This paper advances and analyses an algorithm converting 2DRE quadtree to. raster. The algorithm can be served as the inverse operation of raster to 2DRE quadtree

but it is not direct inversion

instead

it takes other simpler measur i.e. intersection of 2DRE quadtree and code transforming method in Raster to Quadtree conversion

to make the algorithm more effective. It can also avoid possible trouble of memory overflow caused by the operation on bigger images in smaller memory.