<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - One-finger movement on touchpad registered as two-finger scrolling with edge exclusion zone is touched" href="https://bugs.freedesktop.org/show_bug.cgi?id=103208#c18">Comment # 18</a> on <a class="bz_bug_link bz_status_ASSIGNED " title="ASSIGNED - One-finger movement on touchpad registered as two-finger scrolling with edge exclusion zone is touched" href="https://bugs.freedesktop.org/show_bug.cgi?id=103208">bug 103208</a> from <a class="email" href="mailto:peteryuchuang@gmail.com" title="Peter Y. Chuang <peteryuchuang@gmail.com>"> Peter Y. Chuang</a> <pre>I want to expand a bit on the idea of using orientation to distinguish between a palm and a finger around the edges. I've uploaded two evemu-records. One of which is the recording of my left palm moving along the left edge and sideway within probably 1 or 2 cm from the left edge. The second is the recording of the same movements, but with one single finger. By my count (not sure if iI've counted correctly), when a palm touches the left edge, orientation is a positive number about 96% of the time. In my observation, orientation on the left edge is correct (i.e. positive) even when the contact point is very small and way before touch-size-based palm detection can kick in. When a finger touches the edge area, the result is less consistent. By my count, around 70% of time the orientation is not positive (i.e. either zero, negative, or nothing). Given touch-size-based palm detection is not possible around the edges, orientation may be helpful, even if not 100% reliable (mostly, a single finger would be falsely identified as a palm; a palm falsely identified as a finger is much less of a problem). Since most real touch inputs aren't initiated within, say, 3mm from the edge anyway, perhaps orientation-based palm detection doesn't have to be 100% accurate. If this could work good enough, perhaps tapping and tracking could be enabled within the edge exclusion zone. One of the downsides of it, other than being not 100% reliable, especially with single finger input, is that if one of the fingers in two-finger scrolling is placed within the zone where orientation-based palm detection is enabled, initiating two-finger scrolling will become less reliable too. I'm also not sure if those measures are good in other touchpads.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>