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#### 18.2 Prediction Subblocks {#h-18-02}
The prediction calculation for each subblock is then as follows. Temporarily disregarding the fractional part of the motion vector (that is, rounding "up" or "left" by right-shifting each component 3 bits with sign propagation) and adding the origin (upper left position) of the (16x16 luma or 8x8 chroma) current macroblock gives us an origin in the Y, U, or V plane of the predictor frame (either the golden frame or previous frame).
Considering that origin to be the upper left corner of a (luma or chroma) macroblock, we need to specify the relative positions of the pixels associated to that subblock, that is, any pixels that might be involved in the sub-pixel interpolation processes for the subblock.