222 results about "Colour difference" patented technology

The invention provides a colour calibration method for multiple cameras. The method comprises the following steps of: extracting edges of a picture acquired by each camera, extracting colour information along the edges, and recovering a response function of the camera according to the extracted colour information; selecting a reference camera from the multiple cameras, and searching colour valuescorresponding to one colour in the pictures acquired by different cameras from a real world by a 24-colour-palette-based colour matching method or a general colour matching method; and calibrating the colours of the cameras by a multi-camera brightness layer calibration method according to the response functions of the cameras and information about colour matching between the reference camera andother cameras. The colour calibration method reduces the colour difference of shot pictures, guarantees the consistency of the colours, provides a solid guarantee for the subsequent three-dimensionalreconstruction work, and enhances the reconstruction precision.

The invention disclose a video image off-color detection method based on a Lab space and a correlation function. The method comprises the following steps: 1), obtaining two adjacent frames of an image of a detection video; 2), performing conversion from an RGB space to the Lab space; 3), correspondingly dividing the image into sub-blocks; 4), calculating variances and correlations of the corresponding sub-blocks; 5), calculating aberrations of the corresponding sub-blocks; and 6), solving off-color factors by combining correlation coefficients with the aberrations, and making a comparison with a set threshold so as to determine whether an off-color phenomenon exists. The video image off-color detection method based on the Lab space and the correlation function has the advantages of good uniformity, quite low equipment reliance, good applicability, and higher reliability and accuracy.

A computer-implemented method of image processing for materials analysis is provided. At least three image datasets are obtained, these representing intensity values of image pixels and being in common spatial registration. The image datasets are processed so as to assign a comparison measure to each pair of image datasets, the comparison measure for a given pair of image datasets being representative of the difference between the spatial intensity information within the pair. A number of image datasets are then selected using the comparison measures. A colour difference measure is defined which represents the difference between pairs of colours of a colour set. Colours are assigned to the selected image datasets such that pairs of the selected image datasets which have substantially different spatial intensity information are assigned respective colours which have a substantially different colour difference measure. A number of the selected image datasets are then combined together to form an output colour image dataset for the formation of a colour image. The combination is such that each pixel of the colour image takes on a colour according to the relative intensities and colours of the selected image datasets so that if the pixel intensity of one dataset is substantially greater than the sum of the pixel intensities for all the other selected datasets, then the output colour in the respective part of the image will substantially match the colour assigned to that image dataset.

The invention discloses a method for predicating an overdying formula of colored fabric. The method comprises the following steps of: 1), establishing a basic database which comprises the base fabric data of the colored fabric and the basic color sample data which is required when the colored fabric is dyed by various dyes in different concentration gradients; 2), determining a corresponding basic database according to a target color; 3), matching the target color by using a computer and making a color sample according to the formula; 4), inputting the obtained color sample into the computer, providing a color correcting formula by the computer, and continuously making the color sample according to the color correcting formula; and 5), repeating the step 4) till the color difference between the color sample and the target color meets the requirement, and stopping making the color sample. By the method, the K(absorption) / S(scattering) value of per unit concentration of various dyes of colored fabric dyeing can be well met, and the color matching speed and the one-time accuracy rate are improved.

The invention relates to the field of glass making and in particular relates to super-white and super-thick float glass and a preparation method thereof. A raw material formula of the super-white and super-thick float glass is designed, an edge roller control technology is adopted, from a first pair of edge controllers to the last pair of edge controllers, an inward component force produced by virtue of speed difference and negative angle of each pair of edge rollers is utilized for controlling the speed difference to be 15-50m / h; runner temperature is controlled to be (1100-1105)+ / -1 DEG C; molten tin slot outlet temperature is controlled to be 625+ / -5 DEG C; pulling amount of each edge roller is controlled to be 560-610t / d, plate width is controlled to be 4000-4100mm, inner teeth are 3580-3860mm wide, and Vmain is 135-165m / h; and the prepared glass is good in transmittance, high in whiteness, small in colour difference, ultraviolet-resistant and non-glare. Optical distortion angle is more than 55 degrees, the produced glass plate is wide, and thickness and inner teeth are stable.

The invention discloses a lens module colour-difference correction method, a lens module colour-difference correction system, a lens module and photographing equipment. The lens module colour-difference correction method comprises the following steps: obtaining a current environmental colour temperature value at first; finding out a colour temperature parameter of the lens module under the environmental colour temperature value from a curve of a corresponding relationship between the colour temperature of the lens module and the colour temperature parameter; finding out a colour temperature parameter of a standard lens module under the environmental colour temperature value from a curve of a corresponding relationship between the colour temperature of the standard lens module and the colour temperature parameter; and calculating the relative difference value of the two, and correcting the colour difference of an image photographed by the lens module according to the relative difference value, such that the colour difference of the image photographed by the lens module under the environmental colour temperature value is close to or achieves the colour difference of an image photographed by the standard lens module under the environmental colour temperature value. According to the invention, the colour difference of the lens module can be dynamically corrected; the correction accuracy is high; and the effect is good.

The invention discloses a manufacture process for labels in dies, comprising the steps as follows: a) printing the justification sheets such as patterns of products, justification positioning hole and a unit positioning hole; b) punching corresponding justification positioning hole on the sheets; c) die-cutting the unit positioning hole and the label shape required to be formed by a die cutter; d) forming a label with a certain three-dimensional shapes on a forming die; e) processing the final product by the injection molding. The manufacture process of the invention has the beneficial effects of overcoming the defects in the prior art such as large consumption of leftover material, easily appeared pressing marks on the edges, rupture and colour difference appearing on the curved surface, low efficiency, and the like, changes the type of the prior art that a label is singly positioned, realizes the effects that a plurality of labels commonly use the positioning hole and a plurality of labels are formed once, improves the performance of the product and reduces the production cost.

The invention relates to a method for correcting colour of a colour difference meter by utilizing a tetrahedron interpolation method. Firstly, the traditional interpolation algorithm is used for measuring base colour points in required quantity, then a three-dimensional Delaunay triangulation algorithm is used for carrying out tetrahedron subdivision on base colours, and creating a lookup table by utilizing a tetrahedron set obtained by subdivision; after the lookup table is generated, supposing an input point to be P, after A is obtained, and further judging that which tetrahedron the input point P is located in A by utilizing a volume relation between the point p and each tetrahedron in A, wherein if more than two tetrahedrons are contained in B, the point p is a vertex of some tetrahedron, namely the point p is a point belonging to an interpolation point set, no interpolation is required, and a target RGB (red, green and blue) value can be directly output; and mapping of an imaging system is supposed to be in a linear relation, output standard colour value is pn=(Rn, Gn, Bn), and T can be shown by the following formula: pn-p=lambda*n*sigma. Compared with a common colour measuring method based on trichromatic analysis, the method provided by the invention has the characteristics of simplicity, speediness and accuracy.

An image forming apparatus includes an image forming device for forming a multi-color image using achromatic toner and chromatic toner; an image heating device for heating the multi-color image formed on a recording material; a setting device for setting a glossiness difference between an achromatic image portion and a color image portion; and a change device for changing an image heating condition of the image heating means in accordance with the set glossiness difference.

The invention discloses a brand-new method for designing a transmitted spectrum of a non-energy-consumption optical device. The method includes the following steps of firstly, selecting a light body; secondly, selecting color sense parameters including color gamut, color aberration, color migration, chromaticity and white point positions as the main parameter system to depict the human color vision perception for the target of vision optimization or control; thirdly, calculating and expressing various color sense parameters of human color vision perception by means of the color space; fourthly, optimizing and controlling the color sense parameters by means of an artificial intelligent linear or nonlinear mode; fifthly, selecting an optimal optimizing method to design the spectrum of the optical device through artificial intelligence; sixthly, conducting spectrum later-period processing; seventhly, conducting drawing and data displaying on the designed spectrum. The transmitted spectrum created through the design method directly simulates, optimizes and controls the improvement of the non-energy-consumption optical device on the human color vision perception.

The invention relates to a method and system for controlling color deviation of a film-coated printed matter. According the method and the system, a prefabricated printing color data set and a prefabricated film coating color data set are respectively used as a printing color management standard and a film coating color management standard respectively, and a target image is further matched with the standards respectively to realize the color deviation control of a target image film-coated sample. The control method and the system have the advantages that the color deviation identification isstandardized and digitalized, and the working efficiency is improved; the color accuracy of the target image film-coated sample is increased, and the number of the steps required to obtain the targetimage film-coated sample is effectively reduced; and the number of times of object printing is reduced, the consumption of printing materials is reduced, and the number of rejected products is effectively decreased.

The invention discloses a preparation method of dyeable polyester composite fiber of cationic dye. The preparation method comprises the following steps of: (1) preparation of modified polyester materials: including the preparation of core layer components and skin layer components; (2) preparation of polyester composite fiber: using the above method to prepare two types of dyeable modified polyester chips of cationic dyes, respectively carrying out crystallizing, drying, screw melting and extruding, metering, entering a skin-core eccentric composite spinning component according to the weight composite ratio of the skin layer and the core layer, completely wrapping the core layer by the skin layer, and preparing the three-dimensional curly dyeable polyester composite fiber of cationic dye by the follow-up technique. The invention has higher fiber initial modulus, can overcome the defects of lower fiber initial modulus of normal-pressure single component of the cationic dye, and form spiral three-dimensional curl after drawing and heat-setting, the curl number is higher than that of the fiber obtained by two-dimensional mechanical curl obviously; the cationic dye can carry out normal-pressure dyeing; and when being made into short fiber, the fiber section of the dyeable polyester composite fiber has no colour difference and is characterized by bright color and various styles.

In the present invention, colour difference signal (YCbCr) plane image data in 4:2:0 format can be picked up from paging storage and page containing Y data in the paging storage can be properly access-processed. Y data corresponding to M image element can be picked up and stored in displacement buffer storage, of which M value is bigger than or qual to 2. By utilizing abovesteps, Cb and Cr data can be access, picked up and stored so Y, Cb and Cr data stored in the displacement buffer storage can be treated to be plane vedio data set and Y, Cb and Cr data picked up from buffer storage is an image element data which is continuous and is used to put on video display unit.