A real-time encoding and decoding system (REDS) for
HDTV that can be used for nonlinear HDTV editing in studio has been
developed. The intrapicture coding of motion JPEG is implemented
and optimized in the REDS so that a high-quality image can be
recovered for the nonlinear editing. The REDS has a parallel architecture
with multiple programmable digital signal processors (DSP) and
reconfigurable field programmable logic devices (FPLD). The HDTV
image is spatially partitioned and concurrently processed by the
multiple processors. The programmable DSPs perform the discrete
cosine transform and quantization to reduce the spatial redundancy
of the HDTV image, whereas the FPLDs perform the variable length
coding to reduce the statistical redundancy. In addition, field-based
quantization matrices are developed for HDTV images. The REDS has
the programmability and the random accessibility of image frames,
the two most important features for a nonlinear HDTV editing system.