822 results about "Colorimetry" patented technology

A multi-vision system includes chromaticity sensors for performing colorimetry of a plurality of display units. From colorimetry results obtained from the chromaticity sensors, a color conversion coefficient calculation unit inside a color calibration unit calculates the color conversion coefficient that is characteristic of each display unit. Calculated color conversion coefficients are stored in a color processing unit. The color calibration for this multi-vision system displays representing colors without a color conversion, and from colorimetry results of the representing colors for all the display units, a target color is decided automatically. For all display units, the color conversion coefficients are automatically calculated so that the representing colors are able to be displayed as a target color.

A color display system providing reduced observer metameric failure for a set of target observers, comprising an image forming system having narrow-band primaries. A data processing system is used to implement a method for color correcting an input color image having input color values adapted for display on a reference display device having a plurality of input color primaries. A metamerism correction transform is applied to the input color image to determine an output color image having output color values in an output color space appropriate for display on the image forming system. The metamerism correction transform modifies colorimetry associated with the input colors to provide output color values such that an average observer metameric failure is reduced for a distribution of target observers.

An object of the present invention is to provide a green pigment for a color filter, capable of displaying the chromaticity coordinates not to be displayed by the conventional green pigments, having the excellent color strength as a green color which is not excessively strong in a blue tinge, and a high transmittance, and moreover, to provide a photosensitive color composition, a pigment dispersion, a color filter and a liquid crystal panel, using the above-mentioned green pigment. In order to achieve the above-mentioned object, the present invention provides a green pigment for a color filter comprised of a phthalocyanine green pigment and capable of expressing a region of xy-chromaticity coordinate enclosed by predetermined equations 1, 2 and 3 defined by the XYZ color system of the CIE when the green pigment is solely subjected to colorimetry. Moreover, using the above-mentioned green pigment, it provides a photosensitive color composition capable of forming a color filter having a wide color reproduction range and a high transmittance. Furthermore, it provides a color filter having a wide color reproduction range and a high transmittance with a green pixel formed using the above-mentioned photosensitive color composition, and a liquid crystal panel using the color filter.

An image forming apparatus has: a recording head for forming an image on a recording medium; a color correction processing device which performs a color correction processing with respect to an input image data; an image output controller which controls the recording head according to the image data after performing the color correction processing in such a manner that the image corresponding to the image data is formed on the recording medium; a patch forming controller which controls the recording head so as to form a patch for colorimetry on the recording medium; a memory device for storing an output condition for forming the image, and measured results of the patch for colorimetry formed under the output condition; and a correction data change device which changes a correction data used for the color correction processing performed by the color correction processing device, when difference between the measured results of the patch for colorimetry that are obtained by forming the patch for colorimetry and performing colorimetry of that formed patch before starting of a printing job or during performing the printing job and the measured results of the patch for colorimetry that are stored in the memory device exceeds a predetermined acceptable range.

A method for color correcting an input color image having input color values adapted for display on a reference display device having a plurality of input color primaries to account to provide reduced observer metemaric failure on a narrow-band display device. A metamerism correction transform is applied to the input color image to determine an output color image having output color values in an output color space appropriate for display on the narrow-band display device. The metamerism correction transform modifies colorimetry associated with the input colors to provide output color values such that an average observer metameric failure is reduced for a distribution of target observers, and is formed responsive to a distribution of perceived color differences for a set of input colors that are determined for a set of target observers.

A dental colorimetry apparatus that allows the color balance of an entire row of teeth to be checked is provided. The invention provides a dental colorimetry apparatus 2 including a multiband-image storing section 21 storing images of teeth in association with information about the positions of the teeth in row of teeth; a contour-line extracting section 25 for extracting contour lines of the teeth from the images of the teeth; a rectangle-setting section 27 for setting rectangles in the images of the teeth so as to include the contour lines extracted by the contour-line extracting section 25 and so as to circumscribe at least both sides of the teeth; and an image-generating section 29 for generating a row-of-teeth image by arranging the images of the teeth based on the information about the positions of the teeth in the row of teeth so that the rectangles adjoin each other.

The invention provides a color calibration system capable of performing color calibration with high accuracy and simply. The color calibration system (100) in accordance with a preferred embodiment of the present invention comprises a display device (12) provided with a color sensor (12c) for detecting a color temperature and illuminance of ambient light (14), a microcomputer (12b), and a colorimeter (13) for performing colorimetry on a display screen (12a) of the display device (12) from the outside. The microcomputer (12b) calculates a target value by using a preset calculation equation and a detection result on the ambient light (14) detected by the color sensor(12c). Then, the microcomputer (12b) automatically performs color calibration of the display device so that a colorimetry result obtained by the colorimeter (13) may agree with the target value.

The invention discloses a method for RGBW-type four-primary-color display gray scale combination conversion. The method comprises the steps: based on the color gamut matching principle, through the rational colorimetry model, calculating the color gamut of the original RGB three-primary-color display in the L*a*b space as the source color gamut, and using the color gamut of the RGBW four-primary-color display in the L*a*b space as the target color gamut; and mapping the source color gamut to the target color gamut one to one by using the rational color gamut matching algorithm, and then performing the color gamut space conversion, and finally realizing the matching conversion from RGB to RGBW gray scale combination. Compared with the traditional RGBW conversion algorithm, the scheme is capable of strictly calculating tristimulus values of each gray scale combination and converting to the L*a*b space, using the color reappearance ability of RGBW in the greatest degree through the color gamut matching, guaranteeing that the hue angle is not changed before and after the conversion in the conversion processes, and reducing the color distortion.

An image forming apparatus includes a printing unit that prints at least one object image using a color material; a color information acquiring unit that acquires color information of the object image; and a control unit that starts one of colorimetry of the object image using the color information acquired by the color information acquiring unit and color adjustment of the printing unit after a variation amount of color information of the object image measured at different points of time is equal to or smaller than a predetermined threshold.

A system wherein already-existing computing and memory resources in an electronic camera are used to process an image for printing. Rather than duplicating, in printers, computing and memory resources that are already in digital cameras, significant computing and memory resources need exist only in the camera. A digital camera can support many different printers, each with its own set of parameters such as for example print size, pixel size, colorimetry, sensitometry, and artifacts compensation. Printer parameters are uploaded from the printer to the camera to provide a basis for image processing specific to the associated printer; whereby compensation may be done for variations in the printer characteristics which may occur as a result of printer manufacturing variations, and further so that compensation may be done for different media types which may be installed in the printer.

An apparatus for measuring the reflectance properties of an object having a front reflecting surface and at least one back reflecting surface. The apparatus includes a sample stage for placement of the object, a light source, a detector configured to detect reflected light from the object, and a positioning device configured to provide a plurality of angular positions for the light source and the detector relative to the object on the sample stage such that incident light on the object is specularly reflected towards the detector and the reflected light received at the detector includes a front surface reflection from the object and at least one back surface reflection from the object. The method includes illuminating the object at varying angles of incidence, collecting reflected light from the front and back reflecting surfaces of the object at respective specularly reflected angles, wavelength resolving the reflected light into a color spectrum, and analyzing an intensity of the color spectrum as a function of wavelength.

The invention discloses a method for achieving light distribution in a full color gamut scope based on PWM four primary color LEDs. The method comprises the following steps of (1) obtaining the photometric and colorimetric performance parameters of each single color; (2) calculating the corresponding tristimulus values of each single color; (3) according to that the luminous flux and the duty ratio is in proportional relationship, deriving the function relationship between the luminous flux and the duty ratio; (4) obtaining the mathematical model of the three primary color light mixing and the proportion of each single color light in the mixed light, and obtaining the color mixture equation set; (5) determining the target color coordinates and color temperature of the mixed light; (6) deriving the function relationship among the chromaticity coordinates, the luminous flux and the duty ratio; and (7) determining the luminous flux of the target color temperature, calculating each duty ration of RGBW, and finally performing outputting, so as to achieve the light distribution object. The method is featured in that the product cost is low, the adjustable color temperature precision is high, the mode is simple, the illumination is comfortable, the usage effect is good, and the like.

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.

A system wherein already-existing computing and memory resources in an electronic camera are used to process an image for printing. Rather than duplicating, in printers, computing and memory resources that are already in digital cameras, significant computing and memory resources need exist only in the camera. A digital camera can support many different printers, each with its own set of parameters such as for example print size, pixel size, colorimetry, sensitometry, and artifacts compensation. Printer parameters are uploaded from the printer to the camera to provide a basis for image processing specific to the associated printer; whereby compensation may be done for variations in the printer characteristics which may occur as a result of printer manufacturing variations, and further so that compensation may be done for different media types which may be installed in the printer.

A color calibration system in accordance with a preferred embodiment of the present invention comprises a display device provided with a color sensor for detecting a color temperature and illuminance of ambient light, a microcomputer, and a colorimeter for performing colorimetry on a display screen of the display device from the outside. The microcomputer calculates a target value by using a preset calculation equation and a detection result on the ambient light detected by the color sensor. Then, the microcomputer automatically performs color calibration of the display device so that a colorimetry result obtained by the colorimeter may agree with the target value.

Provided is a method for measuring temperature of long-gap air arc plasma, relating to heat plasma temperature measurement field. The method is based upon spectrum diagnosis principle of air arc plasma radiation, shooting long-gap air arc image through an attachment double-narrow-band-pass filter and a calibrated color CCD high speed image acquisition system, and storing in BMP format which data is not compressed; correcting pixel value of arc color bitmap file responded with two feature center wavelengths to original data of arc radiation intensity; obtaining arc radial light intensity distribution through Abel transformation, then calculating arc plasma projection temperature distribution or arc plasma temperature radial distribution by a colorimetry of spectrum relative intensity, and rebuilding tridimensional temperature field. The method of the present invention can measure open arc plasma temperature in air of several meters accurately and provides an important plasma parameter for researching microcosmic mechanism of long-gap air arc.

The invention discloses preparation of hydrophilic polymer and application thereof in detecting mercury ions based on the change of fluorescence and color, particularly a rhodamine B hydrazide grafted hydrophilic polymer probe applied to the detection of mercury ions in aqueous medium based on the change of fluorescence and color and a kit and test paper applied to the detection of the mercury ions by using the probe, belonging to the technical field of material preparation and heavy metal ion detection. The polymer containing a rhodamine chromophore is prepared by subjecting rhodamine B hydrazide and propylene oxide on the side chain of polyvinylpyrrolidone-glycidyl methacrylate which is a water-soluble polymer to ring-opening reaction, has good water solubility and can be applied to selectively detecting the mercury ions by using visual colorimetry and fluorescence detection. The probe realizes the high-sensitivity and high-selectivity rapid quantitative or semi-quantitative detection of the trace mercury ions in the aqueous medium, has a simple synthetic route, low cost and convenience of use, is applicable to amplified synthesis and actual production and has great application prospects in the field of medicine, biology and environmental science and the like.

Colorimetry values when a display unit displays tone signals R(i), G(i) and B(i) (where a number i is a tone value; 1<i<n) are acquired. The colorimetry values are defined using a device independent color of a CIE-XYZ color space, and are composed of three attributes X (i), Y (i) and Z (i). Calculation based on the three attributes is performed to generate a tone profile, that is, an adjusting condition. Utilizing the tone profile, a tone-adjusting unit adjusts color data. Color temperature is kept flat, color reproducibility in halftone (for example, a skin color of a natural image) and display quality can be improved.

The invention relates to a method for detecting trivalent arsenic in water body through a colourimetry by using protoheme peroxidase catalytic activity, chlorhematin has horseradish peroxidase activity, under the existence of hydrogen peroxide, a chromogenic substrate 3,3', 5,5'-tetramethyl benzidine (TMB) can be catalyzed to generate an oxidation reduction reaction, the solution have variable color change by naked eyes, the addition of a nucleic acid aptamer can inhibit catalytic activity, after adding the trivalent arsenic in the solution, the catalytic activity obtains recovery, so that the color of a whole system enables substantial change, the absorbance and trivalent arsenic concentration at 442nm present a direct proportion relation, thereby the method can be used for detecting the trivalent arsenic of the water body. The detection method provided by the invention has the advantages of high sensitivity and good selectivity, the lowest detection limit is 1ppb, the operation is simple, and a large-scale apparatus is not required, and the method can be used for detecting the trivalent arsenic in drinking water.

The invention discloses a colorimetric detection method for glucose. The colorimetric detection method for the glucose comprises the steps of pretreating a sample, adding a buffer solution to dilute the sample, mixing the sample with glucose oxidase, performing reaction to generate hydrogen peroxide, then adding a molybdenum disulfide solution, a developing agent and the buffer solution, and measuring the content of the glucose in the sample by a visual colorimetry method or through an ultraviolet-visible light spectrophotometer after mixing reaction is implemented. According to the colorimetric detection method, glucose oxidase is used for oxidizing the glucose to generate the hydrogen peroxide, and molybdenum disulfide serving as a catalyst is used for catalyzing the hydrogen peroxide to generate color development reaction with the developing agent; the glucose concentration is measured in a semi-quantified manner by the visual colorimetry method or is measured in a quantified manner through the ultraviolet-visible light spectrophotometer. According to the colorimetric detection method for the glucose, the problems of high operation requirement on glucose detection, complicated detection process, high detection cost, long detection time, high background interference and the like in the prior art are solved; the method disclosed by the invention is low in cost and easy to operate; the glucose content of the sample can be quickly detected in a visual manner.

The invention provides a hypochlorous acid fluorescent probe with quick response and high selectivity and sensitivity by molecular structure design, as well as a preparation method thereof and application of the hypochlorous acid fluorescent probe to detection of hypochlorous acid in an aqueous solution and a cell. The fluorescent probe can be applied to detection of the hypochlorous acid in the aqueous solution or a biological system, and detection comprises fluorescence detection, cell imaging and visual colorimetry. The fluorescence intensity forms linear positive correlation with the concentration of the hypochlorous acid within a certain concentration range, and the concentration of the hypochlorous acid can be quantitatively measured. The hypochlorous acid fluorescent probe is easy to synthesize, and a posttreatment process is relatively simple; selective and rapid detection of the hypochlorous acid molecular probe is realized, the selectivity is good, and the hypochlorite fluorescent probe is high in resistance to interference of other molecules, is a simple, rapid and sensitive hypochlorous acid molecular specific detection reagent, and has broad application prospect in the field of biomolecular detection.

A differential imaging colorimeter system and method which utilizes a RGB color camera to provide accurate differential colorimetry which can be employed as a portable, dedicated, offline system. The system utilizes a portable processor such as a laptop computer, a hand-held imaging head comprising a color camera, a lens, a plurality of white LED lights, a base plate defining an imaging region, housed in an opaque cover, wherein the imaging head provides a RGB video image to the portable processor; and a software program loaded on the portable processor for applying a geometric transform on an image obtained with the imaging head to match a stored reference image. The computer calculates differential colorimetry values to compare current images with a stored reference image.

There are disclosed a profile producing method and a profile producing apparatus for producing a profile representative of the association between the colors on a color image and the color data in accordance with which the color image is outputted, in an output device such as a color printer and a printing machine for outputting color images in accordance with image data including color data. From among a plurality of existing profiles (tables), a suitable table is selected in accordance with an evaluation based on dot gains. A new profile is produced in accordance with the selected table and colorimetry data of a color chart involved in small number of patches.

The system for selecting a best device for rendering a color document involves first determining the types of color data included in the color document to be printed. Once the type of color data has been determined, the color characteristics are matched against the strengths of the available output devices to obtain a list of devices best suited for this particular color print job. At least one device from the list of best devices is selected and the color document is rendered onto the selected device. Preferably, the types of color data involved are determined by the mix of defined colorimetry and undefined colorimetry in the color document. Alternatively, the types of color data are determined by analyzing the colorspaces in the document (i.e., RGB, CMYK, LAB, XYZ, etc.), and the embedded profiles, if any, in the document (e.g., sRGB, SWOPCMYK, Euroscale). In the instance wherein a number of devices match the criteria for selection, only those devices which honor embedded color profiles are selected for documents containing embedded profiles. Alternatively, only those devices are selected that produce a consistent rendering across multiple color spaces and profiles for documents with a mix of color spaces and profiles. Selecting the best device may also depend on whether the type of print job is considered to be Job-Balancing or Job-Splitting. With Job-Balancing, at least one of the metrics is used: (i) Intersection Gamut Volume, (ii) Gamut Similarity, or (iii) Mismatch Between Document Colors and Intersection Gamut for device selection. With Job-Splitting, at least one of these metrics are used: (i) Individual Gamut Volume, or (ii) Mismatch Between Document Colors and Device Gamut. Colorimetric definition of the selected colors can be retrieved from either an embedded source profile or by default and mapping the colors to the output gamut.

The invention discloses a combined reagent for detecting the peroxide value of edible oil and fat and a detection method thereof. The combined reagent comprises a solvent, a reduction reagent and a chromogenic reagent, wherein the solvent is a polar organic solvent for dissolving a sample; the reduction reagent is used for reducing peroxide in the to-be-detected sample; and the oxidized reduction reagent reacts with the chromogenic reagent to produce a colored precipitated complex compound, namely ferric thiocyanate. The invention further discloses the detection method using the combined reagent. The detection method has the benefits that a colorimetry principle is adopted by the combined reagent, and the peroxide value of the to-be-detected sample is detected through reagent discoloration and chroma intercomparison, so that the detection method is simple, convenient and rapid and has high accuracy.

A novel modular bench-top bispectral fluorescence colorimeter and technique embodying in self-contained housing excitation and emission monochromator, preferably with fiber light guide interconnections, and processing for accurately determining the bispectral radiance factors defining the true color of fluorescent materials and the like, and enabling a variety of data presentation formats descriptive thereof.

Printing can be properly performed on a print medium other than print media preset in accordance with print modes of a printer. Specifically, when the print medium other than the print media preset in accordance with the print modes is used, patches are printed on the print medium in each combination of the ink ejection amount and the number of passes, and information regarding each evaluation of granularity and banding based on colorimetry of the patches is obtained for each combination of the ink ejection amount and the number of passes. Next, a combination of the maximum ink ejection amount and the maximum number of passes is selected from the combinations that each evaluation of the granularity and the banding satisfies a certain level. Then, a print mode having a combination nearest the combination is selected from the plurality of print modes.

There has been a room for improvement of calibration accuracy. The predetermined color patches are printed on the basis of the patch image data for printing a plurality of patches of which the color gradation values have been changed for each ink color used in the printing device, the color values of the color patches are acquired by resorting to the colorimetry of the printed color patches, the color values corresponding to all the color gradation values of the color correction table are interpolated and acquired by referring the acquired color values and by using the predetermined function, the color values corresponding to all the color gradation values acquired by the interpolation and the standard values that are the color values of the standard printed results are contrasted, and on the basis of the contrast results, a color correction table for correcting the color image data is produced in such a way that printed results equivalent to the standard printed results corresponding to the color image data of a freely chosen color gradation value may be obtained by the printing device.