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## **Reconstructing objects**  Many segmented objects are suitable for domain-specific interpretation.   1. Chemical structures **Chemical structures**  are lines and characters, with occasional circles; we often approach 100% Recall/Precison for vector or good pixel diagrams. 2. Phylogenetic trees **Phylogenetic trees**  are often tractable, consisting of a single connected trees with labels close to the tip. We can process rooted trees (orthogonal and circular) and unrooted and for simple diagrams precision is often 100% 3. X-y plots. **X-y plots**.  These are often very tractable - again with high precision; they contain:   * X- and / or Y- axes each consisting of lines with tick marks, scales, quantities and units  * symbols or points, perhaps with error bars and legands for each type