The graph above shows recall performance for the first 200 parts returned or the first 1% of the total database of 20,807 parts.

Recall is calculated from the number of hits returned divided by the total number of hits in the database. Recall will increase as more parts are returned and the steeper the curve, the better the system performance. Two plots are shown here: the blue graph shows the performance using a detailed original drawing whereas the purple shows that for a sketch of the same items. Detailed and sketch drawings were produced for 14 different parts that were selected to give a representative range of items from the simple to the complex:

Search Speeds

Tests on the above 2D database with 38,797 views (comprising 20,807 parts) show that the coding speed for a single sketch (by definition clean and a single view) is almost instantaneous and the database scan takes under 5 seconds. The latter time comprises 2 seconds to re-calculate all the similarity coefficients and 3 seconds to re-index the database and update the image display. These times were taken on a standard personal computer of modest specification - 2.4GHz Pentium 4, 1GB memory, 120GB IDE hard disk. Most CAD workstations can be expected to be more powerful than this.