Abstract:
A method of improving an initial color filter comprises a numerical generation of sinusoidal spectra. Two steps of selecting said spectra are then executed. The first selection is carried out according to a criterion of calorimetric similitude with respect to the initial filter. The second selection is carried out according to the capacity of dummy filters corresponding to each spectrum to restore hues in a natural manner. To do this, observations of samples of hues through each dummy filter are simulated numerically, using a color appearance model to take account of a visual perception of a human observer. In this way, an improved filter is determined, which has a color close to that of the initial filter and which affords a natural rendition of hues.
Abstract:
An object is to represent the difference of colors of a vital tooth and a tooth sample in a highly precise manner and to compare the colors in a relatively easy manner. The invention provides a dental colorimetry apparatus including a shade-guide-information storage unit configured to store acquired image data of a tooth sample and calorimetric information of each pixel acquired on the basis of the acquired image data; a pixel extracting unit configured to acquire reference calorimetric information used as a reference when carrying out a comparison with the vital tooth, to compare the reference calorimetric information and the calorimetric information for each pixel of the tooth sample, and to extract pixels whose comparison results satisfy a predetermined condition; an image-generating unit configured to create a sample comparison image in which a third pixel group including pixels extracted by the pixel extracting unit and a fourth pixel group including pixels that are not extracted are represented by different colors; and a display device configured to display the sample comparison image created by the image-generating unit.
Abstract:
The present invention is composed of a computer positioned at a basal portion of an apparatus for conducting image processing and counseling processing; a first image display means for displaying a computer-processed image to a subject, mounted upright in the computer, a second image display means for displaying the computer-processed image to a counselor, mounted upright in the computer so that a display screen thereof is directed in a direction opposite the first display means; and photographic means, positioned near the first image. display means, for photographing a subject directed in a direction of the first display means and feeding a facial image of the subject into the computer, thus making the apparatus small in scale and simple in composition, and suitable for a counselor to provide counseling on make-up to a subject.
Abstract:
Small, fast, and inexpensive in-line spectrophotometers can produce in-line spectrums of a substrate before or after printing on the substrate. In-line spectrums are generally far less complete than a reference spectrum produced with a large, slow, and expensive reference spectrophotometer. An in-line spectrum can be mapped to a reference spectrum using a variety of known algorithms. However, the mapping is erroneous when the media substrate type changes. Reference transform matrices and in-line transform matrices can correct the erroneous mapping.
Abstract:
The present invention is composed of a computer positioned at a basal portion of an apparatus for conducting image processing and counseling processing; a first image display means for displaying a computer-processed image to a subject, mounted upright in the computer, a second image display means for displaying the computer-processed image to a counselor, mounted upright in the computer so that a display screen thereof is directed in a direction opposite the first display means; and photographic means, positioned near the first image display means, for photographing a subject directed in a direction of the first display means and feeding a facial image of the subject into the computer, thus making the apparatus small in scale and simple in composition, and suitable for a counselor to provide counseling on make-up to a subject.
Abstract:
A system is provided that includes a first computer that can communicate with a second computer. The second computer sends information to the first computer that includes a desired ink color and optionally includes information of other desired ink properties. The first computer includes a database of data for predicting color data of ink formulations using a selected ink base color set, a software program for selecting an ink formulation based on data for a desired ink, and a software program for sending information to the second computer to display the color of the selected ink formulation on a color monitor connected to the second computer. The ink base color set can be selected to provide other desired properties for the ink, such as low cost, light fastness, or chemical resistance.
Abstract:
A semiconductor color sensor implemented without the use of color filters. Fabricating photodiodes using different semiconductor materials provide photodiodes with different sensitivities vs. wavelengths. A first embodiment uses photodiodes with different junction depths. A shallow junction depth produces a photodiode with its sensitivity peak in shorter wavelengths, while a deeper junction depth produces a photodiode with its sensitivity peak in longer wavelengths. Amorphous as well as crystalline structures may be used. A second embodiment uses photodiodes with different materials, such as Silicon-Germanium (SiGe) which has a longer wavelength peak sensitivity, and Silicon (Si) which has a shorter wavelength peak sensitivity in comparison. More than two photodiodes having different wavelength sensitivities may be used. Sensing current ratios between pairs of diodes allows color balance to be maintained.
Abstract:
A miniaturized spectrometer/spectrophotometer system and methods are disclosed. A probe tip including one or more light sources and a plurality of light receivers is provided. A first spectrometer system receives light from a first set of the plurality of light receivers. A second spectrometer system receives light from a second set of the plurality of light receivers. A processor, wherein the processor receives data generated by the first spectrometer system and the second spectrometer system, wherein an optical measurement of a sample under test is produced based on the data generated by the first and second spectrometer systems.
Abstract:
To determine spectra, integrated multiple illuminant measurements from a non-fully illuminant populated color sensor may be converted into a fully populated spectral curve using a reference database. The reference database is partitioned into a plurality of clusters, and an appropriate centroid is determined for each cluster by, for example, vector quantization. Training samples that form the reference database may be assigned to the clusters by comparing the Euclidean distance between the centroids and the sample under consideration, and assigning each sample to the cluster having the centroid with the shortest Euclidean distance. When all training samples have been assigned, the resulting structure is stored as the reference database. When reconstructing the spectra for new measurements from the sensor, the Euclidean distances between actual color samples under measurement and each cluster centroid are measured. The spectra are then reconstructed using only the training samples from the cluster corresponding to the shortest Euclidean distance, resulting in improved speed and accuracy.
Abstract:
A method of discriminating between road markings of at least two colours, comprises: capturing an image of a road and at least one road marking with a monochrome camera having a first colour response in a first area of a field of view of the camera and a second colour response in the second area of the field of view; and determining the change in intensity of the captured image of the road marking between the first and second areas. Apparatus for discriminating between road markings is also disclosed.