
10 Image and Video Compression
The input imagef(x,y) is fed to the encoder, and the encoder creates a set of
symbols for the input data. These symbols are then transmitted through the
channel and provided as input to the decoder. The decoder in turn decodes
the data received and reconstructs an image f ′(x,y). The reconstructed
imagef ′(x,y) may be the same or may not be compared to f(x,y). Iff ′(x,y) is an
exact replica off(x,y), then there is no distortion in the reconstructed image.
Otherwise some level of distortion will be present in it. The encoder consists
of two subblocks: source encoder and channel encoder. The source encoder is ...