224 results about "Color measurement" patented technology

The invention relates to the technical field of image processing, and discloses an image processing method and device for an image acquisition card, and the method comprises the steps: converting an input optical signal into original image data through a sensor array of the image acquisition card, and carrying out the preprocessing, and obtaining a preprocessed image sequence; constructing an image state space model and a color measurement noise model based on the preprocessed image sequence, and performing preliminary denoising on the preprocessed image sequence to obtain a bidirectional time sequence feature tensor; inputting the bidirectional time sequence feature tensor into an additive fusion bidirectional time convolutional neural network for feature extraction to obtain a comprehensive spatial-temporal feature and a confidence map; according to the method, gradient descent image processing parameter optimization is carried out according to the comprehensive spatial-temporal characteristics and the confidence map, optimal processing parameters of the image acquisition card are obtained, and a target output image is generated, and the method improves the image definition and the detail retention capability in a dynamic scene, and improves the robustness of image processing.

The invention discloses a method for dynamically monitoring the drying quality of fruits and vegetables by fusing chromatic aberration-shrinkage rate analysis. The method comprises the following steps: placing a fruit and vegetable sample on a rotatable objective table, drying according to a preset program, and carrying out multi-angle shooting by using a digital camera according to a timestamp to obtain an RGB color image; the method comprises the following steps: preprocessing by an image analysis system, converting an image into a Lab chromaticity space, calculating a chromatic aberration value delta E and a comprehensive shrinkage rate S, integrating data to generate a change curve, and constructing an appearance form model. In actual drying, real-time data and the model are compared, and early warning is carried out when the color difference value exceeds 3.5 or the shrinkage rate deviation exceeds 15% and image acquisition is abnormal. The drying equipment is provided with a high-precision electric rotary objective table, a specific annular light source array, a high-resolution camera and a standard calibration color card, and illumination and color measurement accuracy is ensured through calibration. Through multi-step operation, accurate and dynamic monitoring of fruit and vegetable drying quality is achieved, and drying process optimization is assisted.

An image forming apparatus includes an image former that prints a color chart on a sheet, an in-line colorimeter that performs color measurement of color patches formed on the color chart, and an image processor that performs color adjustment based on colorimetric values of the color patches formed on the color chart. The image processor combines multiple divided colorimetric data obtained by performing color measurement of color patterns into which a chart is divided, the chart in which color patches are arrayed to be common to the color chart, and obtains colorimetric values of the color patches formed on the color chart from the multiple divided colorimetric data combined.

The invention discloses a fruit pulp color measurement method and system, and relates to the technical field of computer vision and image processing.The method comprises the steps that an original fruit pulp image is collected through a depth camera under the specific illumination condition, a mask image is generated through labeling, a data set is constructed in combination with metadata, and the data set is expanded through rotation and overturning; the method comprises the following steps: performing color correction, specific transformation and standardization processing on a three-dimensional grid model, storing the processed three-dimensional grid model into a database, dividing a data set into a training set and a test set, inputting the training set into an optimized YOLOv8s deep learning model for training, obtaining a pulp region image after a set threshold value is met, obtaining a CIELAB parameter by converting a color space, performing slicing operation on the three-dimensional grid model to generate three-dimensional slices, and obtaining a pulp region image. According to the method, three-dimensional color distribution data is obtained, pulp area images, CIELAB parameters and the three-dimensional color distribution data are stored in a database, a fruit variety table is constructed, rapid contrastive analysis of pulp colors of different fruit varieties is achieved, and powerful support is provided for fruit quality research and the like.

The invention discloses a semi-supervised non-contact neonatal jaundice home intelligent early warning method based on image calibration, and the method comprises the steps: building a camera response function database, and building a color constancy depth model and a skin region segmentation network; designing a strong and weak enhancement strategy by using a large amount of label-free home data, constructing a time and context comparison learning module, and performing self-supervised training on a feature encoder; a small amount of labeled hospital data and a large amount of unlabeled family data are combined, and semi-supervised fine tuning is realized through pseudo label generation and supervised comparative learning; image sequences continuously uploaded by a user are input into the model, multi-day prediction of the bilirubin level is achieved, prediction uncertainty is quantified in combination with a Bayesian method, the risk boundary is dynamically adjusted, and personalized early warning is provided. According to the method, a user does not need to use a physical colorimetric card, color measurement errors caused by model differences of mobile equipment and variability of household illumination are inhibited from a data source, and the accuracy and robustness of subsequent jaundice assessment are improved; through a training framework combining self-supervised pre-training and semi-supervised fine tuning, the understanding ability and generalization performance of the model for the sequential characteristics of jaundice are improved.

The invention relates to the technical field of color difference correction, in particular to a method for correcting a color measurement result of a colorimeter, which comprises the following steps of: acquiring a sample Lab value, calculating a coordinate index correction matrix, acquiring an original coefficient, inputting segmented regression, extracting characteristics, calculating deviation weighting, and acquiring a regional offset; the method comprises the following steps: acquiring a neighborhood compensation channel offset, calling an offset to adaptively correct the neighborhood compensation channel offset to obtain a boundary front value, performing boundary verification limiting amplitude callback processing to obtain an output result, and updating a knowledge base to accumulate deviation incremental counting to optimize the color measurement precision, in the invention, through regionalization analysis and a piecewise linear regression model, the accuracy and flexibility of color difference correction are improved, and the color measurement accuracy is improved. Through the weighting processing and neighborhood compensation technology, correction inaccuracy caused by large errors is effectively reduced, it is ensured that the corrected measurement value does not exceed a reasonable range, an unstable correction result of a traditional method is avoided, adaptability is high, fault tolerance is high, measurement consistency and reliability of the colorimeter are improved, and the method is suitable for popularization and application. The method has obvious advantages especially in a complex chromatic aberration correction scene.

The invention discloses a yarn photographing and color measuring method and system based on texture feature weighted correction, and belongs to the technical field of computer digital image processing, and the method comprises the steps: building a photographing and color measuring system; shooting a digital image of the yarn sample by using a digital camera; segmenting the image by using a K-means clustering algorithm, and accurately separating yarns from a background region; the center line of the yarn is extracted through a skeletonization algorithm; a digital camera is used for shooting a training sample digital image, and the RGB value of each color block is extracted; constructing a spectrum reconstruction matrix based on the training sample; reconstructing the spectrum of each pixel point in the center line area of the yarn through the spectrum reconstruction matrix; calculating chromaticity data corresponding to the reconstructed spectrum according to a colorimetry theory; and finally, in combination with a texture weighting method, yarn color correction measurement data is obtained. The method overcomes the defect that an existing photographic color measurement method neglects the influence of texture features on a color measurement result, and the photographic color measurement result of the yarn is combined with real visual perception.

The invention discloses an on-line color measurement method. The method comprises the steps of optical system correction, image acquisition, image correction preprocessing, chromatic aberration calculation, ink channel ink quantity adjustment and continuous measurement adjustment. The method has the beneficial effects that the defect that traditional equipment only monitors a color control strip area is overcome, the problem that the image deviates from a design pattern due to factors such as a printing position, paper deformation and lens distortion can be effectively solved through spatial correction of the image, and after pixel-level registration, the color control strip area of the image can be effectively corrected. The image and the design image are in pixel-by-pixel correspondence, so that the detection accuracy is improved, reference correction is implemented by setting a fixed color block, and a color block strip is arranged in the field of view of the imaging camera as a correction color code, so that the imaging camera can synchronously obtain the correction color code in the process of obtaining the image in real time, and the detection accuracy is improved. And the color difference value of the image can be accurately calculated, so that accurate correction can be effectively carried out.

The invention discloses a colorimeter stimulus value calibration method, system and device and a readable storage medium. The colorimeter stimulus value calibration method, system and device are used for improving the color measurement accuracy of a colorimeter. The method comprises the following steps: establishing a standard stimulation value database; establishing a to-be-calibrated colorimeter database; dividing the to-be-calibrated colorimeter database into a plurality of hexahedrons in a space coordinate system; obtaining a test tristimulus value of the test color through the to-be-calibrated colorimeter; obtaining a target hexahedron to which the test tristimulus value belongs from the plurality of hexahedrons; calculating relative deviation stimulus values of the test tristimulus values in all axial directions of the space coordinate system based on the target hexahedron; obtaining a corresponding standard stimulation value from a standard stimulation value database according to each end point of the target hexahedron; performing preliminary calibration on the relative deviation stimulation value by using a trilinear interpolation method and a standard stimulation value to obtain an intermediate stimulation value; and performing brightness calibration on the intermediate stimulation value to obtain a target stimulation value.

An extremely fast optical measurement method combines a chromatic confocal distance measurement with a chromatic confocal color measurement of a partially reflective test surface. A corresponding measuring device uses at least two monochromatic emitters, particularly single- or multi-mode laser diodes, as a light source.

A particle size of soil is measured, a color measurement value related to a color of the soil is measured, and corrosion of a steel material buried in the soil is estimated from the particle size and the color measurement value. In the measurement of the color measurement value, a color value is measured as the color measurement value. In the corrosion estimation, a corrosion rate is obtained from the measured particle size, a corrosion rate magnification is obtained from the measured color measurement value, a corrected corrosion rate is obtained by multiplying the corrosion rate by the corrosion rate magnification, and the corrosion of the steel material is estimated according to the obtained corrected corrosion rate.

The invention relates to the technical field of multi-spectral colorimeter inter-table difference reduction, and discloses a method and device for reducing multi-spectral colorimeter inter-table difference, electronic equipment and a medium, and the method comprises the steps: measuring a set number of color cards to obtain measurement matrixes of different colorimeters, and then selecting one colorimeter from the preset colorimeter group as a standard colorimeter, taking the rest colorimeters as to-be-calibrated colorimeters, and establishing a conversion relation between the standard measurement matrix and the to-be-calibrated matrix. The method has the beneficial effects that the consistency between the to-be-calibrated colorimeter and the standard colorimeter is greatly improved, the calibration procedure is simplified, the reliability and consistency of the calibrated colorimeter in practical application are also improved, the applicability of the multispectral sensor in the corresponding color measurement field is enhanced, and the method is suitable for popularization and application. The cost performance and application universality of the multispectral colorimeter are remarkably improved, and a more stable and accurate color measurement solution is provided for various industries.

An adjusting system for Electronic Chart Display and Information System (ECDIS) and a setup method of monitor. The setup method is applied to a monitor of the ECDIS and includes the following. A testing mode is selected from a day mode, a dusk mode, and a night mode, and a color setting corresponding to the testing mode is obtained. The monitor is controlled to display a first color according to the color setting. A brightness difference between the first color displayed by the monitor and a target color is measured and calculated, and the color setting of the monitor is adjusted accordingly until the brightness difference meets a brightness difference condition. A contrast difference between the first color displayed by the monitor and the target color is measured and calculated, and the color setting of the monitor is adjusted accordingly until the contrast difference meets a contrast difference condition.

This invention provides an inkjet printing apparatus, an inkjet printing method, and a program that enable both color measurement and efficient printing. [Solution] The inkjet printing apparatus of the present invention comprises a printing unit for producing printed materials, and an inline colorimetric unit for detecting a colorimetric chart in a colorimetric printout on which a colorimetric chart is printed. The colorimetric chart includes colorimetric patches and position patches. The inline colorimetric unit reads information other than the colorimetric value from the position patches while the colorimetric chart is waiting for color stabilization.

The utility model relates to the technical field of color measuring equipment, and discloses a novel high-resolution liquid transmittance tester which comprises a shell, a light path system is arranged in the shell, and a measuring and detecting assembly is arranged on one side of the light path system; the light path system comprises a reflector, a lens cone is arranged on one side of the reflector, a support is arranged on the side, away from the reflector, of the lens cone, and the support is used for installing a grating; the measuring and detecting assembly comprises a measuring and collecting interface, a USB interface is installed on one side of the measuring and collecting interface, a processing unit is arranged on the same side of the measuring and collecting interface and the USB interface, and the processing unit adopts a high-performance microprocessor. According to the utility model, through the improved distribution among the grating shaft, the lens cone, the reflector and other components, the equipment has excellent resolution, can meet the requirement of spectrum fine structure analysis compared with the traditional equipment with insufficient fineness, and is more suitable for the fields of scientific research, industrial detection and the like.

A color measurement apparatus includes an opening portion forming member that is a member in which an opening portion for causing light arriving from a measurement target to enter inside the apparatus is formed, and that is arranged on a bottom surface at a time of measurement performed by the apparatus, the opening portion for causing the light arriving from the measurement target to enter inside the apparatus, an incident light processing portion that processes light incident through the opening portion, and a battery that supplies power to the incident light processing portion, in which in a view from a first direction that is a vertical direction intersecting with the bottom surface and an upper surface which is a surface on an opposite side from the bottom surface, the incident light processing portion and the battery have an overlapping part.

The invention discloses a dot matrix display character recognition method based on color features, and the method comprises the steps: S1, receiving an original image and a region of interest as input, and removing non-target pixels in the image through background filtering; s2, the filtered effective pixels are sent to a K-Means clustering algorithm for color quantization, and main color clusters in the image are automatically summarized; s3, in a color measurement matching stage, determining a target color representing a character foreground by calculating the Euclidean distance between the center of each color cluster and a preset target color in an RGB space; and S4, performing foreground mask reconstruction based on a matching result, generating a binary image only containing target character pixels, and sending the binary image to a standard OCR engine for final character recognition. According to the method, target color characters can be effectively isolated, background interference is reduced, and a foreground mask with high contrast and high fidelity is finally generated for a subsequent OCR engine to use.

The application discloses a color camera color correction method, system, device and medium, the correction method comprises: through shooting the area light source to complete the lens shadow correction and white balance correction of the color camera; the XYZ value of the area light source is measured using a color measuring device, and the light source correction coefficient corresponding to the different areas of the area light source is calculated; the transmission color card is placed, and the transmission light of the area light source passing through the color card is measured using the color measuring device to obtain target color data; the color camera is started and the measured color data is collected, so that the correction matrix is fitted based on the target color data. The application carries out color correction of the color camera based on the color card under the irradiation of the actual area light source, avoids the influence of the actual area light source on the true value of the color card provided by the manufacturer, solves the area light source shielding problem during the measurement of the target color data through the transmission color card, solves the uniformity problem of the area light source through the light source correction coefficient, and significantly improves the accuracy of the color correction as a whole.

To provide a measurement method and measurement system, each enabling film thickness of copper oxide to be measured more simply and in shorter time.SOLUTION: In a measurement method according to one embodiment, a mathematical expression indicative of a relationship between a film thickness of copper oxide equal to or less than 15 nm and color information on the copper oxide are prepared; color of a surface of copper being a measurement object is measured, and the color-measurement result is applied to the mathematical expression, and thus the film thickness of the copper oxide formed on the surface is calculate. In a different another embodiment, the color of the copper oxide is measured based on a method complying with any of DIN5033 Teil7, JIS Z 8722 Condition c, ISO7724 / 1, CIE No.15(2004), or ASTM E 1164(SCI). In another measurement method, a mathematical expression is prepared which is indicative of a relationship between color information on copper oxide in which an L value is larger than 53 and less than 82, an a value is larger than 17 and less than 45, and a b value is larger than 24 and less than 43 and a film thickness of the copper oxide; a color of the surface of the copper oxide of the measurement object is measured; and a film thickness of the copper oxide formed on the surface is calculated by applying a color-measurement result to a mathematical expression.SELECTED DRAWING: Figure 1

The present application relates to the technical field of image analysis, and specifically provides a special-shaped sample color measurement defect correction and error compensation method and system based on image analysis, which comprises the following steps: collecting an original image of a sample to be measured and preprocessing the original image to obtain a to-be-measured image; matching the to-be-measured image with a pre-constructed color measurement defect standard database, identifying defect features and positions through an image analysis algorithm, matching a correction strategy to obtain a correction image of an effective color measurement area; adjusting color measurement instrument parameters according to the defect features, collecting color values of the effective area, and performing mean value processing to obtain original average color values; extracting image shape, material and color core features, matching a color compensation algorithm in association with the original average color values, and completing compensation to obtain target color values. The method realizes full-process automation of special-shaped sample color measurement, effectively eliminates collection deviations caused by shapes, improves color measurement precision and efficiency, and adapts to industrial high-precision control requirements.

An information processing apparatus performs, as a first specification processing, specification processing of specifying, in a color chart composed of a plurality of rows each including a plurality of color patches, one candidate row that is a candidate for a color-measured row in which a user performed color measurement, based on colorimetric values of the candidate row and reference values of respective color patches in the color chart; and performs specification processing of specifying, in a case where it is not possible to specify only one candidate row in the first specification processing, the color-measured row with use of information other than colorimetric values.

To execute appropriate color comparison even when a reference object has color irregularities.SOLUTION: A color comparison device 1 executes: a reference information acquisition step (step S1) of acquiring colorimetric values of a plurality of reference points A1-Am in a reference object having color irregularities; a target information acquisition step (step S2) of acquiring colorimetric values of a plurality of measurement points B1-Bm in a target; a calculation step (step S4) of combining a reference point An and a measurement point Bn, and calculating the Euclidean distance L on color space coordinates between the combined reference point An and measurement point Bn; and a determination step (step S6) of comparing the Euclidean distance L calculated on the basis of at least any one combination of the combinations of the reference point An and measurement point Bn with a predetermined threshold Lth, to determine whether or not the color of the reference object and the color of the target are similar to each other.SELECTED DRAWING: Figure 3

The present invention relates to an apparatus (10) for measuring colour particularly for digital printing, comprising: a) handling means (17) having at least three degrees of freedom, said handling means (17) comprising a support base (18), an articulated group (19) and an end element (20), b) a spectrum measuring device (11), being mounted on said end element (20) of said handling means (17), in turn comprising - a box-like body (12) having a first face (13) intended, in use, to face a test chart (T), said test chart (T) including a plurality of adjacent colour area, said first face (13) being provided with a window (15); - a spectral sensor (16) configured to measure the colour spectrum data of a light (L) received through said window (15), the received light (L) being a light reflected from said test chart (T) or a light transmitted through said test chart (T); c) a first image acquisition device (23) configured to capture one or more images (IM), or a video, of at least a portion of said test chart (T), d) an electronic control unit (24) connected to the handling means (17), to the spectrum measuring device (11) and to the first image acquisition device (23); the electronic control unit (24) is configured to analyse the test chart (T) and to determ ine: - the type, the dimensions and the position of said test chart (T), - the position of each colour area of the test chart (T), - the motions of the handling means (17) for positioning the spectrum measuring device (11) in subsequent measurement positions.

The invention discloses a device and a method for evaluating the color of a photochromic material. The device comprises a movable sample fixing frame for controlling the distance from a sample to a light source; the illumination light source is used for controlling the illumination brightness and angle; and the movable optical observation equipment is used for recording the color changing and fading processes of the photochromic material at different distances. According to the invention, the color development characteristics of the photochromic material under the conditions of light sources with different color temperatures and illumination with different intensities can be tested without the interference of the excitation light source of the photochromic material.

The invention provides a production method and a production program product of a color measurement sheet, and a production method and a production program product of a printer. In the method for producing a colorimetric sheet, a specification of a size of a medium is received from among a plurality of sizes, and a colorimetric chart is printed on the medium of the specified size using a printer to produce the colorimetric sheet, when the size of the color measurement jig in a first direction, which is a direction in which the color measurement jig is used to move the color measurement instrument, is A, a value corresponding to the size of the color measurement instrument is B, and the size is set as a first size, a second size, A-B, and a third size in the descending order. When the size of the medium in the first direction is either the first size or the second size, the color chart in which the same number of color patches are arranged in the first direction is printed, and when the size of the medium in the first direction is the third size, the color patches are printed. If the second size is greater than the first size, a colorimetric chart in which a smaller number of color patches are arranged in the first direction than if the second size is present is printed.

The application discloses a double-optical-path spectrometer, a color measurement device and a calibration method, and relates to the field of color measurement devices. The color measurement device obtains reflected light of a measured sample and reflected light of a test light source, and inputs the reflected light into a first incident slit and a second incident slit of a spectrometer through a Y-shaped light path unit; the reflected light is incident on a grating through a lens; diffracted light spots returned by the grating are incident on a photosensitive surface of a sensor on the side of the incident slit through the lens; the photosensitive surface is provided with an aperture stop with a dislocation opening; and the photosensitive surface at each dislocation opening only receives light signals of one light path, so that the short-term repeatability of spectrophotometry is improved. When wavelength calibration is performed, light signals of a calibration light source are obtained through the Y-shaped light path unit; pixel position information of the collected light signals is obtained according to a sensor of the spectrometer; a fourth-order polynomial is used to fit wavelength data and the pixel position information; the correspondence between the pixels and the wavelengths is adjusted; and the wavelengths are calibrated, so that the short-term repeatability of spectrophotometry is improved.

An example electronic apparatus includes a display; a memory storing spectrum information of the display and color matching function (CMF) information related to the display; and a processor configured to, based on a test image being displayed through the display, obtain color measurement data based on color measurement of the test image, based on an image for converting into a non-fungible token (NFT) being selected and displayed through the display, obtain current setting information of the electronic apparatus, and obtain NFT by combining the color measurement data, current setting information of the electronic apparatus, spectrum information of the display, and CMF information related to the display with attribute information of the image.

The application discloses a kind of color measurement equipment and its support and control method, it is related to the technical field of color measurement equipment, support includes: support table, installation bracket, first drive unit, detection unit and control unit, support table has the sample placement part to be measured;Installation bracket is set on support table, and installation bracket can be close to or away from the sample placement part to be measured along the first direction;Installation bracket has the mounting structure for installing colorimeter probe;First drive unit is set in installation bracket;First drive unit is configured to drive mounting structure to move along the first direction;Detection unit is set in installation bracket;Detection unit is configured to detect the pressure that colorimeter probe receives;Control unit is electrically connected with detection unit;Control unit is configured to control the operating state of first drive unit based on the pressure that colorimeter receives.The application can prevent the sample to be measured from being deformed under pressure, improve the accuracy of color measurement data.

Disclosed are computer systems for color matching a printed layer of a thermoset three-dimensional printer according to a received indication of a desired final color property. A color material having a color property may be mixed with a thermoset coreactive composition such that the target object resulting from the extrusion of the thermoset coreactive composition of the thermoset three-dimensional printer obtains the desired final color property upon curing. The desired final color property may be obtained from color measurement of a reference object or may be selected by a user of the computer system. A dispensing machine may dispense and / or mix color material components according to a formulation for the desired final color property to generate a color material for mixing with the thermoset coreactive composition.

The invention provides a control device, a control method and a control program capable of performing color adjustment among a plurality of projectors in a short time. The control device includes a processor (51) that instructs the first projection device (10a) to project in a first color that is an adjusted color, acquires a color measurement value of light projected from the first projection device (10a) (XYZ first color PJ1), instructs the second projection device (10b) to project in the first color, acquires a color measurement value of light projected from the second projection device (10b) (XYZ first color PJ2), and acquires a color measurement value of light projected from the second projection device (10b). On the basis of a lookup table (62) for a first color indicating the relationship between the color adjustment parameter (P) and the position in the Lab color space (61), a color measurement value (XYZ first color PJ1) of the first projection device (10a), and a color measurement value (XYZ first color PJ2) of the second projection device (10b), a color adjustment parameter (Ppred) is determined such that the position of the color measurement value (XYZ first color PJ1) in the Lab color space (61) approaches the position of the color measurement value (XYZ first color PJ2) in the Lab color space (61).