Selective sharpness enhancement of corrupted old film sequences by coupled nonlinear reaction-diffusion time-evolution

Takahiro Saito; Kentarou Yashiro; Jun Satsumabayashi; Takashi Komatsu

doi:10.1117/12.453130

4 January 2002 Selective sharpness enhancement of corrupted old film sequences by coupled nonlinear reaction-diffusion time-evolution

Takahiro Saito, Kentarou Yashiro, Jun Satsumabayashi, Takashi Komatsu

Author Affiliations +

Proceedings Volume 4671, Visual Communications and Image Processing 2002; (2002) https://doi.org/10.1117/12.453130
Event: Electronic Imaging, 2002, San Jose, California, United States

Abstract

In old movie film, most of sharp brightness transitions have been blurred, and film materials are often corrupted by several distortions such as blotches. To restore original edge sharpness without augmenting visibility of such distortions, first we characterize such distortion areas, repair them and then sharpen only blurred edges selectively. This paper presents a locally-adaptive sharpening method based on the coupled nonlinear reaction-diffusion time-evolution equipped with a second-order nonlinear smoothing term, a reaction term and an overshooting term. The overshooting term adds an overshoot only to the blurred edges. The coupled nonlinear reaction-diffusion method utilizes information about local image contents and the characterized film distortions, to control the degree of the second-order smoothing and the magnitude of the overshoot to be added. Our method sharpens blurred edges selectively much better than our previously presented adaptive peaking method. Our method, of course, is applicable to sharpness enhancement of general blurred images.

Citation Download Citation

Takahiro Saito, Kentarou Yashiro, Jun Satsumabayashi, and Takashi Komatsu "Selective sharpness enhancement of corrupted old film sequences by coupled nonlinear reaction-diffusion time-evolution", Proc. SPIE 4671, Visual Communications and Image Processing 2002, (4 January 2002); https://doi.org/10.1117/12.453130

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available