公开(公告)号：DE69939954D1

公开(公告)日：2009-01-02

申请号：DE69939954

申请日：1999-11-11

Applicant: ST MICROELECTRONICS ASIA

Inventor： HUI YAU WAI LUCAS

IPC: H04N17/00

Abstract: A method and apparatus for noise level estimation in a digital video signal, the apparatus including a pixel activity detector that produces a mean pixel activity level for each picture in the video signal, a contrast analyzer that produces a contrast activity level for each picture and a noise level calculator that is coupled to the activity detector and contrast analyzer to produce an estimated noise level by offsetting the contrast activity level from accumulated output of the activity detector.

公开(公告)号：DE69942157D1

公开(公告)日：2010-04-29

申请号：DE69942157

申请日：1999-05-13

Applicant: ST MICROELECTRONICS ASIA

Inventor： OH HONG LYE ,  HUI YAU WAI LUCAS

IPC: H04N7/36 ,  G06T7/20 ,  H04N7/26

Abstract: A method and apparatus of encoding digital video according to the ISO/IEC MPEG standards (ISO/IEC 11172-2 MPEG-1 and ISO/IEC 13818-2 MPEG-2) using an adaptive motion estimator. A plurality of global motion vectors are derived from the motion vectors of a previous picture in a sequence, and the global motion vectors are analyzed to determine motion characteristics. The video encoding is arranged to enable switching among different types of local motion estimators based on the motion characteristics of the moving pictures sequence. This gives rise to a motion estimation algorithm that can adaptively change its search range, search area and block matching scheme to suit different types of moving sequences.