Document image retrieval is a task of searching document images
from the database based on users' queries.
In this paper, we propose a method of document image retrieval which
employs document images captured by digital cameras as queries.
Unlike document image retrieval using scanners,
it is necessary to deal with the problem of perspective distortion.
In the proposed method, document images are characterized using
local arrangements of feature points, which allows us fast retrieval
of O(N) where N is the number of feature points.
For the description of arrangements, perspective invariants
are employed for the retrieval under perspective distortion.
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