Dr. Francesco Zotta Profile

Dr. Francesco Zotta

at Philips Research Labs

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 28 May 2004 Paper

A directional edge-sensitive image interpolator

Francesco Zotta, Paola Carrai, Giulio Ferretti, Giovanni Ramponi

Proceedings Volume 5298, (2004) https://doi.org/10.1117/12.525774

KEYWORDS: Image processing, RGB color model, Linear filtering, Image analysis, Video, Nonlinear filtering, Visualization, Image filtering, Distortion, LCDs

Read Abstract +

One of the most common tasks in image processing is to change the resolution of a picture. In this paper we present a new nonlinear method for interpolating digital images, which is particulary effective in the rendition of edges in natural and synthetic input. The algorithm is spatial variant and applies the warped distance (WaDi) concept, generalizing the technique to a two dimensional problem, which requires a non-separable approach. It consists of three separate stages. First of all the original image is analyzed to detect its local gradient characteristics; then edge asymmetry is computed at each output pixel position according to the WaDi technique, and it is compared to a reference sigmoidal edge; the local edge asymmetry straightforwardly determines the warping factor which is applied to the bi-dimensional space of the image; eventually the actual interpolation is performed applying a conventional interpolator such as the linear or bicubic ones. The resulting interpolation method gives an output which does not present the usual blurring typical of images processed with linear interpolators and at the same time preserves the regularity of resized edges avoiding jagging artifacts. Moreover, the method adapts for zooming by a rational scaling factor. The paper is organized as follows. In the first section we introduce the problem of zooming digital images; the second section describes the state of the art; we continue describing the proposed method; then we propose a possible extension of the method to process color images; we end showing some examples of images interpolated with our method, and comparing these results with what can be obtained zooming the same input with other interpolators.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years