Abstract: Provided is a color adjustment method for a display apparatus. The color adjustment method includes: measuring first luminance coordinate data indicating a luminance and color coordinates of a color displayed on a display device when image data corresponding to a white point is supplied to a drive circuitry; measuring second luminance coordinate data indicating luminances and color coordinates of colors displayed on the display device when image data corresponding to the white color of intermediate grayscale values are supplied to the drive circuitry; measuring third luminance coordinate data indicating a luminance and color coordinates of a color displayed on the display device for each of R, G and B elementary color points when image data corresponding to each of the R, G and B elementary color points is supplied to the drive circuitry; and calculating correction parameters based on the first to third luminance coordinate data.

Abstract: An apparatus and method for compensating color characteristics in individual display devices that each include a display unit including a plurality of pixels to display images according to compensated image data signals, a test data input section to transmit a predetermined test image data signal to the pixels to display a test image, a luminance measuring unit to receive luminance information from the display unit displaying the test image and determine actual luminance ratios of a first color, a second color, and a third color from the received luminance information, a compensation ratio determiner to calculate a compensation ratio from both the actual and reference luminance ratios of each color and a data compensator to generate the compensated image data signals by adjusting external input video signals according to the compensation ratio.

Abstract: A method of extracting from a picked-up image an object that is situated in the foreground of a projected backdrop. The method includes an extraction step comprising the steps of establishing a correspondence relationship between pixels of the projected backdrop and of the background of the picked-up image, and defining said object as the set of picked-up pixels that present a departure from said correspondence relationship. The method is applicable to video conferences, to remote teaching, and to television shows.

Abstract: A gain-determining method for grayscale white balance of a display apparatus comprising a panel is provided. The method first displays a white, a red, a green, and a blue images on the panel respectively and measures the chromatic values and luminance of the images. Next, the chromatic values and luminance of a target white image is inputted. Following, according to the measured chromatic values and luminance of the white, the red, the green and the blue images, a first set of color mixture ratios is calculated. Then, according to the chromatic values and luminance of the target white image and the chromatic values and luminance of the red, the green and the blue images, a second set of color mixture ratios is calculated. Finally, according to the first set and the second set of color mixture ratios, a red gain, a green gain and a blue gain are calculated.

Abstract: A measuring device for measuring a response speed of a display panel is provided. The measuring device includes a microcontroller and at least one photo sensor. The microcontroller provides a control command, according to which a display controller of the display panel provides test pattern to the display panel. The photo sensor senses a test frame displayed corresponding to the test pattern by the display panel, and provides a corresponding sensing signal associated with brightness and a response signal. According to the response signal, the response speed of the display panel is calculated.

Abstract: A system is disclosed for controlling operation of an electronic device, such as a TV. The system includes a first sensor located at or near the electronic device and a second sensor spaced apart from the first sensor, wherein the first and second sensors are configured to detect motion of a user within an operating zone associated with the electronic device. A processor is coupled to the electronic device and the first and second sensors, the processor being configured to input a signal from the first and second sensors. Memory is coupled to the processor, the memory comprising a sensing algorithm configured to process the input signal from the first and second sensors and determine the location of the user with respect to the operating zone. The processor is configured to send a control command to the electronic device based on an output of the sensing algorithm.

Abstract: An image processing apparatus having an input unit for inputting an image signal and an image corrector for correcting the input image signal is disclosed. The image corrector is arranged to extract from the input image signal a specular reflection component and a diffuse reflection component and generate a corrected image signal based on a computation result with respect to these specular and diffuse reflection components thus extracted. This image corrector is adaptable for use in various types of image processors, including projectors, display devices and imaging devices.

Abstract: An image processor that corrects an image signal, includes: a brightness component correction amount calculating section that calculates the amount of correction of a brightness component of the image signal only for an image signal in a predetermined brightness level range of a predetermined spatial frequency band; and a brightness component correcting section that corrects the brightness component of the image signal by using the amount of correction calculated by the brightness component correction amount calculating section.

Abstract: Arrangements and methods are provided that modulate various display device outputs in response to detected changes in environmental conditions affecting a display screen. The arrangement responds to changing environments to maximize the quality of the display. A sensor that is responsive to the changing environment, such as changes in ambient light, is provided to modulate the display accordingly. The arrangement contains logic for utilizing the sensing input and user preferences to provide the best display under the prevailing conditions.

Abstract: An image display device such as LCD television comprises: LUTs (look-up tables) which are tables of correction data for correcting color balance of a displayed image; gain adjustment units for providing gain to input signal values representing brightness levels of red, green and blue colors in image data of the displayed image; and a microcomputer for recalculating the correction data in the LUTs and updating the correction data to the recalculated ones. The microcomputer determines, as adjustment gain values, gain values which are provided to the input signal values by the gain adjustment units and which bring color balance of a white balance adjustment image to a predetermined color balance, and recalculates the correction data in the LUTs based on the correction data and the adjustment gain values. This image display device can increase accuracy of white balance adjustment and reduce time required for the white balance adjustment.

Abstract: An image processor that corrects an image signal supplied to an image display section, includes: a luminance component correction amount calculating section that calculates the amount of correction of a luminance component of the image signal according to visual environment only for an image signal in a predetermined luminance level range in a predetermined spatial frequency band; and a luminance component correcting section that corrects the luminance component of the image signal using the amount of correction calculated by the luminance component correction amount calculating section.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a set top box having a controller to receive a single video stream comprising two-dimensional image content and a depth map of the two-dimensional image content, generate three-dimensional image content in real-time from the two-dimensional image content and the depth map where the three-dimensional image content is generated when a display device operably coupled with the set top box is determined to be capable of presenting the three-dimensional image content, and provide either the two-dimensional image content or the three-dimensional image content to the display device. Other embodiments are disclosed.

Abstract: An optical device is capable of controlling a projector, wherein the projector is capable of wirelessly receiving an image signal from a data source, combining an identification signal into the image signal to generate a projection signal, and projecting a projection image according to the projection signal. The optical device includes an optical sensor. The optical sensor is capable of sensing the identification signal of the projection image, outputting a detection signal corresponding to the identification signal and wirelessly transmitting the detection signal to the projector. A projection system including a projector and an optical sensor is provided as well.

Abstract: Method and system for enhancing color saturation. According to an embodiment the present invention provides a method for enhancing color saturation. The method includes providing a color image characterized by a luminance component and two chrominance components, the color image including a plurality of pixels, the plurality of pixels including a first pixel being characterized at least by a luminance value, a first chrominance value, and a second chrominance value. The method also includes processing the first chrominance value and the second chrominance value. The method further includes determining a saturation level using based on the first chrominance value and the second chrominance value. Moreover, the method includes providing a factor for adjusting the first chrominance value and the second chrominance value, the factor being based on the saturation level. Furthermore, the method includes adjusting the first chrominance value and the second chrominance value using the factor.

Abstract: An image display device such as an LCD television comprises a microcomputer and LUTs (look-up tables) which are tables of correction data for correcting color balance of an image to be displayed. The microcomputer recalculates correction data in the LUTs and updates the correction data to the recalculated correction data based on: an input value InL of image data of a Low side white balance adjustment image; an input value InH of image data of a High side white balance adjustment image; and a gain value GainL and a gain value GainH which are provided to the input value InL and the input value InH, respectively, to bring color balance of the Low side white balance adjustment image and the High side white balance adjustment image to a predetermined color balance, respectively.

Abstract: Disclosed is the apparatus for controlling color temperature enabling the color region determiner to determine whether the inputted chroma signal value in pixels belongs to a pre-set achromatic color region or a chromatic color region, and the color temperature corrector to correct the chroma signal gains according to the determined achromatic color region or chromatic color region.

Abstract: Arrangements and methods are provided that modulate various display device outputs in response to detected changes in environmental conditions affecting a display screen. The arrangement responds to changing environments to maximize the quality of the display. A sensor that is responsive to the changing environment, such as changes in ambient light, is provided to modulate the display accordingly. The arrangement contains logic for utilizing the sensing input and user preferences to provide the best display under the prevailing conditions.

Abstract: A method for matching colors including comparing the appearance of a first white color associated with a first color imaging system and a second white color associated with a second color imaging system, wherein the tristimulus values of the first and second white color are similar; determining a fixed correction to the tristimulus values of the second white color to achieve a visual match to the first white color; measuring a first set of spectral values for a first color associated with the first color imaging system; determining a first set of tristimulus values from the first set of spectral values; measuring a second set of spectral values for a second color associated with the second color imaging system; determining a second set of tristimulus values from the second set of spectral values; applying a correction to the tristimulus values of the second color; determining a difference between the tristimulus value of the first color and the corrected tristimulus value of the second color; and adjusting th

Abstract: A method and an arrangement for evaluating sensor images of an image-evaluating surroundings-detection system on a moved carrier, preferably a vehicle (1), are proposed, wherein areas in the sensor images captured by a camera (4) which are dark in relation to the surroundings are evaluated in chronologically successive evaluation steps in order to determine whether said dark areas are moving toward the carrier at the speed of said carrier, and in that these dark areas are detected as shadows (7) of a static object and corresponding signaling is performed.

Abstract: An image display apparatus and a method of compensating for white balance are disclosed. The method of compensating for white balance of an image display apparatus includes reading a picture status mode (PSM) set in the image display apparatus, measuring the light amounts of RGB color signals from an external light source of the image display apparatus and detecting a color temperature of the external light source, calculating a difference between the detected color temperature of the external light source and a color temperature of the white balance of the set PSM, performing white balance gain compensation for correcting the color temperature of an input image according to the PSM using the calculated difference between the color temperatures, and displaying an image of which the white balance gain is compensated for.

Abstract: An image processing and controlling system is provided in the present invention. In addition to adjusting the image displaying modes according to the ergonomic look-up table, the present invention is further capable of adjusting the weighting value with respect to each image characteristic value of an initial image according to lighting characteristics of an ambient light system such that a display unit can provide the most comfortable viewing conditions and the best image quality under different ambient lighting characteristics. In another embodiment, the present invention further functions to control the ambient light system according to the image characteristics of the weighted output image. By means of the foregoing dual controlling ways, the image processing and controlling system may provide appropriate output images corresponding to different viewing scenario and conforming to the requirement of output quality.

Abstract: A rear projection display includes a projector for projecting light from a light source as an optical image, an exterior cabinet for enclosing the projector, a projection screen provided for the exterior cabinet on which the optical image is projected, and two or more optical sensors provided in a region where the optical image is projected from the projector other than an image display region.

Abstract: A method for obtaining a target color measurement using an electronic image capturing device comprising the steps of: (1) determining one or more of a field correction array, level correction vectors, a color correction matrix, and a calibration correction and; (2) adjusting a target color measurement based upon one or more of a field correction array, level correction vector, a color correction matrix, and a calibration correction to obtain a corrected color target measurement.

Abstract: A projection image display device including a display plane for displaying an image, a projection mechanism projecting an image on the display plane, and an imaging mechanism arranged on the same side of the display plane as the projection mechanism for imaging the display plane. The imaging mechanism is arranged at a position where a position symmetric with respect to the display plane of the projection mechanism is out of the range of the field angle of the imaging mechanism. By arranging the imaging mechanism at a position where no direct reflecting light of the light source of the projection mechanism comes, it is possible to prevent generation of a hot spot.

Abstract: A method for making uniform the colorimetric rendering of a display surface including several adjacent display screens (10a, 10b), comprising for each pair of adjacent screens (10a, 10b) steps of: periodically sampling (21) by a calculation device (5) image data in two corresponding screen (10a, 10b) areas (13a, 13b) in the pair of adjacent screens, analyzing (22, 23, 24) by the calculation device (5) image data sampled in each period to determine a difference in calorimetric rendering between the two screen areas, determining by a correction device (6) connected to the calculation device a process to be applied to the video stream to one of the two video systems controlling the two screens in the pair of adjacent screens, by applying a predetermined correction law to the difference in calorimetric rendering, and applying (26) by the correction device the process to said video system, in order to make the colorimetric rendering of the display surface uniform.

Abstract: A flat panel display device may improve picture quality by compensating a panel defect by use of a circuit and a picture quality controlling method. A flat panel display device includes a display panel. A memory stores a location information and a compensation value for a panel defect location on the display panel. A first converter calculates a brightness and color difference signals from red, green, blue video signals to be displayed in the display panel. The first converter expands the number of data bits of the brightness signal to generate the expanded brightness signal. A compensating part generates a compensated brightness signal by increasing or decreasing the expanded brightness signal of the video signal to be displayed in the panel defect location. A second converter calculates the red, green, blue signals from the color difference signal and the compensated brightness signal, and generates the compensated video signal by reducing the number of bits of the calculated red, green, blue signals.

Abstract: A method for correcting the white balance of a display by: setting a target color coordinates of a target white point of a target white point plane at a predetermined color temperature and a group of gray levels as the input gray levels in response to a user input command; constructing a white color image according to the group of the gray levels; measuring luminance and color coordinates of a measured white point of the white color image; estimating luminance of the R, G, B based on the standard color coordinates defined in a standard color space, the measured luminance and color coordinates of the measured white point; estimating gray levels of the R, G, B based on the estimated luminance of the R, G, B; and reconstructing the Gamma table based on the estimated adjusted gray levels of the two adjustable colors.

Abstract: A method for making uniform the colorimetric rendering of a display surface including several adjacent display screens (10a, 10b), comprising for each pair of adjacent screens (10a, 10b) steps of: periodically sampling (21) by a calculation device (5) image data in two corresponding screen (10a, 10b) areas (13a, 13b) in the pair of adjacent screens, analyzing (22, 23, 24) by the calculation device (5) image data sampled in each period to determine a difference in calorimetric rendering between the two screen areas, determining by a correction device (6) connected to the calculation device a process to be applied to the video stream to one of the two video systems controlling the two screens in the pair of adjacent screens, by applying a predetermined correction law to the difference in calorimetric rendering, and applying (26) by the correction device the process to said video system, in order to make the calorimetric rendering of the display surface uniform.

Abstract: A method and apparatus for calibrating color temperature of color display devices aims to calibrate output bases of RGB three original color lights of a color display device so that different color display devices can radiate the same color temperature in the same color temperature settings. The method of the invention uses a colorimeter to obtain current chromaticity value radiated from the color display device in a standard color representation system and in the condition of known output bases of the current three original color light signals, and through calculation to obtain the proportional relationship of the current radiating color temperature and an objective color temperature in the same standard color representation system, and based on which to derive the output bases of the required three original color light signals corresponding to the objective color temperature to be calibrated. The results are written through the apparatus into a color profile of the color display device.

Abstract: Device and method for compensating a picture quality of a projection type display, the device including a screen for displaying a picture projected from outside of the screen, a video processing part for receiving, and converting an analog video signal into a digital video signal, and adjusting an offset and a gain thereof, for making the video signal displayable on the screen, a sensing part for sensing the video signal from the video processing part and projected to a region of the screen, a memory part for storing reference video information, and a microcomputer for projecting the reference video information stored at the memory part onto the screen through the video processing part according to a user's picture quality compensation command, or a preset algorithm, and controlling the video processing part so that a luminance and chromaticity of the picture are calculated according to an output of the sensing part, the luminance and the chromaticity of picture are compared to preset values, and a compensati

Abstract: The need is met according to the present invention by providing a method of correcting pixel by pixel variations in a display, the method including the steps of creating a defect map of pixel intensity offsets for the display; correcting an input signal according to the defect map; and displaying the corrected input signal on the display, wherein the offset defect map is created by modulating a pixel in the display at a predetermined rate at a predetermined intensity; sensing the display with a photosensor to generate a sensed signal; demodulating the signal with a synchronous demodulator at the predetermined rate to produce a demodulated signal representing a sensed intensity; and employing the sensed intensity and the predetermined intensity to generate a correction offset.

Abstract: There is disclosed a display device using a color wheel having a color filter Cw, in addition to normal color filters corresponding to the three primary colors. The filter Cw has almost flat spectral transmission characteristics. Brightness information included in a color image signal is quantized with (n+m) bits. Information corresponding to the lower-order n bits is displayed by light transmitted through the filter Cw. Information corresponding to the upper-order n bits is displayed by light transmitted through the normal color filters. Only brightness information to which the human eye is visually sensitive is reproduced by the filter Cw having a lower transmissivity. This can eliminate a lack of the number of gray levels due to a constraint on the minimum switching speed of a light valve. Furthermore, the brightness little deteriorates.

Abstract: In a camera and method, a white-compensator propagates neutral light at a preset color temperature independent of a displayed electronic image. The camera has a body and an electronic imager disposed in the body. The imager generates an electronic image responsive to an incident light image. A display is disposed on the outside of the body. The display is operatively connected to the imager. The white-compensator neighbors the display.

Abstract: This invention relates to an apparatus and method for real-time testing of television picture colors. It can conduct real-time testing and adjusting of colors at various pixels to make tree and grass greener. The apparatus in accordance with the present invention includes a chromatic-coordinate testing circuit and a chromatic-coordinate bias circuit for each set color and configuring them between the television signal output and the video-driving amplifier. The pixel identified by the chromatic-coordinate testing circuit is the pixel to be adjusted. The chromatic-coordinate bias circuit controls and changes the bias current or bias voltage output to the video-driving amplifier in color television sets so that the connected three-color electron gun produces color bias effects on the monitor screen.

Abstract: When an anomaly occurred in an optical system or light sources of a rear projection TV in which laser beams are employed as a light source, the anomaly is detected by sensors, the detected anomaly is transmitted to a microcomputer, and according to a signal from the microcomputer a laser light source control portion controls the laser beams from the laser light sources so as to stop or decrease generation of the laser beams. Thereby, danger is prevented in advance from being afflicted on a viewer.

Abstract: An intelligent luminance correction system is used in a vision system. The vision system has a video decoder, used to receive a video signal and decode the video signal into three basic components of red, green, and blue. A photodetector is used to detect the luminance of the current environment, so as to export a reference signal. A color correction circuit is used to receive the reference signal and the three component of RGB. The color correction circuit also stores a vision response curve at dark condition and a vision response curve at bright condition, so that the color correction circuit can determine one curve of the vision response curve at dark condition and a vision response curve at bright condition according to environment luminance indicated by the reference signal. The three components of RGB thereby are corrected individual. After correction, the color correction circuit exports the corrected three components of RGB to a display.

Abstract: An apparatus and method for analyzing the brightness characteristics of a projected image and using the analyzed characteristics to improve the appearance of the projected image is disclosed. In one embodiment of the invention, the brightness characteristics of the projected image are analyzed at selected points across the raster of the image. An analysis array or array of data elements including brightness components corresponding to detail elements is then generated. The data elements in the array are then used to create compensation signals that are applied to the projected image through, for example, an overlay of smoothing factors or generation of a smoothing curve, to enhance the quality or appearance of the image by improving the regularity of brightness in all areas of the image. This regularity of brightness across the full span of the image is useful as a general improvement to the image and as a compensation for projector or projection surface brightness anomalies.

Abstract: A detector circuit detects a voltage corresponding to the leakage current that flows through the cathode electrode of a color display during a vertical blanking period of a video signal. The voltage detected is held in a first sample-and-hold circuit. Meanwhile, a reference signal corresponding to the reference black level is input during a part of the vertical blanking period of the video signal. A voltage corresponding to the leakage current that flows through the cathode electrode of the color display during the part of the vertical blanking period is detected by the detector circuit and then held in a second sample-and-hold circuit. The voltage held in the first sample-and-hold is subtracted from the voltage held in the second sample-and-hold circuit. A comparator circuit compares the difference between these voltages with a reference voltage. The result of the comparison controls a cutoff adjustment circuit for adjusting a DC level of the video signal.

Abstract: A method and an apparatus that verify the correct operation and calibration of a wobbling coil CRT monitor landing adjustment jig. The video test signal and the wobbling coil signal are disconnected from the CRT under test. The invention receives the video test signal and the wobbling coil signal and generates a modulated video test signal by modulating the video test signal with the wobbling coil signal. The modulated video test signal simulates a correctly adjusted CRT or a CRT with a known amount of misadjustment regardless of the actual state of adjustment of the CRT under test.

Abstract: A process for implementing shading corrections in a video projector. The process selects a color to be shaded, and then sets a projector video level at a selected high video level. A target brightness map is then generated for each of a plurality of preselected shading correction application points at the selected high video level. The process sets the projector video level at a selected low video level, and generates a target brightness map for each of the plurality of shading correction application points at the low video level. Actual light levels are then measured at both the high and low video levels for each shading correction application point, and differences between the target and measured brightness values are minimized. The shading process of the present invention is automatically preformed during projector set-up, and thereby eliminates the inherent subjective and time consuming need for conventional manual shading processes.

Abstract: A film image, which is taken into the developed photographic film, is picked up, and a reference maximum value and a reference minimum value of an image signal are determined by the image signal which is obtained when the image is picked up. The reference maximum value and the reference minimum value are used in the signal processing for adjusting the tone of the image, etc. Moreover, the exposure state of the film image is determined based on at least one of the reference maximum value, the reference minimum value, and the average value. If the exposure state is determined to be underexposured, the gamma in the gamma correction is smaller than the gamma during the standard exposure, so that the middle tone can be prevented from being dark. On the other hand, if the exposure state is determined to be overexposured, the gamma in the gamma correction is larger than the gamma during the standard exposure, so that the middle tone can be prevented from being too bright.

Abstract: A system for measuring the illumination uniformity of a liquid light value (LCLV) for a LCLV projector includes a projection device including a first LCLV. The projection device reflects light from the first LCLV to form an image on a screen. An image sensing device senses illumination values for a plurality portions of said image. A processor is coupled to the image sensing device and the projection device. The processor determines an optimum voltage bias which provides a maximum illumination for the plurality of image pixels. The illumination uniformity measuring system can independently measure the illumination non-uniformity of the LCLV and illumination non-uniformity resulting from other sources such as projection lens roll-off, screen gain, and other illumination non-uniformities. Using the measured illumination non-uniformity, a correction system can improve the quality of the displayed image.

Abstract: A CRT display system includes a CRT with a lenticular material placed upon the outward face of the CRT. The system further includes a sensing device in the field of view of the CRT and control circuitry connected between the sensing device and the CRT. The control circuitry is responsive to signals received from the sensing device to control the synchronization and formation of a composite of strips of visual input from four different perspective views of a scene to be presented on the CRT through the lenticular material such that a viewer perceives depth in the composite scene displayed on the CRT.

Abstract: A method and apparatus for reducing after images in motion video display. In the present invention, an intensity scaled image of a previous frame or set of frames is subtracted from the present frame before displaying the present frame. In the exemplary embodiment, the scaling factor is determined by measuring the intensity of the after image for the display device. In a preferred embodiment, the after image reduction system of the present invention takes into account the nonlinearities of the display device. That is the nonlinear relationship between the voltage applied to a display device and the intensity of the resulting display.

Abstract: An input signal is input to a detector and a synchronizing frequency of the input signal is detected by a frequency detector. Then, the number of the horizontal lines per vertical period of the input signal is determined according to the synchronizing frequency by a calculator. A control signal for defocusing an electron beam with which a blue fluorescent substance emits light is generated from a defocus controller according to the number of the horizontal lines of the input signal. Here, a range of control signals is previously stored corresponding to a range of numbers of horizontal lines. A focus signal for exactly focusing the electron beam is added to the control signal output from the defocus controller by an adder. Then, the defocus signal is output tom the adder. The defocus signal is amplified by a focus adjusting amplifier 15. The diameter of the electron beam with which the blue fluorescent substance emits the light is controlled according to the amplified defocus signal by a focus adjusting coil.

Abstract: A system and method achieve and maintain an accurate white point setting of a CRT display in a computing system. The CRT is initially calibrated by individually driving the individual color cathodes and by measuring tristimulus values and cathode beam current for each of the three primary colors. The tristimulus values are normalized by dividing each value by the beam current producing it, and the normalized values are then stored in a calibration memory contained in the display unit. A table of gamma values representing beam current as a function of video drive voltage is measured and also added to the calibration memory. Calibration of the display is implemented by driving the display controller with a white point value and calculating the cathode beam currents from the stored tristimulus values, required to produce an accurate CRT representation of the signal sent to the display controller.

Abstract: The invention pertains to a method and apparatus for performing dynamic purity correction to insure that color purity is maintained across the face of a color monitor. The monitor displays a plurality of pixels, each having a particular luminescence value. Each luminescence value has several color components (E.g. red (R), green (G) and blue (B)). A grid of luminance measurements is made across the face of the monitor for each color component. From these luminance value grids, smoothly varying correction values are computed for each color component of each pixel by the interpolation of cubic splines, such as a Catmull-Rom spline. Incoming digital video signals are multiplied by corresponding correction values to insure color accuracy of the monitor. In a preferred embodiment, the calculation of correction values is repeatedly performed in real time (at the display dot clock rate) in a single monolithic RAMDAC integrated circuit to increase speed, improve fidelity, and minimize use of memory space.

Abstract: A chromaticity meter measures chromaticity of light output for each of picture elements selected. Calculated from the measurement is corrective data on each of RGB colors, which in turn used to calculate corrective data on each of RGB at unselected picture elements. In this method, original video signals for each of RGB colors will be correctively modulated based on the thus obtained corrective data. A projected image displaying apparatus is constructed such that adjustment of chromaticity as to white as well as to black from the measurement by the chromaticity meter of chromaticity throughout the entire image, is carried out uniformly and reliably by automatic control using a microcomputer so as to determine optimal condition for correctively modulating the original video signal. This apparatus further includes means for storing the thus obtained optimal condition in a non-volatile memory.

Abstract: A gamma correction and white balance adjustment device has a calculator for calculating brightness target values expected to produce on a screen in response to calculated input signals to be applied to a CRT. The calculated input signals are actually applied to the CRT and the actual brightness values observed on the screen are measured. A table of a list of the calculated input signals expected to produce the brightness target values and a corresponding list of measured input signals which actually produced the calculated brightness target values is formed. An amplitude conversion circuit is provided for converting the amplitude of the input signal, which is equal to the calculated input signal, to that of the measured input signal in accordance with the obtained table.