Inter frame

About: Inter frame is a research topic. Over the lifetime, 4154 publications have been published within this topic receiving 63549 citations.

Identifying scene boundaries using group sparsity analysis

Abstract: A method for identifying a set of key video frames from a video sequence comprising extracting feature vectors for each video frame and applying a group sparsity algorithm to represent the feature vector for a particular video frame as a group sparse combination of the feature vectors for the other video frames Weighting coefficients associated with the group sparse combination are analyzed to determine video frame clusters of temporally-contiguous, similar video frames The video sequence is segmented into scenes by identifying scene boundaries based on the determined video frame clusters

Apparatus for reordering data frames within an interface device

Abstract: An apparatus for reordering frames of data within an interface device of a receiving device. The present invention can switch context to allow frames associated with more than one sequence to be handled concurrently. A "Missing Frame Window" is generated and associated with each sequence. Each Missing Frame Window maintains a record of frames of a particular sequence received out of order. When a frame associated with a particular sequence is received out of order, a bit within the Missing Frame Window representing the "missing" frame is asserted to represent receipt of the out of order frame. The out of order frame is then stored to be transferred to a host in order upon receipt of those frames which must be transferred before transfer of the out of order frame.

Hierarchical Bi-Directional P Frames

Abstract: Embodiments of the present invention provide systems, methods and apparatuses for generating forward, backward or bi-directional P frames. Prior to encoding a sequence of video frames, P frames within the video sequence can be reordered to include causal and/or non-causal references to one or more reference frames. This allows any block partition of a bi-directional P frame to include a single reference to a reference frame that is temporally displayed either before or after the bi-directional P frame. Compression and visual quality can therefore be improved. Hierarchical frame structures can be constructed using bi-directional P frames to better accommodate low complexity decoding profiles. Multilayered encoded video bitstreams can be generated based on the hierarchical frame structures and can include a first layer of anchor frames and one or more second layers that include bi-directional P frames that reference the anchor frames and/or any frame in any lower level layer.

Frame layer bit allocation scheme for constant quality video

Abstract: In order to achieve constant quality across the whole video sequence under the channel bandwidth and buffer constraints, it is necessary to allocate more bits to frames with scene changes or high complexity and fewer bits to low complexity frames. In this work, we propose a new frame layer bit allocation scheme for H.264 video coding using mean absolute difference (MAD) ratio, which is the ratio of MAD of current frame to the average MAD from the starting frame up to the previous frame in a GOP. We provide a theoretical justification of MAD ratio as a measure of frame complexity. Bit budget is allocated to frames according to their MAD ratios, combined with the bits computed based on their buffer status. Simulation results show that the H.264 coder, using our proposed algorithm with virtually little computational complexity added, effectively alleviates visual quality degradation caused by high motion or scene changes. Our proposed algorithm significantly reduces the standard deviation of PSNR, hence producing a nearly constant video quality throughout the whole video sequence, when compared with other existing video schemes