论文标题
低复杂性Loeffler DCT近似图像和视频编码
Low-Complexity Loeffler DCT Approximations for Image and Video Coding
论文作者
论文摘要
本文基于Loeffler离散余弦变换（DCT）算法引入了矩阵参数化方法。结果，提出了一类新的八点DCT近似值，能够统一文献中存档的几个八点DCT近似值的数学形式主义。帕累托效率的DCT近似是通过多准则优化获得的，其中考虑了计算复杂性，接近性和编码性能。有效的近似及其缩放的16和32点版本嵌入了图像和视频编码器中，包括类似JPEG的编解码器以及H.264/AVC和H.265/HEVC标准。将结果与未修饰的标准编解码器进行比较。在Xilinx VLX240T FPGA上映射并实现了有效的近似值，并评估了面积，速度和功耗。
This paper introduced a matrix parametrization method based on the Loeffler discrete cosine transform (DCT) algorithm. As a result, a new class of eight-point DCT approximations was proposed, capable of unifying the mathematical formalism of several eight-point DCT approximations archived in the literature. Pareto-efficient DCT approximations are obtained through multicriteria optimization, where computational complexity, proximity, and coding performance are considered. Efficient approximations and their scaled 16- and 32-point versions are embedded into image and video encoders, including a JPEG-like codec and H.264/AVC and H.265/HEVC standards. Results are compared to the unmodified standard codecs. Efficient approximations are mapped and implemented on a Xilinx VLX240T FPGA and evaluated for area, speed, and power consumption.
