IDX(Am,Ai) = (IDXm(Am), IDXi(Ai)) = (CONCEPT-REDUC(Am), IMAGE-REDUC(Ai))
Explanation:
In iconic indexing, the conceptual meaning as well as the image of
an icon is simplified, so that a less complicated icon is constructed to serve as
an index to the original icon.
For the logical part (meaning) of an icon, the simplification is achieved
by reducing the conceptual graph, or by tree pruning. For the physical part (image) of
an icon, the simplification is achieved by obtaining the sketch, the
silhouette, the contour, or the sub-region, of an image.