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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.
The (subjective) process in measuring the quality of an image or video sequence as it appears to humans. Humans find certain types of errors (image distortions) to be more acceptable than others.
In video coding, one is often trying to maximize the subjective quality of the video produced by the coding algorithm, which is often quite different than the mathematical quality (measured, for example, by the peak signal-tonoise ratio or PSNR).
Industry:Software
On the characteristic curve for a photographic material (the plot of density vs. log exposure) that portion representing nonlinear response at the higher densities. For the electronic relationship of a positive video image to the shoulder of photographic negatives.
Industry:Software
The force, usually in gm, required to initiate and/or propagate a tear in a specially shaped specimen of tape or base film.
Industry:Software
a) A common filter artifact, manifesting itself in television pictures as ghost-like images of sharp edges. b) An oscillatory transient occurring in the output of a system as a result of a sudden change in input. Results in close-spaced multiple reflections, particularly noticeable when observing test patterns, equivalent square waves, or any fixed objects whose reproduction requires frequency components approximating the cutoff of the system.
Industry:Software
Term for the technique of sub-sampling each NTSC pixel into three sub-pixels used in the HD-NTSC ATV scheme.
Industry:Software
The integration of video coding and channel coding to communicate video over a packetized communication channel. Usually, these techniques are designed to work in the presence of high packet jitter and packet loss.
Industry:Software
a) The process of converting a continuous analog input into a set of discrete output levels. b) A process in which the continuous range of values of an input signal is divided into non-overlapping subranges, and a discrete value of the output is uniquely assigned to each subrange. Whenever the signal value falls within a given subrange, the output has the corresponding discrete value.
Industry:Software
A film process using 70 mm (65 mm in the camera) film at 60 frames per second. It seems an ideal film production format (expense considerations aside) for transfer to ATV and has been demonstrated as such.
Industry:Software
