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<p>Hi, <br>
</p>
<p>I'm a relatively new user of DigiKam, and so far quite pleased
with the program!<br>
</p>
<p>However I am struggling to master DigiKam's face detection and
recognition. Mostly, these issues relate to the set of images to
which Recognition is to be applied. Here are a couple of cases
that have me puzzled:<br>
</p>
<ol>
<li> Selected unknown faces do not get recognized.<br>
</li>
<ol>
<li>I have a (large) number of faces in the Unknown people tag.
<br>
</li>
<li>I select several face thumbnails of the same person. This
person's face has already been tagged 147 times (i.e. the tag
tree shows 147 entries for this person).<br>
</li>
<li>I press "recognize faces" in the workflow tab of the people
view <br>
</li>
<li>i press "scan for faces" in the Item menu. (I would have
expected to see a recognize face menu entry, but there is
none).</li>
<li>I dialog appears saying the right number of images were
scanned, but no faces were recognized, and they remain in the
unknown tag.</li>
<li>Why is this happening?</li>
<li>the same thing happens if I select "recognize faces" from
the context menu in step 4.</li>
</ol>
<li>I foolishly (in hindsight) moved a bunch of faces from the
unknown tag to a temporary "test" tag that I created. </li>
<ol>
<li>I moved most of the tags in unknown to a new temporary tag</li>
<li>I then did face recognition. <br>
</li>
<li>I then moved the faces in the temp tag back to unknown</li>
<li>when I tried to recognize those faces, they all suggested
"temp" (makes sense in hindsight)<br>
</li>
<li>I deleted the temp tag.</li>
<li>when I tried to recognize those faces again, the still
suggested "temp".</li>
<li>Hence I presume that DK did not remove the face recognition
data associated with the deleted tag....</li>
<li>How can I make DK <b>forget</b> a face? Just some. Not
all.</li>
</ol>
<li>A lot of the faces I have detected and recognized to date are
of poor quality. For example, blurry, pixelated, taken from
almost behind the person, etc. While I am impressed with DK's
ability to detect that these are indeed faces, I have read that
poor quality training data make for bad recognition. <br>
</li>
<ol>
<li>for the purpose of finding people in my collection, I would
like to tag even the bad images.</li>
<li>for the purpose of good training data, it seems I should
only tag good images</li>
<li>How do I accomplish both?</li>
<li>BTW, I believe that the "accuracy" setting (sensitivity
<-> specificity) is not well named. With respect to
detection, I would suggest "aggressiveness" (cautious
<-> aggressive), or (false positives (fewer <->
more).<br>
</li>
<li>I am not sure what this setting means w.r.t. recognition.</li>
</ol>
<li>In the "search-in" tab, if I specify albums and also specify
tags, is the domain of the search the intersection of those two
specifiers (and), or is it the union (or)?<br>
</li>
<li>My goal is to detect and recognize faces incrementally, as I
am processing a collection of images (approx 90k images)
captured over many years. I am hoping to effectively partition
the unknowns by other selection criteria.</li>
</ol>
<p>Running DK 8.2.0 on Win 11 Pro 23H2</p>
<p>Thanks in advance!<br>
</p>
<pre class="moz-signature" cols="72">--
George Koulomzin
7 Bridge Hill Lane,
PO Box 781
Bridgehampton, NY, 11932
(m) 914-393-6179
(h) 631-537-4956
<a class="moz-txt-link-abbreviated" href="mailto:George@Koulomzin.com">George@Koulomzin.com</a></pre>
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