| 摘要 |
<p>PCT No. PCT/DE90/00225 Sec. 371 Date Jul. 22, 1991 Sec. 102(e) Date Jul. 22, 1991 PCT Filed Mar. 21, 1990 PCT Pub. No. WO90/15506 PCT Pub. Date Dec. 13, 1990.A 16x16 picture block of an HDTV television picture is transformed with a discrete cosine transformation as a 16x16 frame block or is separately transformed in respectively two 16x8 field blocks according to a decision method. Picture value differences between pairs of field picture elements of two picture lines of the same field are absolutely summed up to form a field sum. Likewise, picture value differences between pairs of frame picture elements of two picture lines of the frame are absolutely summed up to form a frame sum. The frame sum multiplied by a frame weighting factor is subtracted from the field sum to form what may be a positive decision result. Given a positive decision result, the frame is transformed; otherwise, the two fields are separately transformed.</p> |
