A fast algorithm of 4-point floating DCT in image/video compression
Kai Tong, Ying Gu, Guo Lin Li, Xiang Xie, Shou Hao Liu, Kai Zhao, Zhihua Wang · 2012
This paper proposed a new improved fast floating 4-point discrete cosine transform (DCT) algorithm applied in image compression based on JPEG. This 1-D 4-point DCT algorithm employs only 1 multiplication without increasing the number of add operation. This new algorithm saves 50% multiplications of the fastest algorithm proposed in the past.