Algorithm for fractional multiple image enlargement based on all phase DCT

Yuqing He; Zhengxin Hou; Chengyou Wang

doi:10.1117/12.757247

29 November 2007 Algorithm for fractional multiple image enlargement based on all phase DCT

Yuqing He, Zhengxin Hou, Chengyou Wang

Proceedings Volume 6833, Electronic Imaging and Multimedia Technology V; 68332U (2007) https://doi.org/10.1117/12.757247
Event: Photonics Asia 2007, 2007, Beijing, China

Abstract

Image enlargement technique is widely used in image processing and video format transforming. This paper proposes an algorithm for fractional multiple image enlargement based on All Phase Discrete Cosine Transform (APDCT) interpolation. The All Phase Digital Filter (APDF) is a new type of linear phase filter. For a data vector with a length of N obtained by blocking a signal, there are N different phase data blocks that include the same sampling point. Through taking the mean of the N values as the filtering output, the APDF can eliminate different meanings of the orthogonal transform filtering values of those data vectors and thereby the block effect. According to this idea, this paper deduces the formula of two-dimension APDCT filter. As a good integration of Discrete Cosine Transform (DCT) and all phase idea, a family of separable interpolation kernel, which is constructed by cosine function, is put forward. Look-up method is then discussed for real time image enlargement. The objective and subjective experiments show that better image quality is obtained by using interpolation kernel proposed than using 6*6 cubic interpolation kernel.

Citation Download Citation

Yuqing He, Zhengxin Hou, and Chengyou Wang "Algorithm for fractional multiple image enlargement based on all phase DCT", Proc. SPIE 6833, Electronic Imaging and Multimedia Technology V, 68332U (29 November 2007); https://doi.org/10.1117/12.757247

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