Sciweavers

Share
ICMCS
2006
IEEE

Nonlinearly-Adapted Lapped Transforms for Intra-Frame Coding

11 years 7 months ago
Nonlinearly-Adapted Lapped Transforms for Intra-Frame Coding
The use of block transforms for coding intra-frames in video coding may preclude higher coding performance due to residual correlation across block boundaries and insufficient energy compaction, which translates into unrealized rate-distortion gains. Subjectively, the occurrence of blocking artifacts is common. Post-filters and lapped transforms offer good solutions to these problems. Lapped transforms offer a more general framework which can incorporate coordinated pre- and post-filtering operations. Most common are fixed lapped transforms (such as lapped orthogonal transforms), and also transforms with adaptive basis function length. In contrast, in this paper we determine a lapped transform that non-linearly adapts its basis functions to local image statistics and the quantization regime. This transform was incorporated into the H.264/AVC codec, and its performance evaluated. As a result, significant rate-distortion gains of up to 0.45 dB (average 0.35dB) PSNR were obtained co...
Dan Lelescu
Added 11 Jun 2010
Updated 11 Jun 2010
Type Conference
Year 2006
Where ICMCS
Authors Dan Lelescu
Comments (0)
books