Inter frame

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

Novel True-Motion Estimation Algorithm and Its Application to Motion-Compensated Temporal Frame Interpolation

Abstract: In this paper, a new low-complexity true-motion estimation (TME) algorithm is proposed for video processing applications, such as motion-compensated temporal frame interpolation (MCTFI) or motion-compensated frame rate up-conversion (MCFRUC). Regular motion estimation, which is often used in video coding, aims to find the motion vectors (MVs) to reduce the temporal redundancy, whereas TME aims to track the projected object motion as closely as possible. TME is obtained by imposing implicit and/or explicit smoothness constraints on the block-matching algorithm. To produce better quality-interpolated frames, the dense motion field at interpolation time is obtained for both forward and backward MVs; then, bidirectional motion compensation using forward and backward MVs is applied by mixing both elegantly. Finally, the performance of the proposed algorithm for MCTFI is demonstrated against recently proposed methods and smoothness constraint optical flow employed by a professional video production suite. Experimental results show that the quality of the interpolated frames using the proposed method is better when compared with the MCFRUC techniques.

Method and apparatus for playing an MPEG data file backward

Abstract: The present invention has been made in consideration of linear reverse playback of MPEG video data and has particular applications to video special effect editing. According to one aspect of the present invention, the disclosed system uses a minimum number of frame storage to buffer decompressed I and P frames so as to decompress B frames in a reverse order and subsequently display the B frames. Every time, it comes to display the decompressed I and P frames buffered in the frame storage, an I frame or a P frame in a group of picture (GOP) prior to current GOP is decompressed and buffered into one of the frame storage that becomes available when the content therein has been retrieved for display. The cyclic use of the frame storage and the time that would be otherwise spent for decompressing B frames guarantees a linear reverse playback of MPEG video data without showing retardant visual effects that often result from non-even decoding processes in displaying compressed frames.

The optimal transform of motion-compensated frame difference images in a hybrid coder

Abstract: Using the statistical model proposed by the authors (1992), various statistical characteristics of motion-compensated frame difference (MCFD) images are derived. It is shown that the optimum Karhunen-Loeve (KLT) or the MCFD images is in fact identical to that of the original image sequence in intraframe mode, and that the discrete cosine transform (DCT) remains near optimal. The study this provides insights into the working of the MPEG and H.261 coders, including the justification for using the same DCT for both intra and interframe modes. Experiments on standard image sequences confirm the accuracy of the statistical model. >

Exposing video inter-frame forgery by Zernike opponent chromaticity moments and coarseness analysis

Abstract: Inter-frame forgery is the most common type of video forgery methods. However, few algorithms have been suggested for detecting this type of forgery, and the former detection methods cannot ensure the detection speed and accuracy at the same time. In this paper, we put forward a novel video forgery detection algorithm for detecting an inter-frame forgery based on Zernike opponent chromaticity moments and a coarseness feature analysis by matching from the coarse-to-fine models. Coarse detection applied to extract abnormal points is carried out first; each frame is converted from a 3D RGB color space into a 2D opposite chromaticity space combined with the Zernike moment correlation. The juggled points are then obtained exactly from abnormal points using a Tamura coarse feature analysis for fine detection. Coarse detection not only has a high-efficiency detection speed, but also a low omission ratio; however, it is accompanied by mistaken identifications, and the precision is not ideal. Therefore, fine detection was proposed to help to make up the difference in precision. The experimental results prove that this algorithm has a higher efficiency and accuracy than previous algorithms.

Fragmented reference in temporal compression for video coding

Abstract: In general, this disclosure describes techniques for encoding and decoding sequences of video frames using fragmentary reference pictures. The disclosure presents video encoding and decoding techniques for modified temporal compression based on fragmented references rather than complete reference pictures. In a typical sequence of video frames, only a portion (i.e., a tile) of each frame includes moving objects. Moreover, in each frame, the moving objects tend to be confined to specific areas that are common among each frame in the sequence of video frames. As described herein, such common areas of motion are identified. Pictures are then extracted from the identified areas of the video frames. Because these pictures may represent only portions of the frames, this disclosure refers to these pictures as "fragments." It is then these fragments that are used as reference pictures for generating predicted frames during a motion compensation process, rather than the entire frame.