This thesis addresses the problem of cell loss when transmitting video data over an
ATM network. Cell loss causes sections of an image to be lost or discarded in the
interconnecting nodes between the transmitting and receiving locations.
The method used to combat this problem is to use a technique called Error
Concealment, where the lost sections of an image are replaced with approximations
derived from the information in the surrounding areas to the error. This technique
does not require any additional encoding, as used by Error Correction. Conventional
techniques conceal from within the pixel domain, but require a large amount of
processing (2N2 up to 20N2) where N is the dimension of an N×N square block.
Also, previous work at Loughborough used Linear Interpolation in the transform
domain, which required much less processing, to conceal the error. [Continues.
