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If f:D->Y is a map (a.k.a. function, transformation, etc.) over a domain D, then the

**image**of f, also called the range of D under f, is defined as the set of all values that ...An

**image**of an object obtained by reflecting it in a mirror so that the signs of one of its coordinates are reversed.Let f:A->B be a map between sets A and B. Let Y subset= B. Then the preimage of Y under f is denoted by f^(-1)(Y), and is the set of all elements of A that map to elements in ...

A two-dimensional generalization of the Haar transform which is used for the compression of

**astronomical**images. The algorithm consists of dividing the 2^N×2^N**image**into ...A deconvolution algorithm (sometimes abbreviated MEM) which functions by minimizing a smoothness function ("entropy") in an

**image**. Maximum entropy is also called the ...The Herschel is the heptomino illustrated above which is shaped like the

**astronomical**symbol for Saturn. It was misnamed by early investigators of the game of life who ...The inversion of a convolution equation, i.e., the solution for f of an equation of the form f*g=h+epsilon, given g and h, where epsilon is the noise and * denotes the ...

The Gall orthographic projection is a cylindrical equal-area projection with standard parallel of 45 degrees.

Pogson's ratio is the constant 100^(1/5)=10^(2/5)=2.511886431... (OEIS A189824) appearing in the definition of the

**astronomical**magnitude (brightness) scale. This scale is ...A "squashed" spheroid for which the equatorial radius a is greater than the polar radius c, so a>c (called an oblate ellipsoid by Tietze 1965, p. 27). An oblate spheroid is a ...

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