isophote


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isophote

(ˈaɪsəˌfəʊt)
n
(Astronomy) astronomy a line on a diagram or image of a galaxy, nebula, or other celestial object joining points of equal surface brightness
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Those with a well-defined internal rotation have "disky" isophotes, while those with motions resembling a random swarm of bees have "boxy" isophote profiles.
The diffusion intensity is high when the curvature is large and decreases along with the isophote furtherly smoothing.
Let the unit coordinate vectors in the O-xy system be i and j, then, any point in the space could be expressed by a vector r=xi+yj, which becomes r=[xi]p+[eta]q in the O-[xi][eta] system, where [xi] and n are the two components in the isophote and gradient directions respectively, and p and q are the two orthogonal unit vectors:
The isophote direction, denoted by [nabla] [perpendicular to] u is normal to the gradient [nabla] u.
CANIZARES: X-ray isophote shapes and the mass of NGC 3923.
By measuring the phase of Venus using such isophote contours on all three dates, I found a discrepancy of about 2 percent from prediction.
Morse and Schwartzwald [22] considered smoothing the isophotes of the HR ima ge to reduce the undesirable artifacts.
Cadmus Fashion automatically generates color maps that enable users to compare and analyze curvature, deviation, contours, isophotes and environment.