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- Number of terms: 20560
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Tektronix provides test and measurement instruments, solutions and services for the computer, semiconductor, military/aerospace, consumer electronics and education industries worldwide.
DCT coefficients before Dequantization. A variable length coded representation of quantized DCT coefficients is stored as part of the compressed video bit stream.
Industry:Software
QuickTime is a software platform from Apple that allows integration of audio visual data into software applications. It supports various algorithms through its built-in image compression manager. The algorithms supported include CinePak, JPEG, and MPEG. QuickTime files have the file extension “.mov.”
Industry:Software
Apple’s multimedia playback environment for Microsoft™ Windows operating system. You use QuickTime for Windows by installing several drivers and libraries on your hard disk.
Industry:Software
A) An additive colour space with colorimetric coordinates based on red, green, and blue stimuli or primaries. colour values are negative in certain areas outside the gamut defined by the R, G, B primaries.
The R, G, B values used are intensities. b) The three linear video signals carrying respectively the red, the green, and the blue information. By convention, the unprimed symbols signify that there is a linear relationship between the luminance in each spectral region and the corresponding video signal. The spectral composition of the luminance forming each of these signals is one of the specifications required of the video system. The recently adopted CCIR Rec 709 reflects worldwide agreement on the current definition of R, G, B primary colors. CCIR Rec 709 identifies this as an interim agreement to be superseded by preferred primary colours encompassing a wider colour gamut as soon as the technologies and practises permit. c) The colorimetric coordinates defined by thee nonlinear video signals carrying respectively the red, the green, and the blue information. By convention the primed symbols signify that there has been a nonlinear transformation of the video signals vs. luminance, relative, scene, with its resulting modification of the opto-electric transfer function.
Industry:Software
A common source of image artefacts that appear as black spots on the screen, either stationary or moving around. Several things can cause pixel drop out, such as the ADC not digitising the video correctly or pixel timing being incorrect any where in the system.
Industry:Software
Local TV broadcasters’ right to negotiate a carriage fee with local cable operators, as provided in 1992 Cable Act.
Industry:Software
A device for converting signals from one standard to another. Converting between different colour schemes with the same scanning structure is called transcoding. Converting between different scanning structures requires line and field interpolation, which usually introduces artifacts. Standards conversion between 525 scanning line and 625 scanning line signals is performed regularly. Conversion from DHEP to either NTSC or a receiver-compatible ATV system will require standards conversion. It may seem that it is more difficult to convert from 1125 scanning lines to 525 than from 1050 to 525, but in a pre-filtering converter, the difference, if any, may not be large. For dealing with the field-rate difference (HDEP 60 and NTSC 59.94), some DHEP to NTSC conversions are performed by slowing the HDEP recorders to 59.94-field playback. Others are performed through standards converters that periodically omit fields.
Industry:Software
Three coloured phosphor dots on the faceplate of a tri-color CRT.
Some tri-color CRTs use vertical stripes of different colour phosphors or vertically oriented oblong dots. These dots or stripes are the ultimate determinants of maximum horizontal resolution. When the dots are round, they are also the maximum determinants of vertical resolution. The finer the dot pitch, the higher the resolution, since it is not possible to reduce the size of a black-and-white pixel below the size of one triad. Triad spacing also cannot be optimised for all numbers of scanning lines. Thus, a tube optimised for 1125 scanning lines will not yield optimum performance with a signal of 1050 scanning lines, or vice versa. Neither black-and-white CRTs nor the three single-color CRTs used in most projection TV sets suffer from these limitations as their faceplates are uniformly covered with a layer of phosphor; resolution is ultimately determined by the size of the electron beam and the projection optics. Picture tubes with striped apertures can deal effectively with multiple scanning rates, but still restrict horizontal resolution to the width of three stripes.
Industry:Software
Picture element that has different vertical and horizontal sample spacing. Rectangular pixels are usually used by consumer video equipment and video conferencing.
Industry:Software
