<div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div>I've heard that fprint matching doesn't work well with small sensors.</div><div><br></div><div>In my case (<a href="https://gitlab.freedesktop.org/libfprint/libfprint/-/issues/162" target="_blank">issue #162</a>), the device returns 114x57 images and there is probably not much minutiae to extract. I am certain that it is a press sensor, even though it returns multiple images during communication. Despite the fact that it's hard to find any specification for the device, <a href="https://www.youtube.com/watch?v=FgbYrSOy3oQ" target="_blank">Acer Swift 3 promo</a> shows exactly that.<br></div><div><br></div><div>When running enroll and then verify examples, I get "score 0" on every verify.<br></div><div><br></div><div>Basically, my questions are:</div><div><ol><li>Is this a small sensor problem and is there really too little minutiae?<br></li><li>What is the state of small sensors matching? Are there any working drivers for small sensors?<br></li><li>How much minutiae is enough to work?</li><li>In my driver code, how can i check minutiae count <i>before</i> calling fpi_image_device_image_captured, for example, to prevent submitting images with low minutiae count?</li><li>What are other options to make my device work, maybe by using multiple images?<br></li></ol></div></div>
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