103 results about "Colorimeter" patented technology

To provide a computer color-matching apparatus comprising (A) a colorimeter, (B) a micro-brilliance-feeling measuring device, and (C) a computer in which a plurality of paint blends, the color data and micro-brilliance-feeling data corresponding to each of the paint blends, and the color characteristic data and micro-brilliance-feeling characteristic of a plurality of full-color paints are entered and a color-matching-calculation logic operates and a computer color-matching method for brilliant paints of executing the following steps by the computer color-matching apparatus: (1) a step of measuring the paint film of a reference color by a colorimeter to obtain the color data of the reference color, (2) a step of measuring the paint film of a reference color by a micro-brilliance-feeling measuring device to obtain micro-brilliance-feeling data of the reference color, and (3) a step of comparing the color data and micro-brilliance-feeling data of the reference color with the color data and micro-brilliance-feeling data corresponding to the paint blend previously entered in a computer, and selecting a prospective paint blend.

A toner for developing an electrostatic image includes a binder resin, a colorant and a wax. The toner shows heat-absorption characteristics represented by a DSC heat-absorption curve obtained on temperature increase in a temperature range of 30-150 DEG C. by a differential scanning colorimeter (DSC). The DSC heat-absorption curve shows a maximum heat-absorption peak (P1) in a temperature range of 70-90 DEG C. The DSC curve also provides a differential curve showing a first maximum (Max1) on a lowest temperature side at a temperature (T1) of 50-65 DEG C., showing a second maximum (Max2) on a next lowest temperature side at a temperature (T2) of 65-85 DEG C., and showing a minimum (Min1) on a highest temperature side at a temperature (T3) of at least 95 DEG C. Because of the DSC heat-absorption characteristics, the toner exhibits excellent fixability (including anti-offset characteristic) over a wide temperature range and excellent continuous image forming characteristic.

An image forming apparatus includes: an image forming section; an image reading sensor and a colorimeter; a temperature sensor; a memory that stores a first color value and a second color value in a first color chart that has a larger number of patches than a second color chart; a processor that creates a scanner profile for converting a first color value into a second color value using color values obtained by the image reading sensor and the colorimeter, corrects the scanner profile according to the color values obtained by the image reading sensor and the colorimeter, and converts the first color value into the second color value using the corrected scanner profile.

The invention belongs to the technical field of food detection, and discloses a method for evaluating the browning degrees of Chinese chestnuts by using a colorimeter. The method comprises the following steps: (1) sample preparation, namely selecting more than two varieties of Chinese chestnuts, cutting the Chinese chestnuts by virtue of a sharp knife, and peeling off episperm and endopleura, so as to obtain a sample to be detected; (2) colorimeter determination, namely selecting a diffuse reflection D65 light source, determining the sample to be detected, and recording data Delta Eab, Delta L, Delta a and Delta b; and (3) analyzing the data Delta L, and evaluating different browning degrees of the Chinese chestnuts by using the Delta L. According to the method, the browning degrees of the Chinese chestnuts are detected by taking the precision colorimeter as a tool; the numerical values Delta L which reflect the browning degrees of the surfaces of the cooked Chinese chestnuts can be quickly read by using the colorimeter; not only can subjective evaluation be avoided, but also further oxidative browning, which is caused in a long-term grinding process, can be avoided, the time for evaluating the browning degrees of Chinese chestnut kernels can be significantly shortened by virtue of the colorimeter, and concrete data for evaluating the browning degrees can be quickly obtained.

A method for measuring chroma value by colorimeter to solve the drawbacks of conventional technologies, such as an inaccurate illuminant and the filter of color-matching function is difficult to be deposited and manufactured within an filter mod colorimeter, and an expensive spectrometer used within an spectrum mode calorimeter. The present invention does not need the spectrometer and the filter of color-matching function, and can measure an accurate chroma value of an object by using a multi-band illuminant illuminating the object and a power meter. Besides, the multi-band illuminant can be adjusted the illumination condition of standard illuminator under different color temperature, and measure the chroma value of the object under different color temperature. The accuracy of the measured chroma value is up to the level of the spectrum mode colorimeter, and the price is cheaper than the spectrum mode calorimeter.

An image reading apparatus capable of detecting correct color tones of an image printed on a sheet is described. The image reading apparatus includes a scanner 100, a colorimeter 103, a cooling device 145, a temperature control unit 111, and an image correction unit 113. While an image correction process is not performed, the temperature control unit 111 controls the cooling temperature to a first temperature for shifting the cooling device 145 to a predetermined cooled state. While the image correction process is performed, the temperature control unit 111 controls the cooling temperature to a second temperature for making the temperature of the sheet uniform. The image correction unit 113 obtains, while the temperature control unit 111 controls the cooling temperature to the second temperature, the correction amount of the image based on the colorimetric measurement result of the colorimeter 103 and the reading result of the scanner 100.

When a grid point that is the object to be mapped is present in a first division region a color of which has lightness equal to or higher than the lightness at the maximum chroma point in the color gamut and has chroma higher than the chroma at that point, the intersection of a straight line connecting the grid point to the maximum chroma point and an achromatic axis is calculated and a point having lightness equal to or higher than the lightness of the intersection is set as the focal color. Then, the intersection of a straight line connecting the object grid point to the focal color and the boundary of color gamut is set as an output color for the grid point. The output colors are prevented from being separated into color on the high and on the low lightness sides with respect to the maximum chroma point.

The invention provides a bubble flowing resistant colorimeter cell capable of simultaneously detecting absorbance and fluorescence, which belongs to optical elements for carrying out absorbance analysis and fluorescence analysis on liquid samples in the field of analysis instruments. The bubble flowing resistant colorimeter cell comprises a black base, a sample inlet tube, a light through hole passage, another light through hole passage and a sample outlet tube, wherein a cylindrical light through hole passage is arranged in the black base in a diagonal line direction; the other light through hole passage is arranged in a vertical direction of a central axis of the light through hole passage; the sample inlet tube and the sample outlet tube, which are used for a detected liquid to flow through, are arranged on the black base; the detected liquid flows in from the sample inlet tube, flows through end walls of the light through hole passage and the other light through hole passage and flows out from the sample outlet tube so as to form a Z-shaped liquid passage structure. According to the invention, as one light through hole passage vertical to the other light through hole passage is arranged, detections, such as absorbance detection, fluorescence wavelength detection, can be simultaneously carried out; as the light through hole passage and the other light through hole passage are blocked up, the sample cannot enter between the light through hole passage and the other light through hole passage; and through the adoption of the Z-shaped liquid passage, small bubbles in the sample can be gathered at the top, so that a measuring error is reduced.

A method for quickly determining various ecdysis periods of river crabs is characterized by comprising the following steps of first opening a colorimeter to automatically conduct black-white board correction via a white board, after the correction, conducting standard measurement, adjusting a reading mode into a Lab mode, in which L indicates color lightness,+ means inclination to white, - means inclination to darkness, a indicates color green-red value, + means inclination to red and - means inclination to green indicating blue-yellow value, + means inclination to yellow and - means inclination to blue, taking out of a crab individual, wiping off a crab head, chest and back parts, reading blue-yellow value (b) of crab head-chest exoskeleton via the colorimeter, and making the following determinations according to the blue-yellow value (b): when b is no less than 7, the individual is in a proecdysis; when b is no more than 2, the individual is in ecdysis; and when b is more than 2 and less than 7, the individual is during the ecdysis. The method is simple and convenient to operate; no detection damages are caused to the crabs; and foundations are provided for crab breeding and management level.

The invention discloses a color difference analysis method which comprises the following steps: 1, constructing a color set with the number of colors not less than 20, the color set comprising 100% white, 100% red, 100% green, 100% blue, 100% cyan, 100% magenta and 100% yellow; 2, measuring color lumps displayed by a display to obtain CIEXYZ measured values; 3, converting the CIEXYZ measured values of seven colors in the CIEXYZ measured values in the step 2 to obtain CIEXYxy measured values, and taking an x component and a y component in the CIEXYxy measured values as chromaticity coordinatesof the seven colors in a CIEXy coordinate system; 4, converting all RGB color values in the color set into CIEXYZ reference values; 5, respectively converting the CIEXYZ measured values and the CIEXYZreference values into CIELab measured values and CIELab reference values; and 6, calculating the chromatic aberration between the CIELab measured values and the CIELab reference values. Meanwhile, the invention provides a display with a color difference analysis function. The color of the display can be visually and efficiently evaluated only by externally connecting a colorimeter, color difference calculation can be more accurate, and an evaluation result is more objective and real.

An image reading apparatus includes: a conveyor that conveys paper on which an image is formed along a conveyance path; a first guide member including a first opening on a reference surface opposed to the conveyance path that guides the conveyed paper; a first opposing member that arranges the image on the paper in a colorimetric range set in the first opening on the reference surface by pressing the reference surface via the paper to allow the paper to abut the reference surface; a second opposing member that presses the reference surface by a pressing surface including a calibrating member in a reference color to arrange the calibrating member in the colorimetric range; and a colorimeter arranged on a side opposite to the conveyance path across the first guide member that performs colorimetry on the image on the paper and the calibrating member arranged in the colorimetric range.

The embodiment of the invention provides an image quality detection method and device and an image quality detection report generation method and device for display equipment, and the detection method comprises the steps: receiving to-be-tested image quality detection parameters selected by a user in a first preset interface, and the image quality detection parameters at least comprise one of the following parameters: a color temperature parameter, a backlight parameter, a gamma parameter and a color gamut parameter; obtaining test data corresponding to the image quality detection parameters; outputting a test signal according to the test data so as to detect a predetermined pixel point; obtaining a detection result obtained by the colorimeter at the predetermined pixel point; and storing the detection result into a predetermined file. According to the embodiment of the invention, automatic detection of the display equipment is realized, a tester does not need to adopt signal generation equipment to adjust signals in real time to detect the display equipment, each display equipment only needs very short detection time and does not depend on a large amount of manpower any more, and the accuracy is greatly improved.