Abstract: The present invention provides a color testing system for testing intensities of color output from a screen of a display device. The color testing system comprises a reading probe for reading color output from the screen of the display device, a display equipment, and a color analyzer connected to the reading probe for analyzing the intensities of the color output from the screen of the display device. When testing the display device, the color analyzer will display a screen graph and a cursor on the display equipment corresponding to a next testing area on the screen according to a predetermined test track. The screen graph and the cursor will direct an operator to move the reading probe on the screen of the display device so that the reading probe can properly read the color output of each testing area along the test track on the screen of the display device.

Abstract: A method and apparatus for measuring a characteristic of a communication signal modulated with a composite video signal without the need for a synchronizing device. Samples are taken of an intermediate signal derived from the received communication signal that represents the power spectrum of the communication signal at different instants of time. From a priori knowledge of the spectral characteristics of the communication signal modulated with a composite video signal, predetermined features of the communication signal are identified based on the relative values of the samples collected over a period of time equal to an entire frame of the composite video signal. The sample with the maximum value of a plurality of sample values collected for one frame is coincident with the occurrence of a vertical synchronization pulse of the composite video signal, which occurs when no modulation is present, and therefore is representative of the power of the communication signal at the visual carrier frequency.

Abstract: A system for automatically aligning video images on display devices such as cathode ray tube (CRT) monitors that use the processor and memory of a host computer to implement the alignment process. The system uses a host computer processor and previously generated correction factor data, representative of specific display distortion characteristics, to produce driver signals necessary to affect the alignment of video images on a CRT screen. The previously stored correction factor data may be retrieved from a characterization module within the display device or from any other convenient storage location. The correction factor data is processed by the host computer to produce correction control data which is transmitted, over a bi-directional serial connector, or a video connector, to the display device where the data is read by correction and driver circuitry.

Abstract: A method assesses the quality of a television image. In diversity reception installations including several receivers, it is necessary to establish a criterion for selecting the receiver with the best image quality. For this purpose, the five vertical connection impulses are first detected in the video signal. The detection of the five equalization impulses initiates only after the vertical connection impulses have been detected. Then, the detection of the horizontal synchronization impulses, interfering impulses and the echo impulses is carried out only after the equalization impulses have been detected. The number of horizontal synchronization impulses, interfering impulses, and echo impulses detected is used as criterion for selecting the best receiver. The invention is applicable to diversity reception installations including several television receivers, in particular, for mobile installations.

Abstract: A colorimeter capable of calibrating color monitors, whether having cathode ray tube or liquid crystal (LCD) displays, is provided by a photometric array of photodetector and optical filter pairs. The filters include long-pass, edge filters which cover overlapping regions at the upper end of the visible spectrum and a filter which covers the entire visible spectrum. The outputs of the photodetectors are digitally synthesized to provide a response which mimics the response established by the Commission Internationale de l'Eclairage (CIE) xyz (bar) functions almost perfectly. The response which is mimicked may be represented by the CIE color matching functions. The pairs and the associated components are mounted on a printed circuit board captured in a clamshell housing and having an array of apertures which define angularly constrained fields of view of a surface from which the light, to be colormetrically analyzed, emanates.

Abstract: A received signal is converted in a frequency converter, an output from which is again frequency converted. The second converted output is detected by a detector and then converted into a digital signal to be stored in a memory. A spectrum display is provided by a display. A frequency sweep of local signals supplied to frequency converter is enabled. While holding the frequency sweep for the earlier stage suspended to receive one of the radio waves in service, a signal to the input of the frequency converter may be branched and demodulated by demodulation means. A vertical sync signal is separated in monitor processing means and the frequency of the local signal generator may be swept only during a no-modulation interval contained in a vertical blanking interval, thus extracting a carrier component and a noise component, the levels of which are determined to provide a measure of C/N.

Abstract: The standard brightness region is displayed with input values of zero. The comparison brightness region is displayed with an input value which is variable in the range of 0 to 255. The standard brightness and comparison brightness regions are displayed next to each other in the display. The input value is changed from zero. A first black point is determined as an input value which causes the comparison brightness region to first appear distinguishable from the black regions of the standard brightness regions. Then, the input value is changed from 255. A second black point is determined as an input value which causes the comparison brightness region to first appear indistinguishable from the black regions of the standard brightness regions. Then, a black point is calculated as an average of the first and second black points.

Abstract: A system and method for inspecting an image-producing display according to a predetermined footprint is disclosed. The system includes a platform fixed to a first multi-axis positioning unit for supporting the display. A sensing head is disposed in confronting relationship with the platform to detect light produced by the display. The sensing head is carried by a second multi-axis positioning unit. The system also includes a controller having outputs coupled to the respective first and second positioners. The controller is operative to generate control signals for manipulating the respective positioners and arranging the display and the sensing head into one or more relative orientations defining the inspection footprint.

Abstract: A mounting for a colorimeter enables it to make measurements of light emanating from a color monitor screen without affecting the colors produced by the screen or allowing the entry of ambient light which can affect measurements by the calorimeter. Pressure applied against a screen, especially of an LCD color monitor, can cause changes in the color of the light emanating from the screen. The mounting apparatus conforms to the screen, and seals the screen against ambient light entering into the calorimeter, while limiting the pressure against the screen. The apparatus is provided by a plate of compliant material, having an opening to which the calorimeter is attached. The surface of the plate, is disposed against the screen of the monitor. Since the pad is compliant, it seals the colorimeter from entry thereinto of ambient light. A strap can be expanded, and holds the pad on the monitor and against the screen. The strap is attached to the plate, and is placed around the back of the monitor.

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: In a method of measuring electron beam profile in an electronic display device, a matrix of video dots is displayed on a display screen of the electronic display device, each of the video dots being comprised of a group of phosphor dots illuminated by an electron beam. An image of a plurality of groups of illuminated phosphor dots forming the video dots within a field of view is then taken. The average horizontal and vertical distances of the video dots within the filed of view is determined and the groups of illuminated phosphor dots forming the video dots in the field of view that are captured in the image are superimposed based on the average horizontal and vertical distances of the video dots generally to average and fill in discontinuities between phosphor dots in the groups and thereby generate an overlay image of the electron beam. Cross-sections of the overlay image can be approximated and at least one intensity profile of the electron beam calculated.

Abstract: A test and alignment system for an electronic display device comprises a test pattern generator to be connected to an electronic display device for causing images of video test patterns to be displayed by the electronic display device. A test fixture is positioned in front of the electronic display device to be tested and aligned. The test fixture includes a frame supporting a plurality of close-up optical sensors to sense and produce image signals corresponding to small areas of images displayed on the electronic display device and a plurality of wide-angle optical sensors behind the close-up optical sensors for sensing and producing image signals corresponding to large areas of images displayed on the electronic display device. A computer controls the test pattern generator and processes and analyses the image signals generated by the close-up and wide-angle optical sensors to perform a series of tests on the electronic display device.

Abstract: Attentional maps that reflect the subjective view of an observer to the effects of degradation in a video image are used in the objective measurement of video quality degradation. The observer assists in generating an attentional map for each image of a test image sequence, which provides different thresholds or weighting factors for different areas of each image. A video image sequence from a system under test is compared with the test image sequence, and the error results are displayed as a function of the corresponding attentional maps.

Abstract: In a method of measuring a focus of a cathode ray tube, a predetermined image is displayed at a predetermined position on the screen of the cathode-ray tube. A focussing voltage of the cathode ray tube is changed under a condition that a distance from a reference position to a predetermined position in the image is detected. A change state of the detected distance is displayed on a display. Further, an image having representation of at least a vertical-direction line and a horizontal-direction line is employed as the predetermined image. A line sensor is located so as to cross both of the vertical-direction line and the horizontal-direction line to set a predetermined position of the line sensor as the reference position.

Abstract: A video level measuring apparatus for use in conjunction with setup and maintenance of an imaging system, such as an X-ray imaging system, is configured for first and second modes of operation. In the first mode of operation, a measure signal indicative of the average video level of the portion of an input video signal produced by the imaging system within an operator positionable and sizable window area is formed and converted to a numeric displays and an augmented video signal is presented as an output video signal in which the window area of the corresponding image has a video level which is increased by a uniform adjustable amount. In the second mode of operations, a test pattern video signal corresponding to an operator positionable and sizable window of uniform operator adjustable brightness against a black background is presented as the output video signal applied to a monitor.

Abstract: A measuring device for measuring a glow center of a display device is provided with: an image pickup device which includes a sensing surface defined by a plurality of photoelectric conversion elements arranged in a two-dimensional manner at a specified pitch and picks up a light image to produce image data; an optical system which transmits a light image displayed on a display device to the sensing surface of the image pickup device; an optical system controller which controls the optical system to transmit the light image to the sensing surface in such a manner that the maximum spatial frequency of the light image at the sensing surface of the image pickup device is smaller than the reciprocal of the pitch of the photoelectric conversion element arrangement; and a calculator which calculates a glow center of the light image on the display device based on image data produced by the image pickup device.

Abstract: Adjustment of an electron beam landing position during thermal expansion of a shadow mask in a color cathode ray tube (CRT) on a production line of color television receivers is performed by calculating an optimum compensation value and converting the compensated data into a coordinate value and displaying it on the screen to decrease the conducting time of the CRT, and improve accuracy and uniformity of purity adjustment.

Abstract: Display apparatus comprises a display screen and drive means for generating an image on the display screen in response to a video signal input from an external video source. The drive means comprises gamma measurement means having a test signal generator for generating a test signal to produce a test image on the display screen, and output detection means for generating a sense signal as a function of the test image produced on the display screen.

Abstract: In a display device having a nonvolatile memory device, such as an active matrix type liquid crystal display device, display contents displayed on the display device are obtained by a camera device. The obtained information (corresponding to the display contents) is digital-converted and then processed to detect a defect and a nonuniformity on the display device, so that correction information is produced. The correction information is stored in the nonvolatile memory device of the display device. Display information to be displayed on the display device is processed using the stored correction information, so that display contents are corrected and a defect and a nonuniformity on the display contents are inconspicuous.

Abstract: A hole-size measuring system that enables measurement of the size of individual holes of a black matrix layer of a CRT. This system includes an imaging device for producing an enlarged image of holes of a black matrix layer, and an image processor for electrically processing the image produced by the imaging device to measure a size of the holes. A CCD camera may be used as the imaging device. The CCD camera may have an automatic focusing function and is movable along a black matrix layer. For a color CRT, the holes are divided into three groups for red, green and blue colors, and the image processor has functions of measuring an average size of selected ones of the holes in the respective groups.

Abstract: An apparatus for calibrating color settings of a computer monitor to cause a proofed image, i.e., a prepress image, to essentially match a printed image on a particular medium, allowing the aesthetic quality of the image to be adjusted prior to printing, thus saving time and money. Embodiments of the present invention comprise a first set of separate red, green and blue monitor sensors (RGB) coupled to the computer monitor to sense a reference image and a second set of RGB ambient sensors facing upwards to sense ambient illumination. A set of RGB digital displays indicate numerical values representative of the computer monitor illumination as read by the monitor sensors and adjusted by the ambient sensors. A predefined table is used to reference the indicated values for particular medium and these values are used to adjust gamma values on the red green and blue color guns of the computer monitor.

Abstract: The television apparatus of the present invention is an apparatus which displays an image corresponding to the television signal, is so arranged that the picture quality of an image signal can be adjusted according to the projection condition of the image when the image corresponding to the image signal is projected, so that the optimum image may be projected.

Abstract: A CRT measurement device includes an image pickup device for producing an electrical image signal with respect to a light image displayed on the CRT, an optical system having a movable focusing lens for providing a light image of varied sharpness to the image pickup means in accordance with position of the focusing lens, a sharpness detector for detecting the sharpness of a picked up image based on an electrical image signal each time the focusing lens is moved, a focal position detector for detecting a focal position of the focusing lens providing a most sharpness light image, a driver for driving the focusing lens so as to move to the detected focal position, and calculator means for calculating a characteristic of the color CRT based on the image signal produced when the focusing lens is at the focal position. This device assures automatic and accurate focusing.

Abstract: A process for measuring a targeting of an electron beam that passes through a slot in a shadow mask in a multiple-beam color picture tube and strikes a phosphor stripe on a screen of the tube includes: exciting a luminous stripe in the phosphor stripe, recording an image of the luminous stripe with an image converter, determining outer edges of the phosphor stripe, generating an electron beam in the picture tube to illuminate a luminous spot on the phosphor stripe, recording an image of the luminous spot, determining positions of outer edges by analyzing the image of the luminous spot, and comparing locations of the outer edges of the phosphor stripe with the positions of the outer edges of the luminous spot to determine the targeting of the electron beam.

Abstract: A computer color monitor portable testing apparatus includes a programmable microprocessor storing a software program and producing timing and control signals in response to operation of the program to generate selected color patterns on a selected one of different types (CGA, EGA and VGA) of color monitors to be tested, a pair of connectors one of which can be selected for connecting with a selected one of the different types of color monitors to be tested, and a mode selector switch connecting the microprocessor with the connectors and being actuatable for selecting the different operational modes for testing the different types of monitors.

Abstract: A subtractive measurement technique in which a CRT display light intensity output is biased above a noise range of a low cost sensor by turning on one or more electron beam guns to produce light levels above the noise range. A bias value is measured. Electron beam guns for colors other than the color being measured are turned on. The gun for the color to be measured is then incremented through its operating range and measured light intensity values at each step are obtained using the sensor. The bias value is subtracted from the measured values to obtain the actual light intensity values for the color primary control value to luminance transfer curve being characterized.