Daniele Rufo

Rate–Distortion Optimised Image Compression with Directional Intra Prediction, Adaptive Transforms and Context-Adaptive Arithmetic Coding

This paper presents a complete still-image codec built onrate–distortion (RD) optimised block coding. The design combines aquadtree partition over 16×16 to 4×4 coding units, thirty-five directionalintra prediction modes with most-probable-mode signalling, adaptiveselection betwee...

Mathematical Abstract of a DCT-QIM Watermarking System with RS Coding and Soft Beam Decoding

This note gives a concise mathematical description of a watermarking pipeline that embedsa short payload into the mid-frequency DCT coefficients of image blocks using QuantizationIndex Modulation (QIM), protects the payload with Reed–Solomon (RS) channel codingover GF(28), and re...