337 results about "Color quality" patented technology

The invention relates to phosphor-conversion (PC) sources of white light, which are composed of at least two groups of emitters, such as ultraviolet (UV) light-emitting diodes (LEDs) and wide-band (WB) or narrow-band (NB) phosphors that completely absorb and convert the flux generated by the LEDs to other wavelengths, and to improving the color quality of the white light emitted by such light sources. In particular, embodiments of the present invention describe new 2-4 component combinations of peak wavelengths and bandwidths for white PC LEDs with complete conversion. These combinations are used to provide spectral power distributions that enable lighting with a considerable portion of a high number of spectrophotometrically calibrated colors rendered almost indistinguishably from a blackbody radiator or daylight illuminant, and which differ from distributions optimized using standard color-rendering assessment procedures based on a small number of test color samples.

The invention relates to methods and apparatus for feedback control of image and color quality in a direct-view MEMS display apparatus. The display apparatus includes a lamp capable of providing light, a sensor capable of detecting information indicative of characteristics of light provided by the lamp and outputting a sensor signal based at least partially on the information, and control circuitry for controlling illumination of the lamp based at least partially on the sensor signal.

A colour tunable lighting module is described which includes at least three solid state lighting emitters (such as light emitting diodes) and at least two wavelength converting elements (such as phosphors). The three solid state lighting emitters are formed of the same semiconductor material system and the light generated by them has dominant wavelengths in the blue-green-orange range of the optical spectrum. The two wavelengths converters are used re-emit some of the light from two of the emitters in broader spectra having longer dominant wavelengths, while the third emitter is selected to emit light at a wavelength between the dominant wavelengths of the light from the two emitters and the two converters. A control system may be employed to monitor and control the module and the lighting module can be optimised for tunable high colour quality white light applications.

The invention discloses a printing color quality detecting method of integrating visual measurement, density measurement and color measurement, which comprises the following steps: (1) based on the prior control strips, adding a spot color block, and placing the spot color block into an ink key area corresponding to a spot color part in a printed matter; (2) printing on a machine; (3) extracting the printed matter after a printing machine is stabilized to carry out visual measurement inspection, and taking out the printed matter passing the visual measurement; (4) measuring the colorimetric value of the printed matter by a colorimeter, and using the colorimetric value of the printed matter, the specified value of a sample and the color difference value of a digital sample or the prior sample as standards of qualification judgment; and (5) monitoring the density by adopting a density detecting method during printing. The method integrates respective advantages of the visual measurement, the density measurement and the color measurement, can detect the printing color quality more accurately, is simple and convenient, and is quite suitable for detecting the color quality of the printed matter.

This invention describes an apparatus, methods and a system for high speed hierarchical multiplexing the native color primaries of SSL-based display systems in order to improve color quality and stability as well as brightness and the efficiency of the display system.

According to example configurations herein, a downstream video processor operates in conjunction with an existing consumer-operated tuner system. The downstream video processor system can be an add-on system disposed in a communication link between the consumer-operated tuner system and a remote video playback device such as a hi-definition television. In lieu of processing video data locally in the set-top box, the consumer-operated tuner system can transmit the video data to the downstream video processor for processing. The downstream video processor in the communication link can be configured to provide enhanced video processing services (e.g., better resolution, higher frame rate rates, enhanced signal to noise ratio, enhanced color quality, 3-D graphics, etc.) with respect to video processing services supported by an upstream video decoder in the consumer-operated tuner system.

The invention relates to an infrared and visual pseudo-color image fusion and enhancement method. The method comprises the following steps: performing advanced partition treatment on infrared images to acquire three different area characteristics of background information, target information and cold target information, preserving characteristic information, performing pseudo-color fusion on the infrared and visual images under a color space of YUV to acquire pseudo-color fusion images, and then performing color transfer and color enhancement treatment on the pseudo-color fusion images by using a given color reference image to acquire final fusion images. The method can cause the final fusion images to have more area characteristic information, and furthest promote the color quality of the fused images at the same time of ensuring the instantaneity of a system.

In accordance with the invention inks suitable for use in ink-jet printers and method for using the same are provided. More particularly, inks comprising the present dye set exhibits excellent color performance and lightfastness across a range of media. Furthermore, the dye set enables good reliability in an environment having a relatively high concentration of precipitating agents. This reliability enables the use of precipitation bleed control mechanisms. More specifically, a specific dye set for formulating the yellow, magenta, and cyan inks is disclosed, comprising Acid Yellow 17 and a yellow dye according to Formula I; Acid Red 52 and a magenta dye according to Formula II; and Direct Blue 199 and Acid Blue 9; respectively.

Combinations of cationic underprinting fluids and anionic ink compositions that together achieve improved color quality and image stability in ink-jet printed images.

Organic light-emitting diodes (OLEDs) that produce white light include an anode, a hole-transporting layer disposed over the anode, a blue light-emitting layer disposed over the hole-transporting layer, an electron-transporting layer disposed over the blue light-emitting layer, and a cathode disposed over the electron-transporting layer. The hole-transporting layer is doped with both a yellow-emitting and a red-emitting dopant. When used together with red, green, and blue color filters, the OLEDs produce red, green, and blue light with good color quality and high efficiency. Also disclosed are multicolor display devices utilizing the OLEDs together with color filters or together with both color filters and liquid-crystal light valves.

The invention discloses a system for detecting surface color quality consistency of foodstuff at the end of cooking. The system comprises a color monitoring touch screen on a universal steam oven operation panel, a cooking mode selection button, a cooking control system, a video acquisition system in a universal steam oven and a cooked color processing system. The video acquisition system is arranged on an internal wallboard of the universal steam oven hearth. The video acquisition system contains a camera device and an LED lamp which is placed right below the camera device. By the adoption of the system for detecting surface color quality consistency of foodstuff at the end of cooking, surface color of foodstuff can be monitored at real time. The invention also provides a method for detecting surface color quality consistency of various batches of foodstuff at the end of cooking. According to the method, intelligent control of cooking termination time is realized by a computer vision technology so as to make surface color quality of foodstuff meet the predetermined consistency requirement of a chef.

Disclosed are phosphor compositions having the formulas [Ba_1-x-y-w-2zSr_xCa_yCe_z(Li,Na)_zEu₂]₂Si₅N₈, where 0<w<O.1, 0<z<0.1, 0<=x<1, 0<=y<1; [Ba_1-x-y-w-2zSr_xCa_yCe_z(Li,Na)_zEu_w]Si₇N₁₀, where 0<z<0.1, 0<=x<0.1, 0<=x<1, 0<=y<0.3; and [Ca_1-2x-y-w(Na,Li)_x+wCe_xEu_y]Al_1−wSi_1+wN₃, where 0<w<=0.3, 0<x<=0.1, 0<y<=0.1. When combined with radiation from a blue or UV light source, these phosphors can provide light sources with good color quality having high CRI over a large color temperature range.

The invention relates to an LED current driving system. The LED current driving system comprises an LED driver. The LED driver comprises at least one LED driving unit for outputting a driving current to an LED. Each LED driving unit comprises a plurality of current sources and a plurality of switches. The switches are connected to the corresponding current source. Each switch controls the ON/OFF state of the corresponding current source in accordance with the duty cycle control signal and a current control signal. Therefore, by integrating the LED driver on the LCOS panel, the LED current driving system of the invention can decrease the pin number of the LCOS chip, the overall area and the system cost so as to improve the yield of the LED current driving system. Besides, the LED current driving system utilizes the current sources to form the driving current to stably and precisely control the driving current flowing through the corresponding LED so that the color quality of the image can be improved.

The invention relates to a pathological image color quality comprehensive evaluation method based on color separation. The method includes step 1, performing color separation on pathological images; step 2, utilizing four indicators including red-blue contrast ratio, color deviation degree, color information entropy and gap area fragmentation degree; step 3, utilizing a sample set to train to acquire a neural network model, using the model to comprehensively evaluate a testing set, comparing an evaluation value with a truth value, and calculating accuracy. By the method, a gap in pathological image color quality evaluation is filled; a good evaluation result is acquired by utilizing color separation and a neutral network, and the method has wide application prospect in the field of pathological image quality evaluation.

The invention relates to a reading desk lamp evaluation method based on an ergonomic experiment. The reading desk lamp evaluation method comprises the steps of performance evaluation of average illumination and correlated color temperature, comfort level evaluation of average illumination and correlated color temperature, illumination uniformity evaluation, reflected glare evaluation, direct glare evaluation and color rendering property evaluation; an evaluation system is formed by outputs of respective evaluation scores of the six aspects and the weighted average of the evaluation scores; the establishment of performance evaluation of average illumination and correlated color temperature is based on a visual performance experiment; the establishment of comfort level evaluation of average illumination and correlated color temperature is based on a Christopher illumination-color temperature comfort curve; the establishment of illumination uniformity evaluation is based on a national standard; the establishment of reflected glare evaluation is based on a veiling reflected glare reception evaluation experiment; the establishment of direct glare evaluation is based on a national standard; and the establishment of color rendering property evaluation is based on quality factor (QF) indexes in a color quality grade drafted by American national standard institute. By adopting the reading desk lamp evaluation method, the relation between physical parameters and vision quality is established, a quality evaluation result can be output only by measuring the physical parameters of the reading desk lamp, the assessment routine is simplified, and the objectivity and the accuracy are higher.

Described are a method and an apparatus for color-corrected underwater imaging. A range to an underwater object to be imaged is determined and control values are selected according to the range. Control values are predetermined for a number of ranges according to an optimization of a color quality factor for each range based on the spectra of the optical sources used for illumination and the wavelength-dependent optical transmission of the water for the range. The optical power of each optical source is controlled according to a respective one of the selected control values. Advantageously, an acquired image requires no color correction as the adaptive illumination compensates for the wavelength-dependent losses in the light propagation path from the optical sources to the object and from the object to the imaging device.

The invention provides a method for detecting the color difference of a printed matter, which comprises the following steps of: firstly, respectively measuring the spectral reflectivity of a reference printed matter and the spectral reflectivity of a tested printed matter by using a spectrophotometer; secondly, calculating a color stimulus difference value of the reference printed matter and the tested printed matter; thirdly, calculating a tristimulus value difference of two colors of the reference printed matter and the tested printed matter; fourthly, calculating a difference of delta L*, delta a* and delta b* of the reference printed matter and the tested printed matter and a final color difference value of the two colors of the reference printed matter and the tested printed matter; and finally, judging whether the tested printed matter meets production requirements or not according to the color difference value. The method can accurately evaluate the color quality of the printed matter and can greatly improve the detection and control precision of quality of the printed matter so as to reduce rejection rate, reduce production cost, improve product quality and increase the added value of products.

A system and processes for the accurate measurement and control of image color values on a printing press with or without the presence of a color bar. More particularly, a barless color control system and processes for controlling the color quality of color images printed on a substrate online or offline, with or without a color bar printed on the substrate. The system provides an efficient and inexpensive method for barless closed loop color control and the processes are conducted without pixel-by-pixel comparisons.

A method and apparatus for launching a calibrator process by which the user is guided through the process of calibrating the conditions used by a particular print job is provided. Techniques are provided which calculate which print conditions will be used by the particular print job, which guarantees that the user is calibrating the correct conditions to get the best color quality for the particular job. The method and apparatus further provides techniques that allow the user to specify the conditions under which a calibration is considered expired in terms of time since the last calibration and the number of prints since the last calibration The method and apparatus further provides techniques for when the user encounters a new media type or print condition, the system can measure such and inform the user whether to create a new profile and/or new calibration set to get the optimal color quality.

The present invention relates to a wood treatment technology, and provides a method for inducing the color changing of a wood. The method comprises: immersing a selected wood in a previously prepared metal ion sulfate solution for 1 h at a temperature of 80 DEG C, carrying out water washing, and drying under a certain condition, wherein the metal ion sulfate solution is any one selected from the sulfate solution of metal ions such as Na<+>, Fe<2+>, Cu<2+> and Mn<2+>, the concentration of the solution is 10%, the heat treatment temperature of the heat treatment process is 80-130 DEG C, preferably 120 DEG C, and the heat treatment time is 8-20 h. With the application of the method of the present invention to treat the wood, the chromatic value of the treated wood is high, the treated wood is dark red or dark yellow, the color is uniform, stable and comfortable, and the use value of the low color quality wood is improved.