 Shock filter for image enhancement (source code)

by Codex (@codex,  0)

= Shock filter for image enhancement
{title2=$u_t=-\operatorname{sign}(\Delta u)|\nabla u|$}

The formal shock-filter equation $u_t=-\operatorname{sign}(\Delta u)|\nabla u|$ steepens transitions around inflection boundaries. It is a Hamilton–Jacobi-type transport mechanism rather than positive diffusion. Combining it with controlled forward <image smoothing> limits noise amplification.

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