Abstract: A method and apparatus for implementing a video test generator having an overlay cursor and an associated scope trigger are presented. A user interface permits a user to move a cursor across a displayed image, and to select a scope trigger point in the analog video stream based on the location of the cursor in the displayed image. Video waveforms associated with particular image pixels of interest or groups of pixels are observed on an oscilloscope by placing the cursor over the subject pixels or pixels on the video display and using the derived scope trigger to time the capture of the video waveform on the oscilloscope. The cursor is generated by tracking the horizontal and vertical position of the cursor, and altering or substituting out the video signal where the pattern of the cursor should appear.

Abstract: A video signal processing integrated circuit comprising: a test signal generation circuit configured to generate a test signal in conformity with video additional data superimposed on a video signal; a data slicer configured to binarize the test signal through comparison with a slice level, the test signal being supplied from the test signal generation circuit; and a data processing circuit configured to perform data processing of the video additional data binarized by the data slicer.

Abstract: A method and apparatus are presented for dynamically testing video equipment. One or more test patterns utilize different regions of video signal characteristics. Adjustment is made to the video characteristics of a region until a perceived parameter of the region matches a second region. A performance parameter of said video equipment is determined from said adjustment.

Abstract: An image processing device including an encoder processor and a decoder circuit. The encoder processor receives image data from a sensor and encodes the data with padding data if a series of bytes indicative of command sequence occur within the image data. The decoder circuit receives the image data and the padding data, and removes the padding data from within the image data.

Abstract: Embodiments of the present invention relate to a method of measuring a test video frame. A test video input is provided, along with an artifact measurement control, a gradient change measurement is performed based upon the test video input and a gradient change measurement map is provided.

Abstract: A versatile video pattern and audio pattern generation module, that can be integrated onto a video integrated circuit (IC) to generate functional video test input data, in HDMI format, for gray bars, color bars and moving bar data patterns, and to further generate single-tone audio signals, is disclosed. This video signal generator can be made part of the built-in-self test (BIST) to allow simplified testing of the IC. The signals generated can be used to test the video and audio functionality, as well as enabling a system to be demonstrated in the field. The output of the generator during the demonstration can be displayed using any suitable video display enabling simplified demonstration set-up. These video and audio signals can bemused as a diagnostic tool by the consumer and also for debugging the IC and system as may be necessary.

Abstract: Embodiments of the invention are directed towards methods and systems for playback of a content item by a media player. The method according to one embodiment comprises loading a content item into the media player, checking user preferences to retrieve a user value function and determining if available bandwidth exceeds a threshold. If the available bandwidth exceeds the threshold, the method initiates playback of the content item by the media player. If the available bandwidth is below the threshold, the method initiates playback of the content item by the media player on the basis of the available bandwidth and the user value function. If the media player is unable to retrieve the user value function, the method presents a calibration interface at the media player, the calibration interface operative to receive a user value function from a user and optimize playback of the content item.

Abstract: The present invention is a method for MPEG compliance testing that designs test bit streams such that every frame of the expected decoded video is known. The test bit stream is generated, decoded and stored as an expected output decoded video. The test bit stream is fed to the device under test where it is decoded. Actual output video is compared with the expected decoded video on a frame-by-frame basis. The test results are indicated by discrepancies, which can be visually examined by human or by computer, through a comparison of the two videos. During generation of the test bit stream, for a given GOP structure, the subsequent P and B frames are determined by varying the selected testing MPEG parameter with the whole range of its possible values, while keeping other parameters constant.

Abstract: A measurement pattern is moved on a display, and an image of the measurement pattern is captured by making a visual field of an image sensor follow the scroll of the measurement pattern. On the basis of the captured image, a motion picture response curve is obtained. Then, the motion picture response curve is transformed into an MTF (modulation transfer function). A normalized spatial frequency value N_Sf(a %) at which an MTF value starts declining by a predetermined percentage from a highest luminance portion of the MTF is determined. Then, the motion image quality of the display is evaluated on the basis of the normalized spatial frequency value N_Sf(a %). Thus, the evaluation of the motion image quality of the display can be achieved on the basis of an intuitively understandable motion image quality evaluation index.

Abstract: The present invention is a method for MPEG compliance testing that designs test bit streams such that every frame of the expected decoded video is known. The test bit stream is generated, decoded and stored as an expected output decoded video. The test bit stream is fed to the device under test where it is decoded. Actual output video is compared with the expected decoded video on a frame-by-frame basis. The test results are indicated by discrepancies, which can be visually examined by human or by computer, through a comparison of the two videos. During generation of the test bit stream, for a given GOP structure, the subsequent P and B frames are determined by varying the selected testing MPEG parameter with the whole range of its possible values, while keeping other parameters constant.

Abstract: A method and apparatus are presented for dynamically testing video equipment. A test pattern utilizes a presentation of alternating pixels and lines, along with features of the electronic video/graphics generator in which it is present to effect a close approximation to the demonstrable contrast transfer function percentage of the system or display under test. The test pattern, while depending on features of the electronic video/graphics generator for convenience of operation, may also be modified to be used as a static pattern capable of very similar utility.

Abstract: A technique for managing the production, post-production and distribution of audio-visual projects permits accurate management of production values and thereby allows accurate and measurable reproduction and control. Test signal data is used to assist the operator in insuring the levels are set to the intended display characteristics in the event that factors such as creative lighting or applied effects affect the desired look of the scene. The test signal data may encompass elements that determine resolution, white level, black level, grey steps, frequency response and linearity as well as sound parameters. Chroma channels may exhibit similar signals including a bar pattern that can be used to insure the best colorimetry is maintained. Standard signals may also improve compositing and cross media transfers for matching production values.

Abstract: A video graphics array color signal generator is provided. The signal generator includes an FPGA (field program gate array) device (1), a PROM (programmable read only memory) (2), a PLL (phase locked loop) circuit (3), a D/A (digital/analog) convertor (4) connected with the FPGA device, a VGA (video graphics array) interface (5), a pixel clock generator (6) which generates pixel clocks continuously at a frequency, and a keyboard (7) which provides operating buttons for users.

Abstract: A computer executable image quality detection system is provided, which comprises: a scaling symmetry testing unit, for testing the image scaling symmetry of an image signal; a luminance/chroma testing unit, for testing the separation of luminance and chroma of the image signal; a de-interlace testing unit, for testing the dynamic movement of the image signal; a color bar testing unit, for testing the color purity distinction of the image signal; a luminance compensation testing unit, for testing the Gamma compensation of the image signal; and a high/low frequency testing unit, for testing the high frequency and low frequency signal presentation of the image signal. By simultaneously executing the respective testing units, the producers' procedure and time for developing and testing are simplified and shortened.

Abstract: A monitoring system for an RF transmission system, such as a multi-channel television broadcasting antenna feed system, gathers data about the physical and electrical condition of the RF transmission system in real time. The system can detect and localize deterioration and other time-dependent faults in the transmission system by the tendency of faults to produce reflections back to the transmitter that were not part of the original characterization of the installation. Some kinds of faults, identified early enough, can be corrected without replacing components, and especially without shutting down the transmission system during prime viewing hours in the case of television broadcasters, or during a critical period of use of the system in the case of other user types. Other faults can be detected in time to order replacement parts before the underlying problem becomes severe, and to allow servicing during periods of low demand.

Abstract: A video signal generator, employing a multi-output amplifier and a video signal connector, is physically connected to a device under test to eliminate the use of signal cables, to solve the impedance matching issue, and to reduce noise from the signal cables' exposure to high temperatures. Moreover, the video signal generator employs a video algorithm stored in a programmable microprocessor and instructions downloaded to provide on-line adjustable video patterns sets for test. The video signal generator includes the programmable microprocessor, a television encoder, a multi-output amplifier, and a video signal connector.

Abstract: In order to stabilize a displayed color and to attenuate printing when measuring a color patch for preparing a color conversion profile, an accurate measurement is obtained by waiting for a certain time, repeating the measurement until measurements settle down or using a measurement obtained when the measurements of color patchs of different sizes all become equal. When preparing a matrix profile, which should be stored for higher accuracy, a ? value or a TRC value is judged and a selected value is stored in the profile. Both a matrix profile and an LUT profile are prepared and a profile with higher accuracy is stored as an available one.

Abstract: Method for controlling stroke video generation components by creating a program to command the video generation components to provide video signals and integrating high level software constructs into the program. Integration of the high level software constructs into the program may entail integrating a GOTO command to enable repetition of a section of the program and repetition of a display sequence provided by implementation of that section, integrating a GOSUB and RETURN command to enable multiple use of a single section of the program at different locations within the program, integrating a conditional command to enable one portion of the program to be implemented when the condition is satisfied and another portion to be implemented when the condition is not satisfied, and/or integrating a DO-WHILE loop to enable repetition of a section of the program when a condition is satisfied and continuation of the program when the condition is not satisfied.

Abstract: A timing alignment or offset display shows the relationship between a reference signal and a test signal, in particular two analog or digital video signals. Timing extraction circuits derive a lower frequency signal synchronized to horizontal lines and a higher frequency signal synchronized to the pixel sampling rate. A reference time pulse is also derived from the reference signal. Two offsets are counted by determining a line count and a sample or clock cycle count between corresponding reference points in the test and reference signals. A coarse line count offset and a fine timing offset are thereby obtained and are displayed by movable markers on opposite sides of a scale line. The markers are centering and aligned when the frame/field alignment and the color and/or sample portions of the signals correspond in time. Tabular data, distinct coloring and alarms also are depicted.

Abstract: A DTV receiver test stream generator which prevents discontinuity phenomenon of a video and an audio, a method for generating the DTV receiver test stream, and a recording medium where the DTV test stream having no discontinuity phenomenon is recorded. To this end, a test stream for a function test or a performance valuation of the DTV receiver is generated and a reproduction time is equalized on the basis of the least common multiple of a video frame time, an audio frame time, and a TS packet time when the test stream is repeatedly reproduced. According to this, when used at a DTV production field where a test pattern is used or at a broadcasting system which repeatedly transmits the DTV stream of a limited length such as a stationary image, a reliability of the DTV receiver test can be ensured.

Abstract: An apparatus for auto calibration of a display device, the apparatus including a signal generating unit for generating predetermined digital patterns, converting the digital patterns into R, G, B and Y, U, V color signals, converting the color signals into analog pattern signals, and outputting the analog pattern signals; a calibration performing unit for converting the analog pattern signals into digital pattern signals, adjusting the offset and gain of the digital pattern signals using control signals, and outputting the offset and gain of the digital pattern signals; and a control unit for operating the signal generating unit and the calibration performing unit once a calibration performing mode starts, comparing the digital pattern signals to reference values, and outputting the control signals for adjusting the offset and gain of the digital pattern signals such that the digital pattern signals are identical to the reference values.

Abstract: A dynamic controller for a light emitting active-matrix display, the display being responsive to code values for producing a light output, including: photosensor located on the display for sensing the light output from the display and generating a feedback signal representative thereof; a feedback signal converter for converting the feedback signal to a converted feedback signal having the same form as the code value; a code-value corrector including a memory responsive to a code value for producing a corrected code value; and an update calculator responsive to the converted feedback signal, the code value and the corrected code value to update the memory to minimize the difference between the converted feedback signal and the code value.

Abstract: A switch router and one or more gateways incorporating a diagnostic and calibration system that performs RF characterization of an underlying cable plant. The switch router is connected at a point of insertion or point of distribution and each gateway is located downstream, such as at corresponding subscriber locations. The switch router and each gateway sends a test signal with known characteristics and power level, and the receiving device determines noise level and power loss for the corresponding downstream and upstream channel pair. The power loss information is used to calibrate the power level of the transmitters. The noise levels are used to determine if the selected modulation schemes employed for normal communications is realizable. A frequency analysis, such as FFT or the like, is performed on the upstream test signal spectrum to derive valuable frequency information for the upstream channel or the entire upstream bandwidth.

Abstract: The invention is directed to an apparatus for calibrating an output of an image output device, comprising an image input device configured to image an output of the image output device; and a test pattern generator having an output of a dynamic test patch area and a grating area connected to an input of the image output device and responsive to the image input device for adjusting an intensity level of the dynamic test patch area to match an average intensity level of the grating area.

Abstract: A picture quality diagnostics apparatus and method generates a human vision model response based on a human vision model for a test input video signal. Also objective measure maps for different impairment types are generated from the test input video signal. The objective measure maps are applied as masks to the human vision model response to produce objectively filtered subjective maps. The objectively filtered subjective maps are analyzed to give the respective proportions of the different objective impairment types contributing to perceptual impairment or difference for the test input video signal.

Abstract: A display device comprises an inspection circuit for inspecting a data reception related circuit to generate inspection information, an inspection result image generation circuit for generating image data indicating the inspection information, a display switching circuit for superimposing inspection result image data on test video data, and a display unit for displaying the test video data superimposing the inspection result image data. As a result, it is possible to carry out inspection after assembly of the display device without disassembling the display device. This in turn makes it possible to carry out a test in a simple manner on the data reception related circuit inside the display device without changing noise environment inside the display device.

Abstract: A display having separate transmitting and receiving sets is provided with a feature to simplify adjustment to the video signal transmission path between the both sets. The display employs a directional video signal transmission path and a sub communication path using a non-directional communication medium independent from the transmission path. Fine adjustment to subtly adjust the spatial matching of the video signal transmission path is carried out using a control signal transmitted through the sub communication path. Coarse adjustment to roughly adjust the spatial matching of the video signal transmission path is carried out using a test video image displayed at the display portion of the receiving set. These fine adjustment and coarse adjustment are combined to keep an optimum spatial matching of the video signal transmission path between the sets.

Abstract: A VDSL customer drop testing arrangement and equipment utilizes a test set top box having a sign-on identifier unique to an authorized test device to perform testing of the customer drop without the need to provision the drop for receipt of video programming or data services from any network information or service providers (VIPs or DSPs). Because the test arrangement of the present invention does not require such provisioning, isolation of the customer drop is achieved. Such isolation insures that the test set is not being affected by problems originated from a VIP or DSP.

Abstract: A self-testing video display device and method of use. A video display test program is stored in a video processing unit inside a video display device. The test program includes a plurality of video test patterns and is accessible by entering a “secret” keycode combination on a keypad of the video display device. The self-testing video display device allows a service center operator to evaluate a malfunctioned video display device at the user's location through telephone or internet. An end user may also use the video display test process to set up, evaluate, and calibrate the self-testing video display device at the user's location.

Abstract: A method and apparatus is provided for dynamically generating digital video streams without an equivalent analog stream. The apparatus includes a configuration manager. The configuration manager presents configuration options to a user. User selections are recording as user preferences. The configuration manager is coupled to a media generator, which generates intermediate digital content based upon the user preferences. The media generator may be coupled to a local storage for storing electronic audio and visual information. The intermediate digital content is transferred to an encoder, which encodes the intermediate digital content to a digital format specified by in the user preferences.

Abstract: It is an object of the invention to measure the precise color characteristic of an image pickup machine and accurately reproduce a subject in an image display unit. A color characteristic measurement apparatus which has a test chart (1) as a subject of an image pickup machine (6), a hole (2) made in the test chart (1), a black box (3) placed on a rear face of the test chart (1) and formed on an inner surface in black, and a light output section (4) placed in the black box (3) at a position where the light output section (4) can be observed through the hole (2) from the outside.

Abstract: A display characteristics recognition apparatus has a color chart data output unit outputting a color chart data representative of a predetermined color chart to a display unit, a color name input unit for entering a name of a color of the color chart, and a display characteristics identification unit for determining display characteristics of the display unit in accordance with the color chart data outputted from the color chart output unit and the name of the color entered through the color name input unit.

Abstract: The present invention provides a method and system for generating reference signals that, when correlated with synchronization code signals or other components of broadcast TV signals, yield minimal sidelobes, produce large main peaks, and have minimal couplings to high frequency noise and low frequency disturbance signals. The present invention also provides a method and system for accurate position determination utilizing broadcast TV signals by employing reference signals with improved correlation characteristics of minimal sidelobes, minimal coupling to high frequency noise, minimal coupling to low frequency disturbance signals and a maximal main correlation peak.

Abstract: When a TS (Transport Stream) generator generates a TS, the TS is modulated by a signal modulator and outputted to a tuner set. In the tuner set, various noises generated by a noise source are added to an input signal, reception processing is performed, and then the resultant signal is outputted to a LVDS (Law Voltage Differential Signal) converter. The LVDS converter converts the input signal into a LVDS of the same format as TS, and outputs the LVDS to an error rate measuring device. The error rate measuring device find a difference between the generated TS and the inputted LVDS while adjusting a synchronization and outputs the difference to a personal computer. The personal computer compares the inputted difference with a predetermined BER (Bit Error Rate), and determines performance regarding the reception process of the tuner set based on the comparison result.

Abstract: A technique for managing the production, post-production and distribution of audio-visual projects permits accurate management of production values and thereby allow accurate and measurable reproduction and control. Test signal data is used to assist the operator in insuring the levels are set to the intended display characteristics in the event that factors such as creative lighting or applied effects affect the desired look of the scene. The test signal data may encompass elements that determine resolution, White level, Black level, Grey steps, Frequency response and linearity as well as sound parameters. Chroma channels may exhibit similar signals including a bar pattern that can be used to insure the best colorimetry is maintained. Standard signals may also improve compositing and cross media transfers without extraordinary efforts to match production values.

Abstract: A communication system (100) processes forward signals generated by headend equipment (105) and reverse signals generated by subscriber equipment (135). A communication medium (110, 120), such as fiber optic cable or coaxial cable, connects the headend equipment (105) and the subscriber equipment (135), and amplifiers (400) are positioned at various locations along the medium (110, 120) to amplify the forward and reverse signals. The amplifiers (400) include a dual forward/reverse test circuit (FIG. 6) having a forward test point (406) coupled to the forward signal, a reverse test point (408) coupled to the reverse signal, and a single directional coupler (404) connected to the forward test point (406), for providing the forward signal thereto, and to the reverse test point (408), for providing the reverse signal thereto.

Abstract: There is disclosed a system and method for the automated testing of digital television receivers. The automated test system comprises a digital video signal unit capable of sending a digital video test pattern to a digital television receiver. The digital video signal unit is capable of receiving from the digital television receiver a reconstructed digital video signal representing the digital video test pattern as displayed by the digital receiver television receiver. The automated test system comprises a test processing unit that is capable of comparing the digital video test pattern with the reconstructed digital video signal to determine the video quality of operation of the digital television receiver. The system and method of the present invention compares the digital video test pattern and the reconstructed digital video signal by 1) comparing the amount of jitter, and 2) comparing the signal to noise ratio, and 3) computing percentage similarity between an image block of each of the two video signals.

Abstract: The present invention relates to methods and apparatus for measuring the quality of video (e.g., television) signals. In particular, the methods and apparatus of the present invention allow for the measurement of various quality parameters of analog or digital video signals at a set-top terminal 10 or similar device, without the need for external test equipment. A video signal 14, which contains a test signal, is received at a decoder 20. The video signal 14 is decoded and temporarily stored in memory 40. A processor 30 associated with the decoder 20 and the memory 40 analyzes the test signal and calculates a quality parameter for the received video signal 14 based on the test signal. The quality measurements can also be accessed remotely and downloaded, for example, by a cable television provider at a cable television headend. The video quality measurement may include various indicators of end-to-end system performance, including the performance of the set-top terminal 10 or similar device.

Abstract: A graphical user interface is proposed for generating an interface signal with a target on a display aimed. An image sensor has an image plane on which an image of the display including characteristic points is formed, a point of the image formed at a predetermined position of the image plane corresponding to the target. A processor calculates the position of the target on the display relative to the characteristic points on the basis of the output of the image sensor including the information of the positions of the characteristic points. And the interface signal is generated with the position of the target calculated.

Abstract: A novel process of visual calibration of a computer display or the like in volves adjusting the appearance and relative appearance of targets and su targets displayed on the display. An objective method is provided for determining the precisely optimal brightness setting for CRT displays, which method is also applicable to the setting of the “Black Level” control on some FPDs. A precise method is provided to visually determine conformity of a display's tonality to a given standard tone curve, for example a gamma 1.8 curve, which is embodied in one of the preferred calibration target sets. The need to sense and therefore be able to control and to verify the correct gray balance of the entire tone scale of the display is met. The problem of verifying the similarity of the tone curve in the display profile and that of the actual calibration is solved.

Abstract: An image quality analysis method and an image quality analysis system for a display device are provided. The image quality analysis method and image quality analysis system provides a quantitative determination of image quality for display devices, thereby providing an objective and fair evaluation criterion.

Abstract: When a manufacturer or a user desires to adjust a Braun tube, it is required to display a test pattern satisfying setting conditions of display modes on the Braun tube. To set the display modes of the test pattern, a plurality of horizontal synchronizing signals and a vertical synchronizing signal are generated by a timer circuit for each field. Also, display modes (for example, shape, position, size, color and luminance) of a type of characters having the same shape are set in an OSD circuit to set the display modes of the test pattern composed of the characters having the same shape. Thereafter, a composite video signal of the test pattern satisfying the display modes is produced on the basis of the horizontal synchronizing signals and the vertical synchronizing signal in the OSD circuit, and the test pattern is displayed on the Braun tube according to the composite video signal.

Abstract: A picture quality diagnostics apparatus and method generates a human vision model response based on a human vision model for a test input video signal. Also objective measure maps for different impairment types are generated from the test input video signal. The objective measure maps are applied as masks to the human vision model response to produce objectively filtered subjective maps. The objectively filtered subjective maps are analyzed to give the respective proportions of the different objective impairment types contributing to perceptual impairment or difference for the test input video signal.

Abstract: Techniques for quantitatively assessing the visual quality of information displays are described. A group of flat panel displays are tested to produce quantitative visual test data to allow an assessment of the visual quality of each of the flat panel displays. In one aspect, eight key photometric indices of visual quality are produced. Additionally, composite indices composed to two or more individual photometric indices are provided.

Abstract: A self-testing video display device and method of use. A video display test program is stored in a video processing unit inside a video display device. The test program includes a plurality of video test patterns and is accessible by entering a “secret” keycode combination on a keypad of the video display device. The self-testing video display device allows a service center operator to evaluate a malfunctioned video display device at the user's location through telephone or internet. An end user may also use the video display test process to set up, evaluate, and calibrate the self-testing video display device at the user's location.

Abstract: For control and correction of deflection parameters especially of convergence, a grid pattern is displayed on the picture screen of a television device. For control of the convergence parameters and the evaluation of the correction values the crossing points of the grid pattern are marked by a cursor. The cursor is formed by at least one irregularity in the grid pattern being, regular otherwise. The irregularity may consist in an omission within the grid pattern like an interruption within one horizontal or vertical grid line. An image signal generator for the grid pattern with position cursor includes a raster generator, a grid generator, a cursor generator, and means for combining a grid signal from the grid generator and a cursor signal from the cursor generator so as to inhibit the grid signal corresponding to locations on the grid pattern where the position cursor is visible by an absence of display of portions of the grid pattern.

Abstract: The present invention relates to methods and apparatus for measuring the quality of video (e.g., television) signals. In particular, the methods and apparatus of the present invention allow for the measurement of various quality parameters of analog or digital video signals at a set-top terminal 10 or similar device, without the need for external test equipment. A video signal 14, which contains a test signal, is received at a decoder 20. The video signal 14 is decoded and temporarily stored in memory 40. A processor 30 associated with the decoder 20 and the memory 40 analyzes the test signal and calculates a quality parameter for the received video signal 14 based on the test signal. The quality measurements can also be accessed remotely and downloaded, for example, by a cable television provider at a cable television headend. The video quality measurement may include various indicators of end-to-end system performance, including the performance of the set-top terminal 10 or similar device.

Abstract: A test video sequence for testing quality loss in processed video. When video clips are transmitted, compressed/decompressed, or otherwise processed, measuring the loss of quality that occurs during processing can be improved by inserting specific types of overhead video data into the test video sequence before processing. When the processed test video sequence is compared to the pre-processed test video sequence, the overhead video data enables improvements in the comparison operation. In one embodiment, padded areas such as uniform-color frames are inserted at specified points to absorb some of the quality loss and/or to enable identification of starting and/or ending points of the video clips. In another embodiment, a special color bar is inserted before processing and used after processing to detect changes that should be corrected before comparing the video clips.

Abstract: A color-bar signal generation unit compatible with a plurality of television signal formats is provided. The color-bar signal generation unit in accordance with the present invention includes first, second, and third color-bar signal generators for generating a color-bar signal that represents a 16:9 aspect ratio color-bar test pattern, and a color-bar signal switch for switching outputs of the generators. The color-bar signal is structured to contain a 75% color-bar signal and 100% color-bar signals. The 75% color-bar signal represents a portion of the color-bar test pattern defined with an aspect ratio of 4:3 and serves as an NTSC color-bar signal. The 100% color-bar signals represent portions of the color-bar test pattern outside the portion with the aspect ratio of 4:3 and serve as components of an HD color-bar signal. Consequently, the color-bar signal can be used in common for the HD format stipulating the aspect ratio of 16:9 and the NTSC format stipulating the aspect ratio of 4:3.

Abstract: To maintain for hours a display with high image quality and fine quality in a projector and a display system including the same. Using correction data obtained in accordance with the need of a user, correction processing is performed on an inputted video signal to input the corrected signal into a liquid crystal panel, thereby keeping good display characteristics.