107 results about "Colour look-up table" patented technology

A method of simultaneously transmitting a video signal and encoded data representing graphic images is disclosed. The invention is particularly applicable for transmitting multilingual subtitles with a video program. The graphic images are rectangular regions within the active video area. They are transmitted in the form of bitmaps. The invention not only allows any character font or size to be displayed, but also the definition of e.g. a program provider's logo. The encoded data includes a time stamp to specify the time at which a subtitle is to be displayed. Preferred embodiments of the invention include the transmission of color-look-up-table (CLUT) data and a compatibility code indicating a required minimum number of entries of said color-look-up-table. For receivers with a CLUT having more entries than necessary, a map table is a for mapping the pixel data width to the input witdh of the relevant CLUT. The method is applicable to Direct Video Broadcast systems wherein the video signal is MPEG2 encoded and the graphic images are accommodated in a private data stream of an MPEG2 Transport Stream.

Displaying colors in a color selection interface is disclosed. Displaying includes identifying a first plurality of colors associated with a color selection interface, mapping each color in the first plurality of colors to an allowed color in an allowed color set of one or more colors to obtain a second plurality of colors, wherein mapping is performed based at least in part on a color lookup table, and visually displaying the second plurality of colors in the color selection interface, wherein the color selection interface is configured to receive a color selection from the second plurality of colors.

Disclosed embodiments relate to techniques for color gamut mapping when an input signal transmitting color visual images has a different color gamut than does the output display device. Polynomial rubber-sheet mapping may be used to translate the input color gamut to the output color gamut on a hue-by-hue basis within a three-dimensional perceptual color space. Also, a memory color look-up table may be used to preserve memory colors in the input gamut which are capable of reproduction within the output gamut. By using such techniques alone or in combination, it may be possible to more effectively map an input color gamut to a different output color gamut with improved calorimetric accuracy.

Methods, systems, and apparatus for mapping a nonspectral representation of a target color, such as an input color tuple, to a set of concentration values for a set of device-specific colorants. The invention includes using the input color tuple to derive a first set of colorant concentration values from a color lookup table; and refining the first set of colorant concentration values by an iterative non-linear process to generate a final set of colorant concentration values. The first set of colorant concentration values can derived by using an input color tuple as an index to obtain grid-point concentration values at two grid points of the color lookup table and calculating the first set of colorant concentration values as a linear interpolation of the grid-point concentration values. In an implementation that provides a color function table of color-additive function values, the iterative non-linear process can include iteratively (a) calculating an interim color tuple from an interim set of colorant concentration values and the color function table, the initial interim set of colorant concentration values being the first set of colorant concentration values, and (b) deriving an interim set of colorant concentration values from a difference between the input color tuple and the interim color tuple. The calculations can include calculating a partial derivative of an error function from the difference between the input color tuple and the interim color tuple; and using the partial derivative to derive a successor interim set of colorant concentration values from a current interim set of colorant concentration values.

The invention provides a method for generating a laser color cloud picture, which is to set a plurality of target points in a scene to be detected. The method comprises the following steps: S10, rigidly binding a line camera and a laser scanner in parallel to ensure that two scanning surfaces of the line camera and the laser scanner are parallel, and the scanning surfaces are vertical to a line between the front node of the camera and the center of the laser scanner; S20, leading the line camera and the laser scanner to scan synchronously; S30, establishing a corresponding relationship between a scanning angle of the corresponding target point and pixel sequence number on a line image, i.e. a color searching list; and S40, establishing a relationship between each laser point in laser dot cloud and RGB information thereof according to the color searching list and the scanning time difference between the laser scanner and the line camera. The method ensures that fusion of the dot cloud and the image is changed from three-dimensional fusion in the prior art to polar coordinate one-dimensional fusion so as to reduce operation capacity, greatly improve the modeling accuracy, and achieve multiple functions. The method can greatly reduce time cost and economic cost of urban three-dimensional modeling.

A display device may include a respective backlight controller for each color in a color model. A screen driver for the display device may produce a histogram of brightness values for each color in the pixel data for an image frame, and may reduce the brightness of backlighting elements of the display device for individual colors when the histogram data indicates that maximum brightness is not required. For example, based on a backlight control value or signal sent to the corresponding backlight controller, the intensity of backlighting elements for one color may be turned down, or even off, for a particular image frame while the backlighting elements for other colors remain fully powered. The screen driver may make an adjustment to the pixel data to compensate for the dimming of the backlighting elements by modifying the color values in a color lookup table.

The invention provides a color calibration optimization algorithm based on a projector-camera system, which is used for eliminating influence on immersion and reality sense of an observer caused by color difference of a display system of a large multi-projection screen. In the invention, for the problem of neglecting influence of a camera in the previous algorithm, a high dynamic range image (HDRI) synthesis algorithm based on Pedro image segmentation is proposed so as to establish a mapping relation between an input pixel and an output pixel of the camera; brightness and chrominance of a projector are calibrated at the same time by virtue of a combined function approximation method for a YUV (luminance and chrominance) color space transformation model so as to generate a color lookup table (CLUT); graphic processing unit (GPU) rendering for color calibration is realized based on shading language; and finally the three-channel annular multi-projection screen is taken as an experimental platform to verify effectiveness of the algorithm.

Provided is a method and apparatus of processing an image using filters. The method and apparatus receives an input pixel and a pixel array associated with the image, identifies a color of the pixel array to facilitate processing the input pixel and the pixel array associated with the image and locates the color and the association with a corresponding image enhancement operation in a color lookup table.

Creating a look-up table which converts color image data from a device-independent color space to a device-dependent color space, by determining a range of lightness values corresponding to a lightness value of a target data point in device-independent color space, searching a predetermined set of data points in device-independent color space to obtain a selected set of data points, each selected data point having a lightness value within the determined range of lightness values and having corresponding device-dependent component values within a predetermined tolerance level of the component values of a previously-determined device-dependent data point, performing a weighted interpolation on the device-dependent component values corresponding to the selected set of data points to calculate an interpolated data point which is in device-dependent color space, and entering the interpolated device-dependent data point into a look-up table entry corresponding to the device-independent target data point.

An imaging system includes an array of photodetectors that produce an array of intensity values. Image and display processing components of the imaging system produce an array of display-formatted pixels for display on an imaging system display. The display-formatted pixels include a first plurality of pixels associated with a color lookup table and a second plurality of pixels associated with a grey-scale lookup table. The image and display processing components compare pixel intensity values to temperature criteria and apply the color lookup table to pixels satisfying the temperature criteria and apply the grey-scale lookup table to pixels not satisfying the temperature criteria.

This disclosure provides methods, systems and apparatus for jointly optimizing node locations and corresponding output value of a color look-up-table (LUT) associated with an imaging device. According to one exemplary method, initially a set of LUT node locations are generated by solving a first optimization problem and subsequently, a set of LUT node values are generated by solving a second optimization problem.

A normal vector mapping unit maps a texture of the MIP-map level corresponding to a level of detail (LOD) of a polygon onto a polygon surface to generate a pseudo-normal vector on the polygon surface. A normal vector replacing unit refers to the vector quantization (VQ) table of the relevant MIP-map level and replaces the pseudo-normal vector on the polygon surface with a quantized reference normal vector. A brightness value acquiring unit refers to the color lookup table (CLUT) of the relevant MIP-map level, and acquires the brightness value corresponding to the reference normal vector on the polygon surface. The brightness value acquiring unit also interpolates brightness values between different MIP-map levels. A graphic processor combines the RGB value of each pixel of the polygon surface with the brightness value acquired by the brightness value acquiring unit to write the combined data into a frame buffer.

A method of simultaneously transmitting a video signal and encoded data representing graphic images is disclosed. The invention is particularly applicable for transmitting multilingual subtitles with a video program. The graphic images are rectangular regions within the active video area. They are transmitted in the form of bitmaps. The invention not only allows any character font or size to be displayed, but also the definition of e.g. a program provider's logo. The encoded data includes a time stamp to specify the time at which a subtitle is to be displayed. Preferred embodiments of the invention include the transmission of colour-look-up-table (CLUT) data and a compatibility code indicating a required minimum number of entries of said colour-look-up-table. For receivers with a CLUT having more entries than necessary, a map table is transmitted for mapping the pixel data width to the input witdh of the relevant CLUT. The method is applicable to Direct Video Broadcast systems wherein the video signal is MPEG2 encoded and the graphic images are accommodated in a private data stream of an MPEG2 Transport Stream.

The invention discloses a display device and a method for processing the color data of the same, wherein the display device comprises a display unit, a display control circuit and a color processing module; the display control circuit is used to receive input red, green and blue signals, so as to indicate the color processing module to correct the input red, green and blue signals and to control the display unit to display the image picture determined by a corrected object color signal returned by the color processing module; the color processing module, according to the indication of the control circuit, is used to inquire a standard color space corresponding to the input red, green and blue signals according to a standard color look up table; moreover, an equipment color look up table acquires the object color signal corresponding to the inquired standard color space, and corrects the input red, green and blue signals to the acquired object color signal which is sent to the display control circuit. On the basis of ensuring color reductibility, the display device can carry out correction management of an image picture.

The invention relates to a two-waveband video fast naturalness color integration method based on a color look-up table, belonging to the field of color night vision imaging. The method comprises the following steps: building a two-dimensional color look-up table according to correspondence of pixel gray value and color value of a two-waveband gray level image and a naturalness color image obtained by a color delivery method; obtaining the complete color look-up table according to the principle that the closer the Euclidean distance among the pixels is, the more similar the color is; and building operation modes which are beneficial to perception scenes of different observers in practical application by carrying out two-waveband video fast naturalness color integration by the complete color look-up table. In the invention, color assignment is directly carried out to all frame images of input video by the two-dimensional color look-up table, so as to greatly promote the operation speed of the algorithm; the stability of scenery colors in the integration video is obviously improved. As the color effect of the integration video is chose by the observers, so as to be beneficial to scene perception of the observers and be accordance to the operation modes in practical application.

The invention discloses a color correction method of a multi-projector display system. The color correction method of the multi-projector display system is characterized by comprising the following steps: (1) switching is conducted between a color space for imaging of a camera and a color space input by projectors, a red green blue (RGB) color space is switched to a YUV color space; (2) the camera is calibrated so as to obtain a vignetting function and a nonlinear response function of the camera; (3) the projectors of the multi-projector display system are calibrated according to the calibrated camera, a nonlinear response function of each projector of the multi-projector display system is obtained, and black excursion distribution and maximum brightness distribution of each projector are obtained according to the calibrated camera; and (4) a public response function, public black excursion distribution and public maximum brightness distribution of the whole multi-projector display system are obtained through calculation, a correction template is obtained, a color checking chart is generated, projected images are corrected by utilizing the color checking chart, and the corrected projected images are projected on a projecting screen by each projector of the multi-projector display system. The method can solve the problem that the lightness of the multi-projector display system is inconsistent, lightness correction of main stream projectors such as a liquid crystal display (LCD) and a digital light processor (DLP) is supported, and the dynamic range of projected contents is improved as far as possible.

The invention losslessly encodes multidimensional data such as a color lookup table in which neighboring elements in a space have high correlations, by a simple arrangement at a high compression ratio. To this end, a multidimensional data input unit inputs data of an X-Y plane in an order of Z=0, 1, 2, . . . from a lookup table expressed by three-dimensional X-, Y-, and Z-coordinates. An inter-plane difference generation unit calculates differences D between elements of two neighboring planes, and outputs the calculation result as two-dimensional inter-plane differences. A prediction error generation unit considers data Di of interest in the inter-plane differences D as an element of two-dimensional data, and outputs a difference e from a predicted value p, which is obtained with reference to already encoded data, to a prediction error encoding unit. The prediction error encoding unit generates and outputs a codeword from the inputted difference e.

An image forming apparatus includes a user interface, and an image forming unit to perform an image forming job in a new image mode by combining two or more image modes when the two or more image modes are selected through the user interface. The image forming unit may include a controller to combine color lookup tables of the two or more selected image modes and to create a new color lookup table, and an engine unit to perform the image forming job in an image mode corresponding to the new color lookup table. Therefore, it is possible for the image forming apparatus to support various image modes.

The invention losslessly encodes multidimensional data such as a color lookup table in which neighboring elements in a space have high correlations, by a simple arrangement at a high compression ratio. To this end, a multidimensional data input unit inputs data of an X-Y plane in an order of Z=0, 1, 2, . . . from a lookup table expressed by three-dimensional X-, Y-, and Z-coordinates. An inter-plane difference generation unit calculates differences D between elements of two neighboring planes, and outputs the calculation result as two-dimensional inter-plane differences. A prediction error generation unit considers data Di of interest in the inter-plane differences D as an element of two-dimensional data, and outputs a difference e from a predicted value p, which is obtained with reference to already encoded data, to a prediction error encoding unit. The prediction error encoding unit generates and outputs a codeword from the inputted difference e.

A calculation unit (58) references texture data (62) in a storage unit (60) and acquires texel information of index color formal An integral look-up table (64) has a structure containing a plurality of color look-up tables based on the detail degree (LOD) of the area to be plotted A look-up table reference unit (70) selectively references the color look-up table based on the LOD stored in the integral look-up table (64) according to the LOD value of the texel obtained by the LOD calculation unit (68), acquires color information corresponding to the index value of the texel, and outputs it to the calculation unit (58). The calculation unit (58) performs filter processing such as bi-linear interpolation according to the texel color information and outputs the texel information after the processing.

Disclosed is a method for producing radar display images and a system thereof, wherein, the system comprises: two A / D converters for respectively implementing sampling processing to radar interface image video signals and radar original image video signals with VGA formats, and respectively outputting horizontal synchronizing signals, field synchronizing signals and digital RGB signals; a buffer for carrying out buffer processing to radar interface image video signals and radar original image video signals; and a radar image generation module realized through an FPGA chip for implementing synchronous processing to radar interface image video signals and radar original image video signals and looking up table indexes by colors for implementing synthetic processing so as to generate the radar display image video signals. The method and system need not use the special radar image generator, and can utilize the general control program to realize the superposition processing to radar original images and radar interface images in the FPGA chip, thereby producing the radar display images meeting the requirements of radar image display terminals.

The invention losslessly encodes multidimensional data such as a color lookup table in which neighboring elements in a space have high correlations, by a simple arrangement at a high compression ratio. To this end, a multidimensional data input unit inputs data of an X-Y plane in an order of Z = 0, 1, 2,... from a lookup table expressed by three-dimensional X-, Y-, and Z-coordinates. An inter-plane difference generation unit calculates differences D between elements of two neighboring planes, and outputs the calculation result as two-dimensional inter-plane differences. A prediction error generation unit considers data Di of interest in the inter-plane differences D as an element of two-dimensional data, and outputs a difference e from a predicted value p, which is obtained with reference to already encoded data, to a prediction error encoding unit. The prediction error encoding unit generates and outputs a codeword from the inputted difference e.

Sensor independent display characterization system spectrally characterizes a display system to measure radiant power emitted by the display system that displays a video image to a trainee pilot during sensor stimulation. A sensor spectral response for each wavelength produced by the stimulated sensor is determined. A stimulated luminance for each color level of the displayed image or for a range of color levels is computed. A color look up table that maps computed stimulated luminance to a set of stimulating color values is generated. When a trainee pilot looks at the displayed image using a sensor having a sensor response that was used in computing the stimulated luminance, the pilot will see an image that was created by simulated spectral rendering. The displayed image is an accurate, display and sensor independent image that the pilot can see during the real flight.

A color processing method for identification of areas within an image corresponding to monetary banknotes includes dividing the image into a plurality of sections; extracting color histogram data for each section; assigning a color vector for each section according to the color histogram data for the section; comparing the color vector for each section to a color lookup table to determine a probability of the section corresponding to monetary banknotes; and selecting probable sections having the probability exceeding a first predetermined threshold.

Disclosed embodiments relate to techniques for color gamut mapping when an input signal transmitting color visual images has a different color gamut than does the output display device. Polynomial rubber-sheet mapping may be used to translate the input color gamut to the output color gamut on a hue-by-hue basis within a three-dimensional perceptual color space. Also, a memory color look-up table may be used to preserve memory colors in the input gamut which are capable of reproduction within the output gamut. By using such techniques alone or in combination, it may be possible to more effectively map an input color gamut to a different output color gamut with improved calorimetric accuracy.

Sensor independent display characterization system spectrally characterizes a display system to measure radiant power emitted by the display system that displays a video image to a trainee pilot during sensor stimulation. A sensor spectral response for each wavelength produced by the stimulated sensor is determined. A stimulated luminance for each color level of the displayed image or for a range of color levels is computed. A color look up table that maps computed stimulated luminance to a set of stimulating color values is generated. When a trainee pilot looks at the displayed image using a sensor having a sensor response that was used in computing the stimulated luminance, the pilot will see an image that was created by simulated spectral rendering. The displayed image is an accurate, display and sensor independent image that the pilot can see during the real flight.