Abstract: Systems and techniques are provided for performing user authentication. For example, a process can include obtaining a plurality of images associated with a face and a facial expression of the user, wherein each respective image of the plurality of images includes a different portion of the face. An encoder neural network can be used to generate one or more predicted three-dimensional (3D) facial modeling parameters, wherein the encoder neural network generates the one or more predicted 3D facial modeling parameters based on the plurality of images. A reference 3D facial model associated with the face and the facial expression can be obtained. An error can be determined between the one or more predicted 3D facial modeling parameters and the reference 3D facial model, and the user can be authenticated user based on the error being less than a pre-determined authentication threshold.

Abstract: In one example, a device for retrieving video data includes a display interface coupled to a display, a memory configured to store video data, and one or more processors configured to determine a plurality of regions of video data to be displayed via the display, retrieve video data having a first quality for a first subset of the plurality of regions at which a visual focus of a user is directed, retrieve video data having a second quality for a second subset of the plurality of regions that neighbor the first subset of the plurality of regions, wherein the second quality is lower than the first quality, and retrieve video data having a third quality for a third subset of the plurality of regions that is outside the first subset and the second subset, wherein the third quality is lower than the second quality.

Abstract: In one example, a device for retrieving video data includes a display interface coupled to a display, a memory configured to store video data, and one or more processors configured to determine a plurality of regions of video data to be displayed via the display, retrieve video data having a first quality for a first subset of the plurality of regions at which a visual focus of a user is directed, retrieve video data having a second quality for a second subset of the plurality of regions that neighbor the first subset of the plurality of regions, wherein the second quality is lower than the first quality, and retrieve video data having a third quality for a third subset of the plurality of regions that is outside the first subset and the second subset, wherein the third quality is lower than the second quality.

Abstract: According to an aspect of the present invention two streams data encoding corresponding information contained in a multimedia signal are generated with one bitstream (“first stream”) providing for reproduction of the information with a base quality (e.g., according to a corresponding standard), and the second bitstream (“second stream”) containing information which can be used to further enhance the quality of reproduction.

Abstract: Random access decoding start points (audio frame headers) for AMR-type files are found by sequential elimination of types of file points from consideration for a block of file points following a random access selected point. Chaining of file points according to frame header format interpretation gives paths of points through the block, and selection of maximal path(s) includes sums of weights of the points of a path. The next-to-initial points of such a maximal path provides a decoding start point.

Abstract: A signal modification technique facilitates compact voice coding by employing a continuous, rather than piece-wise continuous, time warp contour to modify an original residual signal to match an idealized contour, avoiding edge effects caused by prior art techniques. Warping is executed using a continuous warp contour lacking spatial discontinuities which does not invert or overly distend the positions of adjacent end points in adjacent frames. The linear shift implemented by the warp contour is derived via quadratic approximation or other method, to reduce the complexity of coding to allow for practical and economical implementation. In particular, the algorithm for determining the warp contour uses only a subset of possible contours contained within a sub-range of the range of possible contours. The relative correlation strengths from these contours are modeled as points on a polynomial trace and the optimum warp contour is calculated by maximizing the modeling function.