Scanned JPEG Blur/Shake Tuner (LocalStorage Presets)

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Preset

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Thresholds

Downscale max dimension (px)

Edge percentile (0–1)

Blur threshold (sharpness <)

Shake threshold (motionScore >)

Low-contrast threshold (edgeDensity <)

Tips:

sharpness is Variance of Laplacian on edges — higher means sharper.
motionScore estimates directionality of gradients — higher can indicate motion blur (shake).
edgeDensity helps detect blank or very faint pages.

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Sharpness (Var(Laplacian) on edges)
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Motion score (directionality)
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Edge density
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Downscaled size
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