This book first introduces classic as well as recent computational
models for just-noticeable-difference (JND) applications. Since the
discrete cosine transform (DCT) is applied in many image and video
standards (JPEG, MPEG-1/2/4, H.261/3), the book also includes a
comprehensive survey of computational models for JND that are based on
DCT. The visual factors used in these computational models are reviewed
in detail. Further, an extensive comparative analysis of these models
using quantitative and qualitative performance criteria is presented,
which compares the noise shaping performance of these models with
subjective evaluation and the accuracy between the estimated JND
thresholds and subjective evaluation.
There are many surveys available on computational models for JND;
however, these surveys seldom compare the performance of computational
models that are based on DCT. The authors' survey of the computational
models and their in-depth review of the visual factors used in them will
help readers understand perceptual image coding based on DCT. The book
also provides a comparative analysis of several perceptual image coders
that are based on DCT, which are compatible with the highly popular and
widely adopted JPEG standard.