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I came across this "texture analysis" technique in a paper called "Identifying structural complexity in aeromagnetic data: An image analysis approach to greenfields gold exploration" by E. Holden et al. and I couldn't really find the meaning of whatever this is anywhere.

context: "In this paper, we detect edges (i.e., magnetic discontinuities) by firstly enhancing local magnetic variations using texture analysis and then finding ridges within the texture analysis outputs using a contrast-invariant line detection technique. Finally, the texture ridges are identified and vectorised."

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A contrast-invariant function is one that yields the same output before or after scaling intensities (i.e. increasing or decreasing contrast). For example, the function $g$ is contrast invariant if

$$g(f) = g(Cf)\;,$$

given an image $f$ and a positive constant $C$ (some contrast-invariant line detection algorithms might also yield the same results if $C$ is negative, but obviously not if it is zero).

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