EVALUATION OF SENSITIVITY OF INTEGER DCTS

摘要

This report compares reconstructed signal quality and confirms improvement of recently proposed six types of integer DCT algorithm such as BinDCT-IIC,-IIL, -IV, -IIS, IntDCT-II, LDCT-II [9] by means of sensitivity to finite word length. In addition, this report evaluates these integer DCT algorithms in respect of not only the sensitiveness of finite word length expression but also lossless coding performance, compatibility with the conventional DCT and computational load. It is confirmed that the LDCT-II is the best for lossless coding performance. In case of compatibility with the conventional DCT, all integer DCTs in experiment are compatible with the conventional one and the BinDCT-IIL algorithm considered by the computational load has the least number of multiplier coefficients, it is advantageous to hardware complexity.