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<p>[QUOTE=&quot;Theodosius, post: 5474021, member: 77077&quot;]I am a big fan of acsearch for identifying and researching coins. I am not sponsored by acsearch but if they want to fly me to auctions in Europe to promote their brand I am here waiting by the phone. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>I have just started using their image search tool with no luck so far finding matches for my coins.&nbsp; </p><p><br /></p><p>Just for grins, I took an image (not my coin) from one of their own search results and submitted it, to see if they would find it.&nbsp; I did not doctor the image at, just uploaded the (lower resolution) image here:</p><p><br /></p><p>[ATTACH=full]1238478[/ATTACH] </p><p><br /></p><p>Low and behold, they found three matches for this coin.&nbsp; The original entry I took the image from and 2 more, including one with a much lower quality photo with a different edge shape that is clearly not the same coin. The first hit got a high confidence score (9.8), it is the same image after all. The second hit got a lower confidence score (6.8) and I believe it is the same coin as well. The third hit got a low score (3) and it is clearly not the same coin, although similar in some ways.</p><p><br /></p><p>[ATTACH=full]1238486[/ATTACH] </p><p><br /></p><p>This experiment cost 1 euro to carry out. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>OK, lets make this a little harder and see what happens.&nbsp; I took the original image and rotated the obverse 5 degrees one way and the reverse 5 degrees the other way, so it looked like this:</p><p>[ATTACH=full]1238489[/ATTACH] </p><p>Still found the two matches that are the same coin, but with less confidence.</p><p><br /></p><p>[ATTACH=full]1238490[/ATTACH] </p><p><br /></p><p>I&#039;d say that is not an unexpected result.&nbsp; This test cost another euro to run.</p><p><br /></p><p>I could keep distorting this image until I am out of credits but for now my curiosity is satisfied that their search engine is pretty sophisticated.</p><p><br /></p><p>Using their own image is obviously not a the best test case.&nbsp; It would be better to take my own photo of a coin illustrated in a catalogue I know they index and see if they find it.&nbsp; Maybe I will try that next.</p><p><br /></p><p>What are your experiences with this and other image search engines?</p><p><br /></p><p>John[/QUOTE]</p><p><br /></p>

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