Abstract: A method for setting a color conversion condition for use in an image forming device. The image forming device includes: a first color conversion unit that converts input image data into first output image data by using a first three-dimensional LUT; and second-first, second-second and second-third color conversion units for sequentially converting the input image data into intermediate image data ? and ? by using at least one LUT. The method includes: setting, in a form of values expressing a color conversion relationship on a second three-dimensional LUT, a relationship between the intermediate image data ? and the intermediate image data ? to ensure that first colorimetric data of an image formed on the basis of the first output image data is equal to third colorimetric data of an image that is formed on the basis of image data obtained by sequentially converting the same input image data.

Abstract: Provided are method and apparatus of pre-processing in WDR (wide dynamic range) image processing, the method of pre-processing of WDR image processing including: (a) receiving luminance and chrominance signals having different exposure times, and analyzing the correlation between a luminance signal having a first exposure time and a luminance signal having a second exposure time that is longer than the first exposure time; (b) based on the result of the analysis, dividing each of the luminance signal having the first exposure time and the luminance signal having the second exposure signal, into at least one of a bright region, a transition region, and a dark region; and (c) normalizing the regions of the luminance signal having the first exposure time to respectively correspond to the regions of the luminance signal having the second exposure times.

Abstract: Each of a plurality of polyhedron spaces is defined by a plurality of first vertices. Each of the plurality of first vertices is defined by a plurality of sets of third color data that are defined in the second color space. A color data setting unit sets a plurality of sets of fourth color data that are defined in a first color space in one to one correspondence with the plurality of third color data sets. A second dividing unit divides each of a plurality of polyhedron spaces into a plurality of smaller polyhedron spaces by a division number set for the each polyhedron spaces. Each of the plurality of smaller polyhedron spaces is defined by a plurality of second vertices and the plurality of first vertices. Each of the plurality of second vertices is defined by a plurality of sets of fifth color data defined in the second color space.

Abstract: A method for processing an image of a given file type is disclosed. The method involves converting the image into data formatted for a new pixel type, the new pixel type is closely correlated with and has all the components of pixels for the given file type. In addition, the method includes processing the data formatted in the new pixel type using standard image processing routines, these standard routines being designed for data having different components of pixels than the new pixel type and the given file type.

Abstract: Input data in a color space dependent on input device is converted into first data in a device-independent color space based on input viewing condition. Through forward conversion based on a perception model corresponding to the input viewing condition, the first data is converted into second data in a color perception space in accordance with specified color-space compression mode. The second data is converted into third data through color-space compression based on a gamut of first output device. The third data is converted into fourth data through color-space compression based on a gamut of second output device. Through inverse conversion based on a perception model of the second output device, the fourth data is converted into fifth data in a device-independent color space based on viewing condition of the second output device. The fifth data is converted into output data in a color space dependent on the second output device.

Abstract: In an illumination system (10), comprising: a lamp assembly (14) with a plurality of lamps (12A, 12B, 12C) and associated lamp drivers (13A, 13B, 13C); a common controller (15) for generating control signals (?1, ?2, ?3) for the lamp drivers (13A, 13B, 13C); a memory (18) containing a color table with color points; the color points of the color table are located in a two-dimensional plane corresponding to a ceiling of a color space. Perimeter color points (PC) are located on the borderline of said plane, in groups of equidistant color points, as measured in a perceptual uniform second color space. Equidistant spoke color points (SC) are located on constant hue lines (42) in said plane, constant hue line connecting one of said perimeter color points (PC) to a white point (W).

Abstract: A color processing apparatus for evaluating the gradation characteristic of a color conversion table that is used to convert signal values in input color space into signal values in output color space and has a plurality of grid points includes an acquisition unit configured to acquire signal values in the output color space corresponding to four adjacent grid points in the input color space through the color conversion table, a calculation unit configured to calculate a property of a tetrahedron formed by the signal values in the output color space, and an evaluation unit configured to evaluate a gradation characteristic of the color conversion table based on the property of the tetrahedron. The property of the tetrahedron may be the volume of the tetrahedron or the surface area of the tetrahedron.

Abstract: The invention relates to a method and a system for translating a three value color space signal, preferably given in a CIE scale, to an n primary color space signal, where n is an integer greater than or equal to 4, thus providing color controlling of a white light source comprising an array of colored light emitting diodes with respect to maximum CRI and maximum luminous efficiency.

Abstract: Methods and systems are presented for characterizing a color rendering system or a color marking material design process, in which forward color transform parameters are generated for mapping color from a first color space associated with an internal color representation of the color rendering system or marking material design process into a second color space using a least squares minimization of an error metric weighted according to a Taylor series expansion of the error metric.

Abstract: A method and system convert an original digital image being represented by a first color space to a digital image being represented by a second color space by transforming the original image data represented by a first color space to second image data being represented by a second color space, the transformation causing the colors of the transformed image data to be substantially encodable in the second color space. The second image data represented by the second color space is transformed to third image data represented by the first color space, the transformation causing the colors of the transformed image data to be substantially encodable in the first color space. Distortions in the third image data represented by the first color space are corrected to form corrected image data represented by the first color space, and the corrected image data represented by the first color space is transformed to fourth image data represented by the second color space.

Abstract: An imaging apparatus include an imaging unit configured to capture an object image, a smoothing unit configured to smooth a dynamic range of luminance of an image signal generated based on the object image captured by the imaging unit, and a color conversion unit configured to perform a color conversion with respect to a color of the image signal whose dynamic range is smoothed by the smoothing unit and is specified by a user.

Abstract: A system and method that detects when pixels from one color space would exceed the range of a second color space, and restrict the range of the pixels without distorting their brightness, while preserving their color. The method may provide the ability to restrict the range of pixels in the first color space that may ordinarily transform to “illegal” values with erroneous brightness in the second color space, to a sub-space containing the entire second color space, while preserving the brightness of the pixels. The parameters used to define the sub-space may be programmable. The first color space may be YCrCb and the second color space may be RGB.

Abstract: An image forming system includes: a resource information storage unit that previously stores resource information to be combined with input print information; a first setting unit that sets an image characteristic of the resource information stored in the resource information storage unit; a second setting unit that sets an image characteristic of the input print information; and a color conversion unit that, when the image characteristic set by the first setting unit and the image characteristic set by the second setting unit are different, performs color conversion on the resource information based on the image characteristic set by the first setting unit, and performs color conversion on the print information based on the image characteristic set by the second setting unit.

Abstract: When each value of luminance signals of three primary colors in the primary video signal is less than the output lower limit value, in short, when the gradation level is negative, the negative gradation level of the present primary color is, in accordance with its magnitude, in other words, in accordance with the absolute value of the negative gradation level, replaced with positive gradation levels of other two primary colors. Therefore, in accordance with A VIDEO SIGNAL CONVERTER of this invention, even when the primary video signal includes a signal value having a negative gradation level, in short, even when one or more of each signal value of RGB is below the output lower limit value, a color according to the combination of those gradation levels (a combination of each level of primary colors (RGB)) can be reproduced (displayed) by a display means.

Abstract: A terminal device having a correction function for natural color and a method thereof are provided for creating an image closest in color to the natural color. A priority storing unit stores at a reference color data area a range of natural colors which are colors of objects existing in the natural world. A color editing unit corrects natural color image data corresponding to the natural color area, based on a command for correcting the natural area existing in a predetermined image from the user. A controlling unit decides whether the natural color image data corrected by the color editing unit is included in the reference color data area.

Abstract: Methods, apparatuses, systems, and machine readable media for pixel transformations. One exemplary method includes: determining a state of a pixel format transformation, wherein a pixel format includes a predetermined number of pixel data components and a predetermined number of bits for each of the pixel data components and wherein the state includes a source pixel format and a destination pixel format and at least one intermediate pixel format; converting pixel data in the source pixel format to pixel data in the intermediate pixel format; and converting the pixel data in the intermediate pixel format to pixel data in the destination pixel format. In certain embodiments, a method includes building and compiling a function, at run-time, for the pixel format transformation based upon the state.

Abstract: A method to perform compositing of three-dimensional images includes, on a Central Processing Unit (CPU), automatically assembling a Graphics Processing Unit (GPU) program for each element of a plurality of image elements. The GPU program for each element is to apply at least one effect to the respective image element. The plurality of image elements, and the associated GPU programs, is communicated from the CPU to a GPU.

Abstract: A method of retaining original natural language commands along with the mathematical LUT transform of the commands and a private tag within the same ICC profile. The private tag can be read only by an exclusive or proprietary application or color management module. When a user loads a color editing profile into the proprietary application, the natural language commands could then be read from the private tag and displayed on a user interface. The user can then immediately see the qualitative effect of the color editing profile and provide selected modifications to the commands and retain a new set of commands stored in another profile.

Abstract: An image displaying device and a method for controlling color thereof. The image displaying device includes a lattice selection unit which selects a lattice of a look-up table (LUT) for reference of each pixel of an input image, a lattice control unit which determines whether the selected lattice requires to be changed for color adjustment and calculates a change degree of the lattice, an LUT conversion unit which converts the LUT by changing the lattice based on the calculated change degree, and a lattice reference/interpolation unit which refers to or interpolates the lattice based on the converted LUT. Accordingly, the LUT can be updated real time, thereby realizing more accurate adjustment of color.

Abstract: A Personal Computer (PC) adjusts a color of an image received from a digital camera to produce an estimated reflectance spectrum and/or to convert the color to a new color space. First, an input compensation transform is generated, e.g. based on a Macbeth color chart in the image, to compensate for the sensitivity of the camera used to generate the image to different wavelengths of light and the illumination spectrum incident on an object of interest to which the image relates. In order to estimate the reflectance spectrum, a reflectance spectrum estimation transform is then generated by the PC. In order to convert the color of the image to the new color space, a color space conversion transform is generated by the PC. Both the reflectance spectrum estimation transform and the color space conversion transform are based on the input compensation transform and reference reflectance spectra stored in a reference reflectance spectra database.

Abstract: The present invention provides an image processing device, a color correction table generation device, a display device, an image processing method, a color correction table generation method, a color adjustment method of a display device, and an image processing program capable of color matching to preferred colors of which excessive emphasis in chroma is suppressed. There are provided a chroma limit setting section for setting a chroma limit based on a optimal color, and a color correction table generation section for generating a color correction table by making a correspondence between an input color and an output color having chroma no greater than a chroma limit. The color correction table is stored in a color correction table storage section. The color correction execution section executes color correction along the color correction table so that the projector outputs a color with chroma no greater than the chroma limit.

Abstract: In creating a color conversion table, search time for searching a point at which a color difference with a target color corresponding to a grid point is minimum can be reduced effectively. In a predetermined grid point constituting a second pre-color processing table, a post-RGB value of a target color of the grid point is determined by interpolation computation using a first pre-color processing table created beforehand. An interpolation operation using each grid point data of a plurality of grid points in the neighborhood in the table is executed, thus the post-RGB value of an object grid point is determined. Next, a neighboring region of the obtained post-RGB value is set, and a post-RGB value of most approximate to the target color in the neighboring region is determined as grid point data of the object grid point.

Abstract: A system and method of converting a red-green-blue (RGB) pixel to a red-green-blue-white (RGBW) pixel by using a W value extraction, the RGB-to-RGBW converting system including: a lookup table generator to generate an RGBW lookup table using one or more RGB lattice points; and an RGBW value computation unit to compute an RGBW value of an input pixel with respect to an RGB value of the input pixel based on the generated RGBW lookup table.

Abstract: Tuning sizes of cells of an interpolated lookup table may be performed based at least in part on an area specific behavior of a quality metric. A weighted input shaper curve may be determined to reduce interpolation errors in a multi-dimensional color lookup table. An initial input shaper curve may be applied to a color lookup table to create an interpolation result. The interpolation result may then be assessed for accuracy. The accuracy assessment may include comparing the interpolation result with a reference representation. An interpolation error may be calculated as the error between one or more intervals in a prospective color lookup table as compared to a reference representation. The weighted input shaper curve may be based at least in part on the calculated interpolation error.

Abstract: A method processes image data in a color separation to attenuate printing defects arising from misalignment of serially arranged printheads that eject ink for the color separation. The method includes processing image values of the color separation with a first rendering process that corresponds to one printhead in a plurality of serially arranged printheads for printing the color separation, processing the image values of the color separation with a second rendering process that differs from the first rendering process for at least one other printhead in the plurality of serially arranged printheads for printing the color separation, generating firing signals for the one printhead from the rendered image values generated by the first rendering process, and generating firing signals for the at least one other printhead from the rendered image values generated by the second rendering process.

Abstract: In an image processing apparatus, a first conversion unit converts, on the basis of an input device profile, input data into first device-independent data expressed by a color space that is independent of an apparatus. A storage unit stores plural conversion profiles for converting using a color appearance model in the color space that is independent of the apparatus in correspondence with plural device characteristics that are dependent on apparatuses. A selection unit selects a conversion profile corresponding to characteristics of the input device, characteristics of an output device, observation conditions of the input data and the output data. A second conversion unit converts, on basis of the selected conversion profile, the first device-independent data into second device-independent data. A third conversion unit converts the second device-independent data into the output data on the basis of an output device profile.

Abstract: Completely automated end-to-end method and system for markerless motion capture performs segmentation of articulating objects in Laplacian Eigenspace and is applicable to handling of the poses of some complexity. 3D voxel representation of acquired images are mapped to a higher dimensional space (k), where k depends on the number of articulated chains of the subject body, so as to extract the 1-D representations of the articulating chains. A bottom-up approach is suggested in order to build a parametric (spline-based) representation of a general articulated body in the high dimensional space followed by a top-down probabilistic approach that registers the segments to an average human body model. The parameters of the model are further optimized using the segmented and registered voxels.

Abstract: A computer system (810) receives a desired upper bound ?Smax for a relative quantization step ?S??S??/?S?? to be used when quantizing any color in some range of colors. Here S? and S? are adjacent colors in the set of colors to be made available for the quantized image, and ?·? is a norm in a 70%-orthonormal linear color coordinate system, the norm being the square root of the sum of squares of the tristimulus values. The computer system determines (510) suitable quantization steps for the brightness coordinate (B) and the chromatic coordinates (e,ƒ) in anon-linear color coordinate system, and quantizes (520) the brightness and chromatic coordinates accordingly.

Abstract: Techniques for modifying aspects of the gamut mapping function in a multi-primary display system influence the performance of the display or the perception of certain ones of the colors. One embodiment of the system comprises a method for selecting a metamer. Other embodiments provide methods for modifying the output color produced by the gamut mapping operation for input colors that are on the darker or brighter surfaces of the input color gamut, or for certain out-of-gamut colors such as yellow colors.

Abstract: A method includes identifying multiple preferred color values in a destination color space. Each preferred color value is one of a set of colorimetrically equivalent color values. The destination color space has color values defined by a particular number of color components. The method further includes defining intermediate color values in an intermediate color space. The intermediate color values correspond to the multiple color values and the intermediate color space has a number of color components that is less than the particular number of color components of the destination color space. The method also includes identifying a known mapping from the destination color space to a source color space and using the intermediate color values and the known mapping to determine a conversion process for converting source color values to preferred color values.

Abstract: A color conversion device that color-converts colors of input image data into colors used in a display unit for displaying images using at least white includes: a ratio calculating unit that calculates a lightness ratio and a saturation ratio between a color reproduction range in the standard color space and a color reproduction range in colors used by the display unit in L*a*b* space at least when a color outside of the color reproduction range in colors used by the display unit is calculated; and a color compressing unit that performs color compression on the image data based on the ratios calculated by the ratio calculating unit.

Abstract: A graphics system including a custom graphics and audio processor produces exciting 2D and 3D graphics and surround sound. The system includes a graphics and audio processor including a 3D graphics pipeline and an audio digital signal processor. The graphics system has a graphics processor includes an embedded frame buffer for storing frame data prior to sending the frame data to an external location, such as main memory. The embedded frame buffer is selectively configurable to store the following pixel formats: point sampled RGB color and depth, super-sampled RGB color and depth, and YUV (luma/chroma). Graphics commands are provided which enable the programmer to configure the embedded frame buffer for any of the pixel formats on a frame-by-frame basis.

Abstract: Determination of a grid structure for a set of values in a device color space, in which heuristics are applied to a collection of color sample data in order to determine the structure of a look-up table that best fits the samples. Sampling data is sorted for each channel thereof, and the number of steps in each channel is counted. The data is checked for completeness. Steps are removed if they do not correspond to steps on the axes of a three-dimensional cube. If, as a result of step removal, a full LUT has been obtained, then the structure of the LUT has been determined and the process ends. On the other hand, if a full LUT has not been obtained, then steps are removed if they are under-correlated with other steps.

Abstract: Techniques for low cost gamma mapping convert three-primary input image data, such as RGB data, into a four primary color display color space, such as an RGBW color space, for rendering on the display by calculating a value for W image data based upon the RGB image input data; deriving an allowable value for W based upon a chromaticity specification of the display, and calculating output values for R, G and B image data based upon the allowable W value. A display system receiving input image data specified in three input primary colors includes modules for converting the input image data into image data specifying color values in four display primary colors. A first module determines a value of a first display primary color, and a second module determines the value of second, third and fourth display primary colors by computing a solution set to simultaneous equations based upon the value of the first display primary color.

Abstract: A color signal conversion apparatus for converting a color signal of an input gamut to a color signal of an output gamut is provided. First, a target gamut for gamut mapping carried out on the input gamut is set, after which an evaluation function is determined for evaluating the difference between the target gamut and the results of gamut mapping performed on the input gamut using initialized mapping parameters. Then, the mapping parameters are determined based on the evaluation function so that the difference is minimum. The color signal of the input gamut is then mapped to the output gamut based on the determined mapping parameters and constraining conditions. This makes it possible to achieve favorable gamut mapping based on optimal mapping parameters that have been determined automatically.

Abstract: The described embodiments provide a system that facilitates a switch from using a first graphics-processing unit (GPU) to using a second GPU to drive a display. During operation, upon generation of a request to switch from using the first GPU to using the second GPU as a signal source for driving the display, the system obtains a transform (such as a lookup table) that enables the displayed color output from the second GPU to substantially match the displayed color output from the first GPU. The system then makes the transform available for use by the second GPU in driving the display.

Abstract: An apparatus and method for converting color data from one color space to another color space. A driver determines that a set of shader program instructions perform a color conversion function and the set of shader program instructions are replaced with either a single shader program instruction or a flag is set within an existing shader program instruction to specify that output color data is represented in a nonlinear color format. The output color data is converted to the nonlinear color format prior to being stored in a frame buffer. Nonlinear color data read from the frame buffer is converted to a linear color format prior to shading, blending, or raster operations.

Abstract: A method and apparatus for performing color plane adjustment are provided. In one embodiment, an apparatus comprises a set of inputs for receiving a first input value and a second input value in a color space. The apparatus also comprises a color plane adjustment component operative to adjust the first input value and the second input value by amounts that depend on a distance of the first input value and second input value, respectively, from a value of neutral gray in the color space. The apparatus further comprises a set of outputs for outputting the adjusted first and second values. A related method and computer program are disclosed. Other embodiments are disclosed, and each of the embodiments can be used alone or together in combination.

Abstract: A method, system, and computer-readable storage medium are disclosed for color conversion of a digital image. The digital image comprises a source set of pixels. A perceptual distance may be determined between the source set of pixels and a respective destination set of pixels for each of a plurality of rendering intents. A rendering intent corresponding to the smallest perceptual distance may be selected automatically. The source set of pixels may be converted to an output set of pixels using the selected rendering intent.

Abstract: Elements of the present invention relate to systems and methods for determining device white point and gamma correction curve characteristics.

Abstract: A system for processing image files includes a palette module, an image file disposal module, and an image file rebuild module. The palette module defines a plurality of colors. The image file disposal module processes a RGB image, and acquiring RGB values of all pixels of the RGB image. The image file rebuild module converts the RGB image to a new image displayed by the plurality of colors defined by the palette module.

Abstract: In a method of managing color output by appearance intent a color display value is received. The color display value comprises at least one appearance intent tag and is associated with an item of graphic content. The color display value is converted into an intermediate color value such that an appearance intent specified by the appearance intent tag is preserved in the intermediate color value. The intermediate color value is converted into an output color display value recognizable by an output device, such that the appearance intent is preserved in the output color display value.

Abstract: A method and apparatus for rendering image data on a 3D display is disclosed. A first image signal is received and then at least one colour component of the first image signal is rendered in reduced spatial resolution to produce a second image signal. The second image signal is spatial filtered wherein spatial errors and view errors are balanced when reconstructing a full resolution signal for the display.

Abstract: A method of converting a three primary color input signal into a four primary color drive signal, includes defining three functions representing the first, second, and third drive signals as a function of the fourth drive signal, determining the intersection values of the fourth drive signal at a set of intersections of the three functions mutually, and of the three functions and a line defined by the fourth drive signal being equal to itself, determining boundary values of a valid range of the fourth drive signal in which all drive signals have valid values, determining calculated values of the first, second and third drive signals at the intersection values and the boundary values, calculating the maximum value (Vmax) or minimum value (Vmin) of the calculated values at the intersection, and selecting the intersection value at which the maximum value or minimum value is minimum or maximum, respectively.

Abstract: An improved gamut map model (GMM) useful in conjunction with Windows Color System (WCS). The method uses the WCS Minimum Color Difference (MinCD) GMM to handle gamut mapping for the Saturation rendering intent at low input chroma values. For input values to the gamut map model profile (GMMP), if the chroma value C falls within a predetermined chroma value range, the MinCD GMM will be applied, otherwise the Hue Mapping GMM is applied. The predetermined chroma value range can be determined by experimentation. The range is 0?C?10 in a preferred embodiment. This method will improve the gradation fidelity of the rendered images and reduce or prevent major hue shifts at low chroma values. The method may be implemented as a plug-in utility for a computer.

Abstract: A system is configured to calculate an evaluation index of sample ink amount data from a color difference evaluation index and an image quality evaluation index and create a profile on the basis of a sample with a high rating value. When the image quality evaluation index is predicted, the image quality evaluation index corresponding to any sample ink amount data is estimated based on a profile produced on the basis on actual evaluation. A printer driver is configured to create a plurality of profiles by using different indices in this system and to perform color conversion by using the plurality of profiles. The plurality of profiles are appropriately selected according to the user's needs, printing conditions, and type of printing object image.

Abstract: The management of color presented at end point devices such as a display or printer is based on the implementation of a Color Management Resource (herein also CMR). A CMR is an architected resource stored accessibly to a print server or other processor that is used to carry all of the color management information required to render a print file, document, page, or data object. The invention here described is particularly focused on a color conversion type of CMR and defines a new type here called a Link Color Conversion CMR. In particular, a unique descriptor is tied to each input and output color conversion rule. A linked color conversion rule, created by combining the input and output color conversion, is created. The linked color conversion structure contains three parts—the descriptor of the input color conversion rule, the descriptor of the output color conversion rule, and the combined color conversion rule.

Abstract: Generation of an Interim Connection Space (ICS) of a full spectral space is provided. A space of illuminants is accessed, and the full spectral space is decomposed into a first subspace that is an orthogonal complement of a metameric black subspace for the space of illuminants. The Interim Connection Space is generated based on the first subspace. The generated ICS can be used, for example, for rendering an image on an additive color destination device. One image rendering workflow includes accessing color data of the image in an ICS, transforming the color data from the ICS into a device dependent color space of an additive color destination device, and rendering the transformed color data on the destination device.

Abstract: An image-forming method includes inputting a color image, transforming the color image into a first grayscale image, reducing a first brightness range of the first grayscale image to a second brightness range, generating a grayscale gradient image corresponding to spatial distribution of the first grayscale image according to the first brightness range and the second brightness range, overlapping the first grayscale image having the second brightness range and the grayscale gradient image to generate a second grayscale image, generating a translation image according to the second grayscale image and the color image, and forming a three-dimension image according to the color image and the translation image.

Abstract: A process and system for depicting a combination of process colors and spot colors on a radiant light source such as a computer monitor screen. The invention provides a user-definable “meta-ink” color which is made up of the components of the process colors and the spot colors. Shade values are assigned to each of these components to create the meta-ink color. This meta-ink color then replaces the document color for visual depiction on the radiant light source. This process and system provides a more accurate depiction of the representation of the printed image.