Overlapping Block Transform For Image Coding Preserving Equal Number Of Samples And Coefficients

H. Schiller

doi:10.1117/12.969033

25 October 1988 Overlapping Block Transform For Image Coding Preserving Equal Number Of Samples And Coefficients

H. Schiller

Proceedings Volume 1001, Visual Communications and Image Processing '88: Third in a Series; (1988) https://doi.org/10.1117/12.969033
Event: Visual Communications and Image Processing III, 1988, Cambridge, MA, United States

Abstract

An approach to transform coding of images is presented, which uses overlapping blocks without increasing the number of coefficients. This is achieved by subsampling in the frequency domain, thus causing spatial domain aliasing in each block. This spatial domain aliasing is however cancelled out by an overlapping addition of the backward transform output of neighboring blocks. Conditions are stated, under which this aliasing cancellation property holds even when a spatial window function is incorporated into the transform. By the design of the window function, block boundary artefacts typical for conventional transform coding can be completely avoided. The application of 2-dimensional overlapping block transform (2D-OBT) to picture coding is examined, the nature and visibility of quantization errors in the case of lossy coding are analyzed. The incorporation of 2D-OBT in a low bitrate hybrid image sequence coding environment is described. Simulation results are presented, showing the achievable picture quality at 64 kBit/s using 2D-OBT as compared to DCT.

Citation Download Citation

H. Schiller "Overlapping Block Transform For Image Coding Preserving Equal Number Of Samples And Coefficients", Proc. SPIE 1001, Visual Communications and Image Processing '88: Third in a Series, (25 October 1988); https://doi.org/10.1117/12.969033

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