Patent ID: 6885702
Filing Date: 2005-04-26
Classification: H04N

Abstract:
1. A method for synchronization of the spatial position of a video image in order to recover the position of an initial grid for digital coding of the image by coding blocks without using a reference image, the method comprising: a) shifting, along the direction of the lines of the image and/or along the direction perpendicular to the lines of the image, an analysis grid including said coding blocks and corresponding to at least one part of the image; b) determining, at each position of the analysis grid, transform coefficients of each block of the analysis grid via a block transform, and, for each position of the analysis grid, calculating from said transform coefficients an activity parameter representative of the activity of the image; and c) determining the position of the analysis grid for which the activity parameter represents minimal activity, and ratifying the position as a synchronization position.