In an image processor on multi-level image data, an edge direction of a target pixel is discriminated from differences in density level between the target pixel and adjacent pixels thereof. The material is preferably hydroxyapatite cement, bone source, or similar material, such as ionomeric bone cement. A lower electrode is formed by patterning in each pixel on a substrate. A roof joint patch kit is also disclosed which comprises a roll of roofing membrane and a plurality of double-sided tape strips. Finally, the transport unit transports the candidate wafer lots to the desired destination according to the transport commands.