- Line pair
philately, a line pair is a coil pairof postage stamps bearing an inked line between the two stamps. There are at least two kinds of these.
A guide line pair has a
guide linebetween the stamps. Since the guide lines are deliberately incised into the plate, they will generally be sharp and clear.
A joint line pair has a
joint linebetween the stamps, deriving fromthe seam in the cylindrical plate used to print the stamps. These lines are somewhat smeared in appearance.
In image processing
image processing, the description of a line pairis this: on a test pattern consisting of closely spaced black parallel lines on a white background, a line pairis one black line together with the white space on one side of it. When photographers say "lines of resolution", they mean line pairs. In television and video, one line pair equals two TV lines or pixels, of resolution.
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