Patent ID: 8743418

Claim:
An image processing apparatus for subjecting objects to rendering processing, comprising: a generation unit configured to generate a first display list of a first object and a second display list of a second object from a first rendering instruction of the first object and a second rendering instruction of the second object respectively, the first display list and the second display list including a first pair of an up-edge and a down-edge of the first object and a second pair of an up-edge and a down-edge of the second object respectively; a determination unit configured to determine whether the first pair included in the first display list coincides with the second pair included in the second display list, by comparing the up-edge and the down-edge of the first object to the up-edge and the down-edge of the second object respectively; and a deletion unit configured to delete the pair of the up-edge and the down-edge of the second object in a case where the determination unit has determined that the pairs coincide with each other.