Prediction of discrete cosine transformed coefficients in resized pixel blocks

Abstract— A hybrid model was developed to predict the zeroquantized discrete cosine transform (ZQDCT) coefficients for intra blocks in our previous work. However, the complicated overhead computations seriously degrade its performance in complexity reduction. This paper proposes a new prediction algorithm with less overhead operations. First, each pixel block at the input of transform is resized to a block. Then, this downsized block is decomposed into a mean value and a residual pixel block. Finally, the 2-D DCT is computed from the mean value and this residual pixel block. Experimental results show that the proposed method reduces more redundant computations than the competing techniques and better real-time performance can be expected. This is particularly suitable for low-power processors with video sequences or great number of images to encode.

• Type: Journal
• Year: 2011
• Where: ICASSP
• Authors: Jin Li, Weiwei Chen, Moncef Gabbouj, Jarmo Takala, Hexin Chen
• Keywords: ICASSP 2011, Mean Value, Pixel Block, Residual Pixel Block, Signal Processing