Inter frame

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

Search Algorithms for Block-Matching in Motion Estimation

Abstract: Interframe predictive coding is used to eliminate the large amount of temporal and spatial redundancy that exists in video sequences and helps in compressing them. In conventional predictive coding the difference between the current frame and the predicted frame (based on the previous frame) is coded and transmitted. The better the prediction, the smaller the error and hence the transmission bit rate. If a scene is still, then a good prediction for a particular pel in the current frame is the same pel in the previous frame and the error is zero. However, when there is motion in a sequence, then a pel on the same part of the moving object is a better prediction for the current pel. The use of the knowledge of the displacement of an object in successive frames is called Motion Compensation. There are a large number of motion compensation algorithms for interframe predictive coding. In this study, however, we have focused only on one class of such algorithms, called the Block Matching Algorithms. These algorithms estimate the amount of motion on a block by block basis, i.e. for each block in the current frame, a block from the previous frame is found, that is said to match this block based on a certain criterion. There are a number of criteria to evaluate the "goodness" of a match and some of them are: 1. Cross Correlation Function 2. Pel Difference Classification (PDC) 3. Mean Absolute Difference 4. Mean Squared Difference 5. Integral Projection

Video signal coding method

Abstract: A video signal coding method is provided which finds proper decision curves according to characteristics of input frames and encodes the optimal macroblock by using the decision curves instead of a fixed motion/no-motion compensation curve and intra/inter coding curve. The optimal mode is selected for each macroblock of input frame and it is determined through a step of judging whether the input frame is intra mode using a given function, a step of judging whether the input frame is inter mode when it is not intra mode using a given function, a step of controlling quantizer using a predetermined critical value when it is not inter mode, and step of performing skip when the quantizer controlling step is not carried out.

Method and apparatus for decoding video signals

Abstract: A method for decoding video signals comprising decoding a bit stream, and reproducing a video signal in reverse order of frames, the bit stream including each frame of the video signal which has been encoded using one of an intra coding system (I picture), a predictive coding system (P picture), and a bidirectionally predictive coding system (B picture), includes a group of frames including at least one frame of I picture, which can be decoded from the I picture and consecutively reproduced in order of the frames, being called a GOP (Group of Pictures); the frames being output in reverse order of the frames to obtain a desired frame, wherein: when the desired frame is one of I picture and P picture, only the I picture and P pictures from the first I picture in a GOP to the desired frame are decoded; and when the desired frame is B picture, only the desired frame is decoded if reference frames required for decoding of the desired frame are present in frame memories. As described above, in the method for decoding video signals according to the present invention, decoding processing of a desired frame is performed each time to output a reproduced image. Consequently, an increase in circuit scale can be avoided, resulting in smooth backward reproduction with a small memory capacity.

Video processor architecture and method for frame rate conversion

Abstract: A video processor, upstream of a frame rate converter determines video attribute data. This attribute data is formatted and passed along a channel to the frame rate converter. The frame rate converter extracts the attribute data from the channel for use in frame rate conversion. The frame rate converter may thus rely on attribute data obtained by the video processor, and need not re-analyze video frames.