Patent ID: 6385247
Filing Date: 2002-05-07
Classification: H04N

Abstract:
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 sub-pictures; (b) 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; (c) a transform circuit for transforming each of said sub-pictures into a two-dimensional coefficient block of coefficients if no motion has been detected within said sub-picture, and for transforming interlaced sub-fields constituting said sub-picture into respective sub-blocks of coefficients if motion has been detected within said sub-picture; and (d) scanning means for reading said coefficients of said block or sub-blocks in accordance with a predetermined scanning pattern, and for converting said coefficients into a sequence of coefficients, wherein, in response to said motion signal indicating no 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 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, said scanning means reading the coefficients of the sub-blocks alternately, and wherein, in response to said motion signal indicating noticeable motion having been detected within a sub-picture, said scanning means reads the coefficients of the block following the pattern depicted in FIG. 7 of the drawings.