Sharpness Estimation for Document and Scene Images

Abstract

Images of document pages have different characteristics
than images of natural scenes, and so the
sharpness measures developed for natural scene images
do not necessarily extend to document images
primarily composed of text. We present an efficient
and simple method for effectively estimating the sharpness/
blurriness of document images that also performs
well on natural scenes. Our method can be used to
predict the sharpness in scenarios where images are
blurred due to camera-motion (or hand-shake), defocus,
or inherent properties of the imaging system. The
proposed method outperforms the perceptually-based,
no-reference sharpness work of [1] and [4], which was
shown to perform better than 14 other no-reference
sharpness measures on the LIVE dataset.