This paper presents a real-time multi-directional 2D fast wavelet transform. As a real-time implementation of wavelet, small pixel windows in raster scan order are sequentially used as inputs to the transform instead of full image frame. This approach is corresponding to a recent image sensor releasing image pixels in line-by-line scanning order. The proposed method has high locality property so as to achieve low-latency real-time implementation adequate for recent mobile highly cost-effective application and it uses multi-directional decomposition which enables the transform to reduce the directional artifacts often occurring in conventional two-directional separable decomposition wavelet. As a possible application of the proposed wavelet, denoised sharpening algorithm was devised and the result is presented, representing the enhancement of directional and blocking artifacts problem.

Date Published: 24 January 2012
PDF: 7 pages
Proc. SPIE 8299, Digital Photography VIII, 82990T (24 January 2012); doi: 10.1117/12.909562

Published in SPIE Proceedings Vol. 8299:
Digital Photography VIII
Sebastiano Battiato; Brian G. Rodricks; Nitin Sampat; Francisco H. Imai; Feng Xiao, Editor(s)