A set of spatial motion information predictors to be encoded is generated from among spatial motion information predictors respectively associated with predetermined image portions adjacent to an image portion to be decoded, one of which is situated above the image portion to be decoded. At least one condition is used to determine that a spatial motion information predictor is not includable in the set. At least one condition is a condition to exclude from the generated set of spatial motion information predictors a spatial motion information predictor that is a duplicate of another spatial motion information predictor. A temporal motion information predictor is not subjected to the duplicate exclusion condition used for the spatial motion information predictors and may be a duplicate of a spatial motion information predictor in the generated set. A motion information predictor is selected from among (i) the generated set of motion information predictors, (ii) the temporal motion information predictor, and (iii) a zero motion information predictor as a replacement for a non-includable spatial motion information predictor.