摘要:
A video test system is provided with a circular buffer to capture a video input sequence in response to a trigger, and a test generator output to generate a video test sequence based upon the captured video test sequence. The system may be implemented using a single instrument, or a combination of instruments, such as video waveform monitors and video signal generators. A method is also provided for generating video test sequences based upon captured video sequences.
摘要:
A Wireless Regional Area Network (WRAN) receiver includes a tuner for tuning to one of a number of channels, and a broadcast ATSC (Advanced Television Systems Committee) signal detector. The tuner is calibrated as a function of a received ATSC signal. The broadcast ATSC signal detector can be a coherent or a non-coherent ATSC signal detector.
摘要:
The invention is directed to generic spectral modeling techniques applicable to a variety of imaging devices. A generic spectral model may include a general channel model capable of modeling spectral characteristics of imaging devices and a look-up table (LUT) capable of compensating for cross-channel interaction and possibly other characteristics that are difficult to model, such as non-linear characteristics of imaging devices. In this way, the generic spectral model includes aspects of both a conventional physical model and a conventional brute force model. Digital values, i.e., pixel counts, of each channel of an imaging device are adjusted by the LUT of the generic spectral model to include cross-channel interaction. The channel model then accurately predicts spectral emissions for each channel of the imaging device based on the adjusted digital values. The generic spectral model converts the predicted spectral emissions to a device-independent color space.
摘要:
Providing color management includes receiving measurements of the intensity of colors. A light source generates light beams to yield the colors, where the light beams are generated in accordance to image data to create an image. A target color value is established. A duty cycle sequence operable to control the light source is selected (120) in accordance with the measurements and the target color value. Current levels for currents provided to the light source are selected (128) in accordance with the duty cycle sequence and the target color value.
摘要:
Die Erfindung betrifft ein Bildwiedergabegerät (1) mit einem Frontrahmen (2) und mit einer mit einem Sensor (9) versehenen Sensoreinrichtung (6), wobei der Sensor (9) zur Erfassung der Leuchtdichte und/oder des Farborts eines auf einer Anzeige (7) des Bildwiedergabegerätes (1) darstellbaren Bildes vorgesehen ist. Zur Erfassung der Leuchtdichte sind Bildwiedergabegeräte mit einem Sensorträger bekannt, welcher in einer Ruheposition in einem für einen Betrachter nicht sichtbaren Bereich in einer Ausnehmung eines Rahmens eines Flachbildschirms angeordnet ist. Durch geeignete Antriebsmittel ist der Sensorträger von dieser Ruheposition in eine Position zur Erfassung der Leuchtdichte ausschwenkbar. Die Fertigung eines derartigen Bildwiedergabegerätes ist aufwendig. Ferner sind die Antriebsmittel störanfällig, wodurch eine kontinuierliche und störungsfreie Erfassung der Leuchtdichten nicht möglich ist. Es werden Maßnahmen vorgeschlagen, welche diese Nachteile vermeiden.
摘要:
A system comprising: a) an OLED display having light-emitting elements having perceptible brightness uniformity variations less than a threshold value when driven with a common signal; b) an imager with light-sensitive sensor elements having variable light exposure levels and sensitive to the light emitted by the light-emitting elements, where the sensor elements are not capable of detecting brightness uniformity variations less than the threshold value at a first light exposure level; c) optical elements arranged so that the light-sensitive sensor elements are exposed to the light-emitting elements of the OLED display; and d) a controller programmed to control the OLED display and cause the light-emitting elements to illuminate and the imager to acquire images of the illuminated light-emitting elements in the OLED display at least the first and a different second light exposure level.
摘要:
Information about variation adjustments made to TVs during assembly is entered into a database (16) after each adjustment, to facilitate monitoring and reporting of the assembly process, so that corrective action when appropriate can be taken more quickly.
摘要:
The present invention relates to a method and system for estimating the quality of encoded video data without referring to the source data. The system is configured to decode compressed video data using an MPEG/H.263 decoder to produce decompressed video data. The decoded (16) data is subject to a discrete cosine transform (DCT) to produce a set of DCT coefficients of the decompressed video data is determined to be intra-coded. Meanwhile, the quantization matrix including a quantization step size for each block of the decompressedvideo data are extracted (24). Following this, statistical properties of the DCT coefficients are estimated (26) from the decoded video. Then, an average quantization error for both AC and DC coefficients is determined (28) using information regarding the quantization and the statistical properties. Finally, this estimated quantization error is used for in computing (28) a peak signal to noise ratio (PSNR).