Re: Multi-Touch Screen Monitors


Subject: Re: Multi-Touch Screen Monitors
From: Richard Wentk (richard@skydancer.com)
Date: Wed Oct 26 2005 - 10:57:52 EDT


At 15:41 26/10/2005, you wrote:
>My mouse pointer is two pixels by two pixels, my finger is 38 by 51 (give
>or take a couple of years). It's possibly a hammer replacing a jeweler's
>screwdriver.

It's not impossibly hard to add movement analysis and intrapolation to get
a more-or-less single pixel fix from a blobby finger.

Also if the cursor is being used to control a slider or dial, you only need
enough precision to make the movement feel natural. (Which is what the
Lemur does. The Lemur's physical touch resolution is much lower than the
pixel resolution of the display.)

In practice you hardly ever, if at all, need pixel-accurate two-axis
location from an on-screen cursor. Usually you can quantise it to some
near-enough variant that matches the controls or information on the display.

Richard



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