Abstract

The block transform-DCT- is commonly used for many video, image, and audio coding standards, such as MPEG and JPEG. However, DCT causes “blocking artifacts” at high compression ratio. Recently, some classes of new transfroms for the reduction of blocking effects have been introduce such as the lapped orthogonal transforms (LOTs or LOT), GenLOTS (Generalized LOTs), VLLOTS (Variable Length LOTs)...Those LOTS, which are based on DCT, reduce blocking effect, but do not remove it perfecty. The paper will introduce a new class of LOTs, which is called NLOTs. The NLOTS remove perfectly “blocking artifacts” and have the same computational complexity like the LOTs.