Patent ID: 7646813

Claim:
An encoding circuit for transform coding pictures of an interlaced video signal, said encoding circuit comprising; (a) means for partitioning each of said pictures into a plurality of interlaced sub-pictures; (b) a transform circuit for transforming each of said sub-pictures into a two-dimensional coefficient block of coefficients; (c) a motion detector for receiving each of said sub-pictures and for generating a motion signal when noticeable motion has been detected within a received sub-picture; and (d) scanning means for reading said coefficients of said block in accordance with a predetermined scanning pattern depending on the motion signal, and for converting contiguous coefficients into a sequence of coefficients, wherein, in response to said motion signal indicating no noticeable motion has been detected within a sub-picture, said scanning means provides each read coefficient contiguous to a previously read coefficient, and in response to said motion signal indicating noticeable motion has been detected within a sub-picture, said scanning means provides at least one jump to a predetermined coefficient of said block which is not contiguous to a previously read coefficient.