Abstract:
RGB filter set (520) and color estimation performance for RGB LED color sensing (500) is provided. A criteria function describing an error between desired color matching functions and a spectral response of an RGB filter set (520) is constructed. RGB filter set (520) response characteristics based on the criteria function are then determined. Finally, color estimation parameters for substantially optimal color estimation (500) with the RGB filter set (520) are determined based upon the determined RGB filter set (520) response characteristics. Computer readable code for constructing a criteria function is provided. Computer readable code for determining RGB filter set (520) response characteristics is also provided. Finally, computer readable code for determining color estimation parameters is provided.
Abstract:
A method, apparatus and computer-readable medium allows users to measure a lighting condition of an object. In one embodiment, at least one user visually compares colored materials against a displayed color sample. Users may adjust the color of the displayed color sample by changing corresponding attribute values until the displayed color sample appears to substantially match the colored material. Once users indicate that they have established a color match between a displayed color sample and a colored material, the spectral irradiance value of the substantially matched color sample is calculated. The spectral irradiance value represents a measurement of the lighting condition in a particular room.
Abstract:
The invention relates to a method and apparatus for determining the color and/or composition of a material. A sample of the material is illuminated with at least three illumination bands singly or in combination, said illumination bands collectively substantially spanning at least the visible range. The light reflected or transmitted by the sample is measured with at least four light detector elements responsive to light in wavelength bands which substantially span the visible range when the sample is illuminated. The measured reflected or transmitted light is compared to the light reflected or transmitted by a reference material of known apparent emissivity or transmissivity and the apparent emissivity or transmissivity of the sample is calculated therefrom.
Abstract:
In the color imaging system (100), multiple rendering devices are provided at different nodes (102, 104) along a network (11). Each rendering device has a color measurement instrument for calibrating the color presented by the device. The rendering device may represent a color display in which a member surrounds the outer periphery of the screen of the display and a color measuring instrument is coupled to the first member. The color measuring instrument includes a sensor spaced from the screen at an angle with respect to the screen for receiving light from an area of the screen.
Abstract:
The stack reflectance is predicted from an on-line, wavelength dependent measurement of the sheet reflectance and the on-line measurement of the sheet opacity at a wavelength interval. The stack reflectance Rst is then used to predict and/or control stack color, preferably by using the parameter K/S = (1-Rst2)/2 Rst.
Abstract:
A method as well as a system to measure melanopic irradiance in a physical environment are provided. A camera is used to capture a panoramic image, which is calibrated to tristimulus values, and used with the spectral power distribution of the light sources to derive the melanopic dose rate.
Abstract:
A color identifying system, a color identifying method and a display device are provided. The color identifying system comprises an image acquiring unit (1), a color analyzing unit (2) and an information output unit (3); the image acquiring unit (1) is configured to acquire an image of an object to be identified; the color analyzing unit (2) is configured to extract profiles of the pattern regions of the object to be identified, and analyze colors of the pattern regions, to determine overall color information of the object to be identified; and the information output unit (3) is configured to output the overall color information of the object to be identified. The color identifying system can help a color vision defective person to identify color of an object, which is greatly convenient to production and life of the color vision defective person, and thus significantly improving quality of life of the color vision defective person.