Patent Number: 6,480,543

Title: Detection of a change of scene in a motion estimator of a video encoder

Abstract: The compression and coding of digital data pertaining to video sequences of pictures including motion estimation for removing temporal redundance are provided by recognizing the occurrence of a change of a scene to control the prediction computation of the pictures. This control is provided using a forward motion estimation for pictures preceding the change of scene, and using a backward motion estimation for pictures subsequent the change of scene of a given sequence. A change of a scene is reliably detected by checking two distinct indexes. These indexes are based on an average value of a smoothness index of the preestablished number of last processed pictures. The smoothness index of a motion field of each picture is calculated by analyzing the motion vectors for all the macroblocks of a subdivision of the picture, except for the peripheral macroblocks. Spurious detections in the event of noisy pictures, zooming and other situations that may adversely affect either one of the indexes are prevented.

Inventors: Pau; Danilo (Sesto San Giovanni, IT), Bagni; Daniele (Olgiate Molgora, IT), Pezzoni; Luca (Cormano, IT)

Assignee: STMicroelectronics S.r.l.

International Classification: H04N 7/26 (20060101); H04N 7/36 (20060101); H04N 5/14 (20060101); H04N 7/50 (20060101); H04N 7/46 (20060101); H04B 001/66 ()

Expiration Date: 11/12/2019