UPDATING IMAGE REGIONS DURING COMPOSITION

摘要

Techniques are described for determining a region to be updated in a frame based on positional changes of one layer from frame-to-frame. The positional changes may be displacement of a layer or removal of a layer from one frame to the next. In addition to the information of the positional changes, the techniques also utilize all areas for which the image content changed, but the position did not, for determining the region to be updated.