S506: Select the combined temporal and spatial interpolation filtering to perform the super-resolution picture recovery on the inter-frame coded macroblock. For example, when an optional combined temporal and spatial interpolation filtering as follows is used, in the macroblock shown in FIG. 6, a pixel p is a pixel to be interpolated, pixels a, b, c, and d are existing pixels, and a pixel i is a pixel of the corresponding macroblock in the picture obtained from the full-resolution standard decoding of the corresponding I frame, so that p=(2*i+4*(b+c)?a?d+4)/8. In an actual application, other forms of interpolation filtering calculation manners are also available.

In a specific implementation of the present invention, the following three parameters are obtained from calculation according to the motion vector and residual data of the macroblock:

a) sum of absolute values of residuals of the macroblock: sum;

b) sum of integer pixel motion vectors in horizontal and vertical directions of the macroblock: sum_mv; and

c) a value of a residual having the maximum absolute value among residuals of the macroblock: max_res.