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Is there a tool to simplify checking for die-matches?
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<p>[QUOTE="Ed Snible, post: 4726769, member: 82322"]Donna, even the same coin is hard to match against itself! With bas relief the light source angle makes a huge difference.</p><p><br /></p><p>The Ex-Numis provenance search only uses the edge of the coin when doing image matching for this reason. Even then, it still doesn't find everything.</p><p><br /></p><p>(Anyone interested in computer aided finding of provenance should watch Dr. Fleuck of Ex-Numis explain the ideas behind his service. [MEDIA=youtube]fn_hw9C-o4M[/MEDIA] )</p><p><br /></p><p>The Princeton team working on computer die matches constructs a 3D model of the coin. This is discussed in the ANS video ... I have some unpublished tech reports with more data. There approach would be the best if museums and dealers routinely made 3D scans of coins. Yet there are no such images, so Princeton's approach won't work ... yet.</p><p><br /></p><p>Humans can look at a coin and guess where the high points are. No one has done this yet with bas relief coin images. I predict that in the future the data that Princeton has will be valuable for creating a tool guesses a depth map of coins. That depth map will then be used to generate features.</p><p><br /></p><p>For an example of how a computer can guess the depth map of a single image, try <a href="https://cvl-demos.cs.nott.ac.uk/vrn/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://cvl-demos.cs.nott.ac.uk/vrn/" rel="nofollow">https://cvl-demos.cs.nott.ac.uk/vrn/</a> . If you are feeling ambitious you can take a coin with facing head, crop it to remove the coin border, and submit it to that site. The AI there will make a very freaky 3D of it.[/QUOTE]</p><p><br /></p>
[QUOTE="Ed Snible, post: 4726769, member: 82322"]Donna, even the same coin is hard to match against itself! With bas relief the light source angle makes a huge difference. The Ex-Numis provenance search only uses the edge of the coin when doing image matching for this reason. Even then, it still doesn't find everything. (Anyone interested in computer aided finding of provenance should watch Dr. Fleuck of Ex-Numis explain the ideas behind his service. [MEDIA=youtube]fn_hw9C-o4M[/MEDIA] ) The Princeton team working on computer die matches constructs a 3D model of the coin. This is discussed in the ANS video ... I have some unpublished tech reports with more data. There approach would be the best if museums and dealers routinely made 3D scans of coins. Yet there are no such images, so Princeton's approach won't work ... yet. Humans can look at a coin and guess where the high points are. No one has done this yet with bas relief coin images. I predict that in the future the data that Princeton has will be valuable for creating a tool guesses a depth map of coins. That depth map will then be used to generate features. For an example of how a computer can guess the depth map of a single image, try [URL]https://cvl-demos.cs.nott.ac.uk/vrn/[/URL] . If you are feeling ambitious you can take a coin with facing head, crop it to remove the coin border, and submit it to that site. The AI there will make a very freaky 3D of it.[/QUOTE]
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