| 摘要 |
Methods, systems, and apparatus, including computer program products, for determining a complexity for a subregion of an electronic document page that includes one or more objects. In one aspect, a method includes dividing a subregion of an electronic document page into a plurality of cells, where the electronic document page includes one or more objects, the objects include one or more transparent objects, the subregion includes at least part of a transparent object, and each cell has an associated cell complexity. The method includes, for each object partly or completely located in the subregion, identifying cells that are overlapped by the object, and increasing the associated cell complexity for each of the identified cells. The method includes combining all cell complexities associated with all cells in the subregion to determine a complexity for the subregion.
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