Topic
Inter frame
About: Inter frame is a research topic. Over the lifetime, 4154 publications have been published within this topic receiving 63549 citations.
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Papers
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22 Dec 1998TL;DR: In this article, a video signal is deinterlaced using a motion detector and a divider, a comparator, and an interpolator to reduce combing artifacts in a video frame.
Abstract: Deinterlacing a video signal using a motion detector is disclosed. In one embodiment, a divider, a comparator, and an interpolator deinterlace a video signal and reduce combing artifacts. The divider forms a ratio of inter-field activity to intra-field activity in a video frame. The ratio is compared to an empirically determined threshold. If the ratio is greater than the threshold, then there is motion in the frame and the second field is interpolated from the first field. If the ratio is less than the threshold, then there is no motion in the frame and no change is made to the frame.
31 citations
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13 May 2009
TL;DR: In this paper, a method for key frame extraction from video data streams in a video service system is presented. But the method is not suitable for the case where the motion vector of each frame in the video data stream is obtained and the characteristics vector aggregate according to motion vector is determined.
Abstract: An extracting method of the key frame, a video service apparatus and a video service system are disclosed, in which the method is applied to extract the key frame of the video data stream in the video service system. The method comprises: obtaining the motion vector of each frame in the video data stream, and obtaining the characteristics vector aggregate according to the motion vector; determine whether the direction and the amplitude of the motion vector corresponding to the characteristics vector aggregate of the forward and the backward adjacent two frames occurs change or not; extracting the key frame using the determining result. So the frame whose speed changes abruptly could be extracted effectively.
31 citations
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21 Dec 2012TL;DR: In this paper, a motion estimator may generate and output a motion vector that represents a change in position between a current block of the current frame and a matching reference block of a reference frame of the reference frame.
Abstract: Techniques to perform fast motion estimation are described An apparatus may comprise a motion estimator operative to receive as input a current frame and a reference frame from a digital video sequence The motion estimator may generate and output a motion vector The motion vector may represent a change in position between a current block of the current frame and a matching reference block of the reference frame The motion estimator may utilize an enhanced block matching technique to perform block matching based on stationary and spatially proximate blocks Other embodiments are described and claimed
31 citations
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16 Feb 2009TL;DR: In this paper, the authors present a method for image processing, comprising receiving a video frame, coding a first portion of the video frame at a different quality than a second portion, based on an optical property.
Abstract: Systems and methods for image processing, comprising receiving a video frame, coding a first portion of the video frame at a different quality than a second portion of the video frame, based on an optical property, and displaying the video frame.
31 citations
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TL;DR: The proposed MC models are harnessed and a comprehensive analysis of the system is presented, to qualitatively predict the experimental results, and it is shown that the theory explains qualitatively the empirical behavior.
Abstract: Block-based motion estimation (ME) and motion compensation (MC) techniques are widely used in modern video processing algorithms and compression systems. The great variety of video applications and devices results in diverse compression specifications, such as frame rates and bit rates. In this paper, we study the effect of frame rate and compression bit rate on block-based ME and MC as commonly utilized in inter-frame coding and frame rate up-conversion (FRUC). This joint examination yields a theoretical foundation for comparing MC procedures in coding and FRUC. First, the video signal is locally modeled as a noisy translational motion of an image. Then, we theoretically model the motion-compensated prediction of available and absent frames as in coding and FRUC applications, respectively. The theoretic MC-prediction error is studied further and its autocorrelation function is calculated, yielding useful separable-simplifications for the coding application. We argue that a linear relation exists between the variance of the MC-prediction error and temporal distance. While the relevant distance in MC coding is between the predicted and reference frames, MC-FRUC is affected by the distance between the frames available for interpolation. We compare our estimates with experimental results and show that the theory explains qualitatively the empirical behavior. Then, we use the models proposed to analyze a system for improving of video coding at low bit rates, using a spatio-temporal scaling. Although this concept is practically employed in various forms, so far it lacked a theoretical justification. We here harness the proposed MC models and present a comprehensive analysis of the system, to qualitatively predict the experimental results.
31 citations