Residual frame

About: Residual frame is a research topic. Over the lifetime, 4443 publications have been published within this topic receiving 68784 citations.

Method and apparatus for encoding and decoding video signals in intra-base-layer prediction mode by selectively applying intra-coding

Abstract: A method and apparatus for encoding and decoding macroblocks in an intra-base layer prediction mode by selectively applying intra-coding are provided. The method includes the steps of calculating a difference between an input frame and a base layer frame calculated from the input frame and obtaining residual signals, converting the residual signals using an intra-coding method, and generating an enhancement layer frame including the converted residual signals.

Methods and apparatus for generating noise signals from speech signals

Abstract: In methods and apparatus for generating an LPC-encoded noise signal from an LPC-encoded speech signal excitation parameters of the LPC-encoded speech signal for a current frame are randomized upon detection of speech in the current frame. For frames in which no speech is detected, LPC coefficients and frame energy for the current frame may be replaced with respective averages calculated over the current frame and a plurality of preceding frames. For frames in which speech is detected, LPC coefficients for the current frame may be replaced with respective averages of LPC coefficients used to replace LPC coefficients of an immediately previous frame. The comfort noise generation technique is particularly suitable for use in echo suppressors for digital cellular radio systems.

System and method for performing motion capture and image reconstruction

Abstract: A system and method are described for performing motion capture on a subject. For example, a computer-implemented method according to one embodiment of the invention comprises: creating a scalar field for the three- dimensional (3-D) capture volume of the subject; generating a surface mesh for the scalar field; retaining good vertices and removing bad vertices of the surface mesh; and storing the good vertices for use in subsequent reconstruction of the motion of the subject. Another computer-implemented method comprises: capturing a series of image frames of the subject over a period of time each frame each frame having a plurality of vertices defining a captured surface of the subject; establishing a reference frame having one or more of the plurality of vertices; performing frame-to-frame tracking to identify vertices within the N'th frame based on the (N-1 )'th frame or an earlier frame; and performing reference- to-frame tracking to identify vertices within the N'th frame based on the reference frame to counter potential drift between the frames. Yet another computer- implemented method comprises: capturing motion capture data including a plurality of images of the N vertices during a motion capture session; retrospectively identifying X of the N vertices to track across the plurality of images where X < N; and tracking the X vertices across the plurality of images.

Compensator and Compensation Method for Audio Frame Loss in Modified Discrete Cosine Transform Domain

Abstract: A compensation method for audio frame loss in a Modified Discrete Cosine Transform (MDCT) domain is provided in the present invention The method include: step a, when the frame currently lost is the p-th frame, obtaining a set of frequency points to be predicted; for each frequency point of said set, using the phases and magnitudes of the multiple frames preceding the (p-1)-th frame in the Modified Discrete Cosine Transform - Modified Discrete Sine Transform (MDCT-MDST) domain to predict the phase and magnitude of the p-th frame; using the predicted phase and magnitude to gain the MDCT coefficients corresponding to each frequency point of the p-th frame; step b, for the frequency points of a frame except for said set, using the coefficient values of the multiple frames preceding the p-th frame to calculate the MDCT coefficient values of the p-th frame at said frequency points; step c, performing an inverse MDCT on the MDCT coefficients of the p-th frame at all frequency points to gain the time domain signal of the p-th frame A compensator for the frame loss is also provided in the invention The invention has advantages of no delay, small calculation amount as well as storage amount and easy implementation

Stereo video coding based on quad-tree decomposition of B– P frames by motion and disparity interpolation

Abstract: A new optimised technique for coding stereoscopic image sequences is presented and compared with already known methods. The proposed technique, called enhanced interpolated motion and disparity estimation (EIMDE), is based on the joint method, which encodes the frames of the right image sequence by exploiting both the temporal redundancy of the same sequence and the disparity redundancy with the left image sequence. In the proposed method, a variable block size scheme has been employed for motion and disparity estimation. The block size is controlled by quad-tree decomposition of the processed frame based on a rate-distortion splitting criterion. For the prediction of a macroblock, optimised motion and disparity vectors are jointly estimated and the participating proportion of each similarity is suitably searched. In this way, the energy of the resulted residual frame is minimised and the whole framework is optimised. Finally, the residual frame is decomposed by a discrete wavelet transform and is further compressed by morphological encoding the resulting coefficients. The proposed coder has been experimentally evaluated on real image sequences, where it produced good performance over other known methods.