Abstract: In an exemplary process, a speech input including a referenced virtual object is received. Based on the speech input, a first reference set is obtained. The first reference set is then compared to a plurality of second reference sets. Based on the comparison, a second reference set from the plurality of second reference sets is obtained. The second reference set may be identified based on a matching score between the first reference set and the second reference set. An object is then identified based on the second reference set. Based on the identified object, the reference virtual object is displayed.

Abstract: The present invention provides novel techniques for generating more robust fingerprints (1) of video signals (2). Certain embodiments of the invention derive video fingerprints only from blocks (21) in a central portion (22) of each frame (20), ignoring a remaining outer portion (23), the resultant fingerprints (1) being more robust with respect to transformations comprising cropping or shifts. Other embodiments divide each frame (or a central portion of it) into non-rectangular blocks, such as pie-shaped or annular blocks, and generate fingerprints from these blocks. The shape of the blocks can be selected to provide robustness against particular transformations. Pie blocks provide robustness to scaling, and annular blocks provide robustness to rotations, for example. Other embodiments use blocks of different sizes, so that different portions of the frame may be given different weighting in the fingerprint.