57 results about "3D lookup table" patented technology

A color mapping process enhances a watermark by computing a change in colors that is less visible for a given watermark strength. The mapping process provides smooth transitions from one color region to another, and may be implemented efficiently with a 3D look up table. A user interface scheme enables the user to control encoding of the watermark in desired color regions.

The present invention relates to an imaging device and a method of processing an imaging result in an imaging device, and is applied to e.g. an electronic still camera to thereby allow the camera to correct image quality readily and flexibly with avoiding the deterioration of the image quality effectively. In the present invention, a three-dimensional look-up table is provided and an imaging result (Y2, Cb2, Cr2) is corrected by use of the three-dimensional look-up table.

A method of producing a color image comprising providing input image data from an image source such as a camera; generating an at least three-dimensional look-up table of values of input colors and output colors, wherein the values in the lookup table convert the input image color data to output image color data in an image rendering unit; loading the at least three-dimensional look-up table into an image color rendering controller; loading the input image data into the imaging color rendering controller; processing the input image data through the at least three-dimensional look-up table to produce output color values stored at the addresses in the at least three-dimensional look-up table; and outputting the output color values to the image rendering unit to produce an output image that is perceived to have at least one of enhanced brightness, enhanced contrast, or enhanced colorfulness compared to the input image.

The invention relates to the technical fields of digital images and three-dimensional data processing, particularly to a rapid three-dimensional measurement system and method for correcting nonlinear distortion through lookup tables. The method comprises establishing the three-dimensional measurement system; calibrating the three-dimensional measurement system; establishing lookup tables about grey level nonlinear distortion correction; generating structured light scanning images containing fundamental frequency and high frequency and pre-correcting the generated structured light scanning images through the lookup tables to obtain images for three-dimensional measurement; scanning an object to be measured and capturing image data containing object information synchronously; calculating the obtained scanning image data to generate three-dimensional point cloud coordinates for display. By establishing the lookup tables about the grey level nonlinear distortion correction through pre-calibration and performing grey level correction on the generated structured light scanning image data through the lookup tables, the rapid three-dimensional measurement system and method for correcting nonlinear distortion through the lookup tables can effectively overcome the influence of nonlinearity, namely, Gamma of a projector and meanwhile solve the problem of overflow and underflow of pixel value, which occurs during the measurement process.

The color of magenta using newly developed magenta ink has characteristics L*≅41, a*≅82, and b*≅24, and has differences ΔL*≅4, Δa*≅0, and Δb*≅26 from the conventional magenta ink, i.e., the lightness value is low, and the color difference b* assumes a very small value. When the color of red is reproduced using such new magenta ink, its lightness and saturation values are low, and subdued red is reproduced, i.e., a visually favorable color cannot be obtained. Hence, when a color included in a first color gamut is input, and the input color is converted into the color of a second color gamut narrower than the first color gamut, color conversion is made using a three-dimensional lookup table having red defined by. L*≅45 to 50, a*≅67 to 70, and b*≅50 to 55.

Disclosed is an apparatus for driving an LCD device displaying 2D image, and 3D image through the use of shutter glass comprising: a lookup table part including a 3D lookup table for generating 3D overdriving data to be reflected in 3D image data, and a 2D lookup table for generating 2D overdriving data to be reflected in 2D image data; a lookup table selecting part for selecting the 2D lookup table or 3D lookup table provided from the lookup table part according to 2D or 3D mode input; an ODC data generating part for generating the 2D overdriving data to be reflected in the 2D image, and the 3D overdriving data to be reflected in the 3D image according to 2D or 3D mode input; and a shutter glass controlling part for controlling an operation of shutter glass so that a user recognizes an image displayed on a liquid crystal panel as the 3D image.

A display device includes a luminance modulator and a color modulator which are formed of separate modulators. Herein, when, in order to reproduce an input signal, a luminance control signal of the luminance modulator and a color control signal of the color modulator are determined by the input signal, a three-dimensional look up table which is created on the basis of a measurement result relating to the color control signal corresponding to the predetermined luminance value is used, whereby the color control signal of the color modulator is determined by the input signal.

A system and method for tetrahedral interpolation computations using data-level parallelism that takes advantage of data-level parallelism in media processors. If the tetrahedron points in a 3D lookup table are packed together in a memory, the interpolation computation can be implemented without extra instructions to unpack them. An algebraic manipulation of the interpolation equation allows computing the difference on the fraction coefficients instead of the tetrahedron node values. Not only will this technique preserve the full precision without over or underflow, but the packed data from the 3D lookup can be used directly, thereby allowing a faster implementation of the color space transformation overall and implementing as part of a direct-copy image path on a media processor. Such a system and method allows the implementation of the direct copy pipeline to function at the required performance rate as requested by a customer specification while obtaining the required product design speed.

The present invention relates to an imaging device and a method of processing an imaging result in an imaging device, and is applied to e.g. an electronic still camera to thereby allow the camera to correct image quality readily and flexibly with avoiding the deterioration of the image quality effectively. In the present invention, a three-dimensional look-up table is provided and an imaging result (Y2, Cb2, Cr2) is corrected by use of the three-dimensional look-up table.

A method for correcting colors in an image commences by first defining a set of Red-Green-Blue (RGB) color triplets corresponding to user-selected colors defining a designated are of interest in the image to undergo color correction. The set of RGB color triplets are mapped into in a color space defined by cylindrical coordinates to create a three-dimensional look-up table (3D-LUT) that represents a first color range for the designated area of interest. The 3D-LUT undergoes adjustment to establish a second color range. Thereafter, the image is rendered using the 3D-LUT to replace colors in the designated area of interest with colors in the second color range.

An imaging system includes an array of photodetectors configured to produce an array of intensity values corresponding to light intensity at the photodetectors. The imaging system can include a display for display images acquired with the array of photodetectors, after some image and display processing. The image and display processing components of the imaging system produce an array of display-formatted pixels for display on the imaging system display. The display-formatted pixels include at least a first plurality of pixels formatted for display using a first lookup table and a second plurality of pixels formatted for display using a second lookup table. Threshold criteria for choosing which pixels belong to which plurality are determined from analysis of a scene indicated by a user as a background scene. Once the threshold criteria are determined from the background the criteria are applied to pixels in subsequent image frames, and the pixels that meet the criteria are displayed in at least one color table LUT and the pixels that do not are displayed in a at least one different color table LUT. In a particular embodiment. The criteria may be above or below the max scene value (or temperature) from the background scene and pixels below the criteria may be displayed in a monochrome or non-vivid color table and pixels above the criteria are displayed in a vivid color table.

The invention discloses a color gamut matching method comprising the following steps: obtaining to-be-matched image data from a signal source end; building a primary matching relation between the to-be-matched image data and to-be-outputted image data of a display end according to the color gamut data coordinates of the signal source end and color gamut data coordinates of the display end; obtaining to-be-outputted image primary data of the display end according to the primary matching relation; accurately matching the image primary data that is to-be-outputted on the display end according toa 3D search table, thus obtaining image accurate data to be displayed on the display end. The invention also discloses a device, a display terminal and a readable storage medium, thus solving the color gamut color distortion, and improving the display effect of the display device.

A method of producing a color image using a display comprised of pixels comprising red, green and blue primary color subpixels. The method comprises reducing the color gamut and increasing the brightness of the image relative to a base level, decreasing power to the display to reduce the brightness of the image, restoring color to the image to approximately the base level by modifying image pixel data using a three-dimensional lookup table to produce output image pixel data, and communicating the output image pixel data to the display. The display may be an LCD display, an LED display, an OLED display, a plasma display, and a DMD projector. Reducing the color gamut and increasing the brightness of the image may be accomplished by adding white to the image. The white may be added adaptively according to an algorithm by which the amount of white added decreases with increasing color saturation.

The invention belongs to the field of graphic information processing, and provides a decimal lookup table generation method for video stitching. The decimal lookup table generation method for video stitching comprises the steps of coordinate projection, feature point detection and matching, filtering of erroneous matching points and construction of a decimal lookup table. According to the decimal lookup table generation method for video stitching, first, coordinate projection is conducted, wherein images to be stitched are projected to a standard coordinate system; then, feature point detection and matching is conducted, and the erroneous matching points are filtered; finally, the decimal lookup table is constructed and clipped according to the size of a stitched video, and a stitched video image is obtained by means of the decimal lookup table through bilinear interpolation. According to the decimal lookup table generation method for video stitching, a one-to-one mapping relation between shot images and stitching image coordinates can be obtained to meet the requirement for instantaneity of video stitching; meanwhile, the decimal lookup table is more natural than an integer lookup table in transition, and therefore an ideal visual effect can be achieved.

An image processor is disclosed which is capable of automatically generating a series of test signals, running the test signals through its image processing software and hardware, and capturing the resulting output signals to automatically generate a 3D LUT that represents most or all of the imaging processing steps being performed by the image processor. No external equipment is required to generate the 3D LUT. In other embodiments, the image processor may be connected to an external image processing device, and the image processor can then automatically generate a series of test signals, run those test signals through the external image processing device, and capture the resulting output signals to automatically generate a 3D LUT that represents most of all of the image processing steps being performed by the external image processing device.

The invention discloses an apparatus and a method for driving a liquid crystal display device. The apparatus for driving the LCD device displaying 2D image, and 3D image through the use of shutter glass comprising: a lookup table part including a 3D lookup table for generating 3D overdriving data to be reflected in 3D image data, and a 2D lookup table for generating 2D overdriving data to be reflected in 2D image data; a lookup table selecting part for selecting the 2D lookup table or 3D lookup table provided from the lookup table part according to 2D or 3D mode input; an ODC data generating part for generating the 2D overdriving data to be reflected in the 2D image, and the 3D overdriving data to be reflected in the 3D image according to 2D or 3D mode input; and a shutter glass controlling part for controlling an operation of shutter glass so that a user recognizes an image displayed on a liquid crystal panel as the 3D image.

The embodiment of the invention discloses an image enhancement method, a model training method and equipment, which can be applied to the field of image processing in the field of artificial intelligence, and the method comprises the following steps: extracting features from an input image through a first neural network layer to obtain a first feature, performing pixel classification and image classification on the first feature through a second neural network layer and a third neural network layer to generate first classification information and second classification information, and obtaining a target lookup table based on the first classification information, the second classification information and a spatial perception three-dimensional lookup table (3D LUT); building the spatial perception three-dimensional lookup table according to each image category and each pixel category; and finally, obtaining an enhanced image according to the input image and the target lookup table. Compared with a traditional three-dimensional lookup table, the method has the advantages that the processing capacity is improved, and the problem that inaccurate results (such as local wrong colors and artifacts) are easily generated due to less information in an enhancement method based on the traditional three-dimensional lookup table is solved.

An image processor is disclosed which is capable of automatically generating a series of test signals, running the test signals through its image processing software and hardware, and capturing the resulting output signals to automatically generate a 3D LUT that represents most or all of the imaging processing steps being performed by the image processor. No external equipment is required to generate the 3D LUT. In other embodiments, the image processor may be connected to an external image processing device, and the image processor can then automatically generate a series of test signals, run those test signals through the external image processing device, and capture the resulting output signals to automatically generate a 3D LUT that represents most of all of the image processing steps being performed by the external image processing device.

A technique that can contribute to improvement of processing efficiency in performing image processing employing an SIMD command is provided.A color conversion apparatus that converts, on the basis of a three-dimensional look up table that stores color conversion values associated with respective plural lattice points dividing a first color space represented by three kinds of color components into plural cubic lattices, a color value of a point belonging to the first color space into a color value of a point belonging to a second color space. The color conversion apparatus is characterized by including a color-value acquiring unit that acquires a color value of a point belonging to the first color space as an object of color conversion, a lattice discriminating unit that discriminates, on the basis of the color value acquired by the color-value acquiring unit, a cubic lattice on the first color space to which the point as an object of color conversion belongs, a polyhedron discriminating unit that discriminates, by performing comparison of the color value acquired by the color-value acquiring unit and a color value of a lattice point included in the cubic lattice discriminated by the lattice discriminating unit, to which one of plural polyhedrons the point as an object of color conversion belongs, the polyhedrons being obtained by dividing the cubic lattice, which is discriminated by the lattice discriminating unit, with a plane having plural lattice points included in the cubic lattice as vertices, and an interpolation operation unit that interpolates, on the basis of color conversion values associated with lattice points forming the polyhedron discriminated by the polyhedron discriminating unit, a color value of a point belonging to the second color space that corresponds to the color value of the point belonging to the first color space.

The invention provides a 3D lookup table generation method and a display color correction method and system, and the method comprises the steps: driving a display screen to display a corresponding color according to a display instruction, and carrying out the sampling of the color actually displayed by the display screen until all the sampling is completed; Converting the sampled color values intoan LAB color space; Aiming at each RGB value in the 3D lookup table, selecting a sampling point corresponding to the RGB value; carrying out multivariate high-order linear regression equation calculation by using the color values of the selected sampling points converted into the LAB color space to obtain the values of coefficient variables of the multivariate high-order linear regression equation, the number of the selected sampling points being at least equal to the number of the coefficient variables of the multivariate high-order linear regression equation; And establishing a mapping relation between the RGB values and the output color values by using a multivariate high-order linear regression equation. The method is simple in algorithm, a user only needs one color analyzer to complete color correction except for a display, and a manufacturer only needs to add the algorithm into an original system to complete color correction.

Using a first lookup table used to convert color data on a device-independent color space into color data on a device-dependent color space, and a second lookup table used to convert the color data on the device-dependent color space into color material data corresponding to a plurality of color print materials, the image processing apparatus acquires output values using the first lookup table in accordance with input values the number of which is larger than the number of grid points of the first lookup table, acquires output values using the second lookup table, as input values, the output values acquired, and generates a third lookup table corresponding to the predetermined number of input values which is larger than the number of grid points of the first lookup table in accordance with the output values acquired.

In a color conversion method of inputting at least two color difference values and obtaining a corresponding saturation value, a main lookup table which stores the saturation value for the color difference values, and a sub-lookup table for obtaining an address for accessing the main lookup table, are created. An address to be used in accessing the main lookup table is determined on the basis of the sub-lookup table and the difference between the two color difference values, in correspondence with two arbitrary color difference values. A saturation value corresponding to the two color difference values is obtained from the determined address of the main lookup table.

A system is provided for converting image data from a first image format to a second image format that approximates a three-dimensional lookup table. The system includes an image processing operation database that stores image format conversion configurations; an image format conversion selector that selects an image format conversion for converting the image data from a first to a second format and that accesses, from the database, a corresponding image format conversion configuration for converting the image data to the second format; and an image processor that executes processing input operations on RGB components of the image data, a 3×3 matrix, and processing output operations on the respective RGB components that are output from the 3×3 matrix, such that the image data is converted to the second format, with the processing input and output operations comprising the accessed image format conversion configuration.

An embodiment of the invention provides a method and a device for adjusting picture colors of electronic equipment. The method is applied to the electronic equipment; the electronic equipment comprises a display screen and a processor; the processor comprises a display processing unit (DPU); and the DPU acquires a to-be-displayed picture, acquires a target 3D lookup table used for adjusting the to-be-displayed picture according to the first color mode, maps colors of the to-be-displayed picture according to the target 3D lookup table to obtain an adjusted picture, and sends the adjusted picture to a display screen for display by the DPU. According to the method, the existing color mapping hardware in the DPU is reused for adjusting the colors of the picture, so that the problems of performance and power consumption when an existing software mode is used for adjusting the color of the video are solved, the color of the high-resolution long video can be adjusted in real time, and the power consumption of the electronic equipment is not increased.

Provided is a printing system comprising a printing mechanism for applying ink to a substrate using a plurality of print colors. Also included is a computer readable media storing an image and instructions for generating entries in a variable resolution lookup table for use in performing accelerated color conversion of the image. Also included is a lookup table generator configured to divide the lookup table into a plurality of areas, and set a density of lookup table entries in each of the plurality of areas based on overprint combinations of the print colors. The density of entries is varied from one area to another. Also included is a color conversion controller configured to utilize a lookup function to retrieve one or more lookup table entries and to provide printing color space coordinates based upon the one or more lookup table entries to the printing mechanism.

The invention discloses a three-dimensional lookup table-based image color correction method. The method comprises the steps that: S1, an image is collected, and an RGB domain image is generated; S2,a first-level lookup table is established by utilizing a standard color card image and a test color card image, and a first-level interpolation color card image is generated; S3, interpolation is performed on the image obtained in the step S1 by using the first-level lookup table to obtain a first-level interpolation image; S4, weighted fusion is performed on the first-level interpolation image and the image obtained in the step S1 to obtain a first-level color correction result, and weighted fusion is performed on the first-level interpolation color card image and the test color card image toobtain a first-level color card correction result; S5, a multi-stage lookup table is established according to the previous-level lookup table, a test color card, a previous-level interpolation colorcard image or a previous-level color card correction result, and the standard color card image; S6, interpolation is performed with the multi-stage lookup table and a previous-level color correction result to obtain a current-level interpolation result; and S7, weighted fusion is performed on the current-level interpolation result and the previous-level color correction result.

An image processing method and an image processing apparatus converts a binary image into a grayscale image by increasing the size and information quantity of the binary image. The image processing method includes generating a plurality of lookup tables having multiple gray level values assigned to a predetermined pattern of the binary image such that the gray level is retrieved from the plurality of lookup tables depending on the context of the block being processed. The binary image may be converted into the grayscale image by applying the gray value of one of the plurality of lookup tables that corresponds to the context, such as the frequency components of the binary image. With this configuration, since the size and information quantity of an image can be reduced for transmission, it is possible to prevent deterioration of image quality when the image is restored, while also printing at a higher speed.

The invention provides a color correction method and an image processing device which are used for generating a corrected image according to an original image. The original image includes a plurality of pixels and each pixel includes at least one color value. The method comprises the steps of converting the color values into a plurality of function color values according to a correction function and converting the color values into a plurality of lookup table color values according to a lookup table. The method further comprises the steps of synthesizing the function color values and the lookup table color values into a plurality of correction color values and generating the corrected image according to the correction color values. Therefore, a memory space required for storing the lookup table can be reduced.

In printing using a plurality of chromatic color inks of different lightness interchangeable with one another in color reproduction, ink consumption is reduced while preserving the quality of the printed result. On the basis of first color data represented in terms of density of a first reference color, second color data represented in terms of density of a plurality of second reference colors is generated. The plurality of second reference colors are the ink colors. They include two same hue reference colors of different lightness interchangeable with one another when reproducing a certain color. The lookup table holds the first color data and the second color data associated with one another. For a set of densities of a plurality of second reference colors representing achromatic color of higher lightness than the reference lightness, density of the same hue reference color having lower lightness is 0. The reference lightness is lightness equal to or less than the minimum lightness which is the lightness of the color having the lowest lightness among the colors that can be reproduced on a printing medium using only ink of the darker color of the two same hue reference colors.

The embodiment of the invention provides a color correction method, an AP chip, a terminal and a storage medium, relates to the technical field of display, and can improve the color consistency of a display picture. The color correction method is executed by the terminal and comprises the steps of obtaining to-be-displayed data and a first 3D-LUT, wherein the first 3D-LUT reflects the mapping relation between the display color of a display screen of the terminal and the target display color; acquiring first corrected data to be displayed according to the data to be displayed and the first 3D-LUT; and indicating to display according to the first corrected to-be-displayed data. The technical scheme is mainly used for color correction of the display panel.