light color sensor comprises a sensor body having at least one diffuser and a light color sensing module disposed below the at least one diffuser. The light color sensing module comprises a plurality of channels adapted to detect light collected by the at least one diffuser at different wavelengths to produce sensor readings. The ambient color sensor is adapted to measure color of ambient light by storing a calibration matrix determined by calibrating a test light color sensor to a test ambient light source, receive the sensor readings from the light color sensing module, determine an interpolated spectral power distribution from the received sensor readings, convert the interpolated spectral power distribution to at least one measured light color value that quantifies color of light, and determine at least one calibrated light color value by correlating the at least one measured light color value through the calibration matrix. The sensor readings received from the ambient light color sensor and test sensor readings received from the test light color sensor during calibration thereof may be normalized by calibrating the ambient light color sensor and the test light color sensor to an artificial light source.

A method for building a security image for a security structure of a security document from multiplexing color images, including selecting a marking method capable of producing sets of colors on the security document comprising different colors that can be displayed according to illumination/observation modes of the security structure, establishing a plurality of color sets that can be displayed by the security structure in a plurality of the different illumination/observation modes, distributing the color sets in a plurality of groups of color sets, establishing combinations of groups of color sets having at least one color set in common across the number of different illumination/observation modes, selecting a combination of a group of color sets based on the number of desired illumination/observation modes and the number of colors per color image, and determining the color images to multiplex by means of the combination of the group of color sets selected.

A display and a color correction method are disclosed. The display includes a panel and a backlight module. The color correction method includes steps of: (a) sensing a real-time backlight intensity of the backlight module; (b) increasing a backlight intensity of the backlight module when the real-time backlight intensity is different from a standard backlight intensity of the backlight module; (c) sensing a compensated backlight intensity of the backlight module and estimating a first real-time color information of the panel according to the compensated backlight intensity and a first panel color characteristic information, wherein the first panel color characteristic information corresponds to the penetration characteristics of the panel; and (d) estimating a first color gain compensation value for the panel according to the first real-time color information and compensating the colors displayed on the panel when the panel displaying an image according to the first color gain compensation value.

A linear matrix circuit generates a second R signal, a second G signal, and a second B signal by performing a matrix operation of a correction coefficient of 3 rows3 columns including first to third correction coefficients, fourth to sixth correction coefficients, and seventh to ninth correction coefficients on a first R signal, a first G signal, and a first B signal. An R coefficient corrector performs correction so that the first correction coefficient to be multiplied by the first R signal is caused to be close to 1 and the second and third correction coefficients to be respectively multiplied by the first G signal and the first B signal are caused to be close to 0, as a first difference value obtained by subtracting the first G signal from the first B signal increases when the first difference value exceeds a first threshold.

A method for identifying light spot, image processing device, and image processing device, and non-transitory computer readable storage medium are disclosed herein. An example method involves: receiving a first image corresponding to a light spot image, wherein the first image is an image of the light spot image displayed in a first color space; converting the first image into a second image, wherein the second image is an image of the light spot image displayed in a second color space; and identifying the light spot with a target color in the second image according to a preset color identifying condition of the second color space.

A method for processing an image may include: collecting an ambient light spectrum while capturing an image (10); determining RGB tristimulus values corresponding to ambient environment of the captured image based on the collected ambient light spectrum and a color filter absorption curve (11); determining skin color coordinates based on the collected ambient light spectrum and a spectral absorption curve of a skin color model (12); and determining RGB values in the skin color model based on the RGB tristimulus values and the skin color coordinates (13).

Color filters are used for color images obtained using imaging devices such as conventional image sensors. Imaging elements with color filters are sold, and an appropriate combination of the imaging element and a lens or the like is incorporated in an electronic device. Only providing a color filter to overlap a light-receiving region of an image sensor reduces the amount of light reaching the light-receiving region. An imaging system of the present invention includes a solid-state imaging element without a color filter, a storage device, and a learning device. Since the color filter is not included, colorization is performed on obtained monochrome image data (analog data), and coloring is performed using an AI system.