Science / Spiders / Point-Spread Function: the kernel in the superposition integral (convolution product) that expresses the effect of a linear optical system in the formation of an image of an object. Point spread function and transfer function form Fourier pairs. In bright-field electron microscopy, the point-spread function is the Fourier transform of the contrast transfer function.
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Function Noun Synonyms: purpose, aim, role or r“le, raison d'ˆtre, responsibility, mission, charge, concern, business, province, duty, job, occupation, work, office, task, chore, assignment, commission, activity
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Science / Tides and Currents / Harmonic Function: In its simplest form, a quantity that varies as the cosine of an angle that increases uniformly with time. It may be expressed by the formula: y = A cos at in which y is a function of time (t), A is a MORE
Entertainment / Photography / MTF (Modulation Transfer Function): A comparison of contrast between a test chart and the reproduced image. One of the measurements of lens performance used in the manufacturing process. MORE
Entertainment / Literature / Grammatical Function: A category for words in inflected languages--typical examples include aspect, mood, and tense for verbs, person and case for pronouns, case and definiteness for articles, and number, case, and gender MORE