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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.
Applications where JPEG compression or decompression is speeded up to be able to process 25 or 30 frames per second and is applied real-time to video. Even though a video signal is being processed, each field is still individually processed.
Industry:Software
The movement between keyframes, changed with the Path soft key. There are five types of paths:
: BRK (Break) modifies Smooth motion by decelerating speed to zero at each keyframe (a break), then starting again.
: IGN (Ignore) allows selected parameter values to be ignored when calculating motion path.
: SMTH (Smooth) provides a curved path between keyframes. The effect speeds up gradually as it leaves the first keyframe, and slows down gradually until it reached the last keyframe.
: LIN (Linear) provides a constant rate of change between keyframes, with an abrupt change at each keyframe. Linear uses the shortest distance between two points to travel from one keyframe to another.
: HOLD stops all motion between keyframes. The result of the motion shows when the next keyframe appears. HOLD looks like a video “cut,” from one keyframe to the next.
Industry:Software
Editing using media like tape, in which material must be accessed in order (e.g., to access scene 5 from the beginning of the tape, one must proceed from scene 1 through scene 4).
See Nonlinear Editing.
Industry:Software
A successful motion path has two components: geometry and timing. The geometry is created by choosing keyframes. The timing of the path is more complex, and can be affected by the geometry.
Intuitively, the timing of a path is simply the speed of motion of the object as it moves along the path. Since PictureMaker starts with keyframes and creates in-between positions, PictureMaker determines the velocity by deciding how many in-betweens to place between each keyframe (and where to place them). Several methods can be used to determine velocity along the path. a) Place frame evenly between all keyframes. Closely placed keyframes will correspond with slow moving parts of the path.
b) Specify a relative velocity at selected keyframes, and specify correspondences between any keyframe and a frame in the final animation.
Industry:Software
A modern method of addressing the display memory.
The display memory (in the IBM PC world) was originally located in a 128-Kbyte area from A000:0 through BFFF:F, too small for today’s display systems with multi-megabyte memories. Linear addressing allows the display memory to be addressed in upper memory, where a large contiguous area is set aside for it.
Industry:Software
Distortions which are independent of signal amplitude.
These distortions occur as a result of the system’s inability to uniformly transfer amplitude and phase characteristics at all frequencies.
When fast signal components such as transitions and high frequency chrominance are affected differently than slower line-rate or field-rate information, linear distortions are probably present. These distortions are more commonly caused by imperfect transfer characteristics in the signal path. However linear distortions can also be externally introduced. Signals such as power-line hum can couple into the video signal and manifest themselves as distortions.
Industry:Software
A major shift in the quality of a television picture in the presence of motion that is so jarring to the viewer that the system might actually appear better if it had continuously lower quality, rather than jumping from high-quality static image to a lower quality dynamic one.
Industry:Software
a) A term given to a key which contains soft edges and information at many different luminance levels. This is the ability of the keyer to key many levels linearly and means the keyer has a gain close to one. b) A process for the selective overlay of one video image upon another, as through chroma key. Control of the ratio of foreground to background is determined by the specifications derived from luminance information, and provided in the linear key data. Ratios to be applied are carried for each picture element in the alpha channel. The process permits realistic rendering of semi-transparent objects.
Industry:Software
