Joint fractional point motion evaluation and interpolation method for H.264 video coding

Abstract

The invention provides a joint fractional point motion evaluation and interpolation method for H.264 video coding, comprising the following steps: 1) a cost performance ratio preferential motion evaluation method: dividing a searching area of the fractional point motion evaluation into four groups, determining the cost performance ratio priorities of each group from the highest to the lowest, performing the fractional point motion evaluation according to the sequence of the cost performance ratio priorities, checking the values of the fractional points with the high priorities firstly, then checking the values of the fractional points with the low priorities, and checking according to the clockwise direction when the searching points having the same priority exist; and 2) a cost performance ratio preferential interpolation method: grouping according to the cost performance ratio priorities and performing interpolation in the interpolation operation of the fractional points.

Description

technical field [0001] The invention belongs to the field of fractional point motion estimation of video coding, in particular to a joint fractional point motion estimation and interpolation method for H.264 video coding. Background technique [0002] Existing video coding standards such as H.263, H.264, and MPEG-4 are all based on the framework of hybrid coding, that is, coding is performed in both the time domain and the space domain. When coding, first use inter-frame coding to eliminate the correlation in the time domain, and then transform and code the residual value of the prediction result in the time domain to eliminate the spatial correlation, and finally perform entropy coding to eliminate statistical redundancy. [0003] The specific encoding process is as follows: first, the motion vector between the current frame and the reference frame macroblock is obtained through motion estimation, and then the residual value between the macroblocks is obtained by inter-fram...

AI Technical Summary

Problems solved by technology

[0010] Fractional point motion estimation can significantly improve the system performance. Under the same conditions, it can improve the video quality by 2-3dB or reduce the bit rate by about 40%. computing power

At the same time, because the existing interpolation algorithm is dependent on the calculation of fractional points, it cannot be directly calculated. If the formula for directly interpolating all fractional points through integer points is obtained through derivation, there will be many repeated calculations

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