Title :
Simplified DCT-lifting-based reversible lapped transforms using parallel processing of two same type lapped transforms
Author :
Suzuki, Takumi ; Ikehara, Masaaki
Author_Institution :
Fac. of EIS, Univ. of Tsukuba Tsukuba, Tsukuba, Japan
Abstract :
We present a realization of reversible lapped transforms (RevLTs) with simplified implementations, which are constructed by DCT and DST matrices, adders, and bit-shifters, for lossy-to-lossless image coding in this paper. Each DCT or DST matrix is directly used to each lifting coefficient block and it is called DCT-lifting structure. The structure is obtained by considering parallel processing of two `same´ type LTs and using DCT-lifting factorizations as our previous work. Furthermore, the Hadamard transform and scaling parts in the RevLTs are effectively implemented by extending 2D non-separable lifting structures derived from lifting-based lapped transform (L-LT) used for JPEG XR, the newest image coding standard. As a result, the proposed RevLTs achieve not only simplified implementations with any block size, but also comparable lossy-to-lossless image coding performance to the conventional RevLTs.
Keywords :
Hadamard transforms; discrete cosine transforms; image coding; matrix decomposition; parallel processing; DCT matrix; DCT-lifting factorization; DCT-lifting structure; DST matrix; Hadamard transform; JPEG XR image coding standard; RevLT; discrete cosine transforms; discrete sine transform; lifting coefficient block; lossy-to-lossless image coding; parallel processing; reversible lapped transforms; simplified DCT-lifting-based reversible lapped transforms; Discrete cosine transforms; Encoding; Image coding; Standards; Transform coding; Vectors; DCT; DST; lapped transform (LT); lifting structure; lossy-to-lossless image coding;
Conference_Titel :
Image Processing (ICIP), 2014 IEEE International Conference on
Conference_Location :
Paris
DOI :
10.1109/ICIP.2014.7026130