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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.
A) Source, coded, or reconstructed image data. A source or reconstructed picture consists of three rectangular matrices of 8-bit numbers representing the luminance and two chrominance signals. For progressive video, a picture is identical to a frame, while for interlaced video, a picture can refer to a frame, the top field, or the bottom field of the frame depending on the context. b) In general, the term “picture” covers a coded entity. A picture can either be a frame or a field. It is possible to change dynamically between frame coding and field coding from frame to frame. Frame coding is preferred when a lot of details, but little motion is present, and field coding is best for fast movements. It is also important to realise that when the coded material originates from film, the two fields cover the exact same time, but when the source material comes from a video camera, the two fields relate to different moments.
Industry:Software
In tapes consisting of oriented, acicular particles, this ratio is an indication of the degree of particle orientation.
Theoretically, the ratio varies from 0.5 for randomly oriented particles to 1.0 for completely oriented particles. In practice, oriented tapes typically have ratios between 0.70 and 0.76.
Industry:Software
A) A type of mathematical model used to represent curves. They are usually displayed as polylines with a large number of very small sides.
The importance of splines is that they give very smooth curves for a relatively small number of points. b) In wooden ships, the curved skeleton of a hull is built by attaching bendable strips of wood to small, fixed, and angled blocks of wood. The strips are splines. In computer graphic splines, the blocks of wood are called control points. In computer graphics, curved lines are always visualised by drawing many short vectors. However, since each vector requires a fair amount of storage, curves are often stored in terms of their control points; whenever the curve is needed, the spline is recreated. Another advantage of storing splines as curves is the ease with which a spline curve is manipulated by moving its control points. Instead of moving the curve’s vectors one at a time, a large section of the curve is moved by dragging its control point. Splines convert discontinuity into smoothness. These properties make splines very useful in animation. When we create a keyframe for path animation, the object’s position becomes a control point for a spline that defines the entire path for all the in-between frames as well. This allows us to get smooth motion between all the keyframes, and avoid instantaneous (single frame) changes of direction.
Such changes would be highly unrealistic and could never yield satisfying animation. Another tremendous advantage of splines is that they are resolution independent. Magnifying and then redrawing a shape that is represented by a spline does not reveal the short vectors that represent the curve on the screen, because these vectors are recalculated to take into account the new magnification. Spline represented objects can also be easily rotated or skewed in 3D, again with no loss in clarity. So called “vector- based” systems make use of these features by representing fonts and shapes with splines, rather than the traditional bitmap. Bitmap systems, on the other hand, cannot represent or manipulate shapes nearly as handily.
Industry:Software
Exclusively on the AVC series, an operator may choose automatic transitions that are not linear, that is that do not have the same rate as they progress. One may choose logarithmic, starting rapidly and finishing slowly; exponential, starting slowly and finishing rapidly; or sinusoidal, starting and finishing slowly but fast in the middle.
Industry:Software
An ATV proponent issued a patent for a data compression transmission scheme for HD signals. The Osborne compression system is said to allow channel-compatible but not receiver-compatible HDTV.
Industry:Software
Sequence of pictures, that all are frame pictures with frame DCT coding.
Industry:Software
A table listing the providers of each service in a transport stream. The SDT contains data describing the services in the system, i.e., includes names of services, the service provider, etc.
Industry:Software
A version of TIFF file format used by Kodak digital cameras to store non-image data with many different types of image data.
Industry:Software
The set of video coding algorithms that precedes the actual MPEG-4 video coding specification.
Industry:Software
The smallest area of a television picture capable of being delineated by an electric signal passed through the system or part thereof. Note: It has three important properties, namely Pv, the vertical height of the picture element; Ph, the horizontal length of the picture element; and Pa, the aspect ratio of the picture element. In an analogue system Pv = 1/N, where N is the number of active scanning lines in the raster, Ph = trA/tc, where tr is the average value of the rise and delay times (10% to 90%) of the most rapid transition that can pass through the system or part thereof, tc is the duration of the part of a scanning line that carries picture information, and A is the aspect ratio of the picture.
Industry:Software
