摘要:
Embodiments of the invention describe a system and a method for determining securely a result of applying a function to a first encrypted signal and a second encrypted signal resulted from encrypting a first signal and a second signal respectively, The method expresses the function as a linear combination of homomorphic components, wherein a homomorphic component is an algebraic combination of the first signals and the second signal such that an encrypted result of the algebraic combination is suitable to be calculated directly from the first encrypted signal and the second encrypted signal using homomorphic properties. Next, the method determines encrypted results of the homomorphic components from the first encrypted signal and the second encrypted signal, and combines the encrypted results of the homomorphic components according to the linear combination to produce the encrypted result of the function. The method is executed by a plurality of processors.
摘要:
Multiview videos are acquired of a scene with corresponding cameras arranged at poses, such that there is view overlap between any pair of cameras. V-frames are generated from the multiview videos. The V-frames are encoded using only spatial prediction. Then, the V-frames are inserted periodically in an encoded bit stream to provide random temporal access to the multiview videos. Additional view dependency information enables the decoding of a reduced number of frames prior to accessing randomly a target frame for a specified view and time, and decoding the target frame. The method also decodes multiview videos by maintaining a reference picture list for a current frame of a plurality of multiview videos, and predicting each current frame of the plurality of multiview videos according to reference pictures indexed by the associated reference picture list.
摘要:
A method and system manage a hierarchy of passwords for users accessing a hierarchy of access control devices. First, a codeword is acquired and a syndrome of the codeword is determined. Next, the codeword is randomly modified with a probability p to produce a modified codeword. The modified codeword is selected and assigned to a user as a password, if the modified codeword is recoverable.
摘要:
A method that embeds a message into a document containing a number of glyphs and extracts said message from a degraded version of said document. Each symbol of the message is represented as a geometrical relationship of two discrete sets of pixels, in which the pixels in each set are adjacent. The pixels associated with the glyphs selected from the document are combined with the discrete sets of pixels to produce modified glyphs that contain the embedded message.
摘要:
A method randomly accesses multiview videos. Multiview videos are acquired of a scene with corresponding cameras arranged at poses, such that there is view overlap between any pair of cameras. V-frames are generated from the multiview videos. The V-frames are encoded using only spatial prediction. Then, the V-frames are inserted periodically in an encoded bitstream to provide random temporal access to the multiview videos.
摘要:
A system and method generates a progressive codestream representing an image. The codestream of packets representing an image is parsed to obtain a parsed packets and metadata for each parsed packet. The parsed packets are decomposed to decomposed packets according to the metadata and a progressive transmission policy. The decomposed packets are assigned to sequentially arranged segments according to the metadata and the transmission policy, in which each segment includes a header, and in which an ordering of the packet in the codestream is different than an ordering of the decomposed packets in the plurality of segments. A client composes the decomposed packets according to the header in the segments to progressively reconstruct the image in the client.
摘要:
A model stored in a memory accessible by a video transcoder includes a first rate-distortion function modeling a requantization of an input video. A second-rate distortion function models a resynchronization marker insertion rate for the transcoded video, and a third rate-distortion function models an intra-block insertion rate for the transcoded video.
摘要:
A method classifies pixels in an image by first partitioning the image into blocks. A variance of an intensity is determined for each pixel, and for each block the pixel with the maximum variance is identified. Then, the blocks are classified into classes according to the maximum variance.
摘要:
A method and system acquire and display light fields. A continuous light field is reconstructed from input samples of an input light field of a 3D scene acquired by cameras according to an acquisition parameterization. The continuous light is reparameterized according to a display parameterization and then prefiltering and sampled to produce output samples having the display parametrization. The output samples are displayed as an output light field using a 3D display device. The reconstruction can be performed by interpolating the input samples having the different views;
摘要:
A method encodes an inter-frame of a compressed video, the inter-frame including multiple macroblocks in a predetermined order. Each macroblock has an associated motion vector. For each current macroblock in the predetermined order, a set of near macroblocks are identified. An index is assigned to each near macroblock. A difference between the motion vector of the current macroblock and the motion vector of each near macroblocks is determined. The indices of the near macroblocks are then sorted in order of the differences and appended to the inter-frame.