Robust Learning of 2-D Separable Transforms for Next-Generation Video Coding

With the simplicity of its application together with compression efficiency, the Discrete Cosine Transform(DCT) plays a vital role in the development of video compression standards. For next-generation video coding, a new set of 2-D separable transforms has emerged as a candidate to replace the DCT. These separable transforms are learned from residuals of each intra prediction mode; hence termed as Mode dependent- directional transforms (MDDT). MDDT uses the Karhunen-Loeve Transform (KLT) to create sets of separable transforms from training data. Since the residuals after intra prediction have some structural similarities, transforms utilizing these correlations improve coding efficiency. However, the KLT is the optimal approach only if the data has a Gaussian distribution without outliers. Due to the nature of the least-square norm, outliers can arbitrarily affect the directions of the KLT components. In this paper, we will address robust learning of separable transforms by enforci...

• Type: Journal
• Year: 2011
• Where: DCC
• Authors: Osman Gokhan Sezer, Robert A. Cohen, Anthony Vetro
• Keywords: Computer Graphics, DCC 2011, Intra, Intra Prediction, Separable Transforms