In this paper, a new approximate discrete cosine transform (DCT) architecture for an H.265/HEVC video compression codec is proposed. In order to reduce the computational complexity, a conﬁguration of basic elements by 0, ±0.5, ±1 is proposed to improve the DCT coeﬃcient performance. Next, we derive diﬀerent DCT coeﬃcients for diﬀerent transform block sizes based on DCT symmetry properties for H.265. Experimental results show that the proposed DCT can increase by 4 dB with a peak signal-to-noise ratio (PSNR) on average compared with general approximate DCT approaches. In comparison with recent approximation DCTs, the proposed architecture cannot only reduce the computational complexity but can also obtain good quality in PSNR. The proposed conﬁgurable DCT architecture successfully reduces approximately 40% of the hardware cost for multiple transform blocks.
|Journal||Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A|
|Number of pages||12|
|Publication status||Published - 17.08.2020|