2-D Large Inverse Transform (16×16, 32×32) for HEVC (High Efficiency Video Coding)

This paper proposes a 16×16 and 32×32 inverse transform architecture for HEVC (High Efficiency Video Coding). HEVC large transform of 16×16 and 32×32 suffers from huge computational complexity. To resolve this problem, we proposed a new large inverse transform architecture based on hardware reuse. The processing element is optimized by exploiting fully recursive and regular butterfly structure. To achieve low area, the processing element is implemented by shifters and adders without multiplier. Implementation of the proposed 2-D inverse transform architecture in 0.18 ㎛ technology shows about 300 ㎒ frequency and 287 Kgates area, which can process 4K (3840×2160)@ 30 fps image.