- This page is about the Palm OS handwriting system. See Graffiti for the wall markings.
A chart of the Graffiti characters (full size)
Graffiti is the handwriting recognition software used in PDAs based on graffitialphabet the Palm OS. Graffiti was originally written by Palm, Inc. as an alternate recognition system for the grafiti alphabet Apple Newton MessagePad, when NewtonOS 1 couldn't recognize handwriting very well at all. Graffiti also runs on the Windows Mobile platform, where it is called "Block Recognizer," and on the Symbian UIQ graffiti alphbet platform as the default recognizer.
The software is based primarily on a neography of upper-case characters that can be drawn blindly with a stylus on a touch-sensitive panel. Since the user typically cannot see graffitti alphabet the character as it is being drawn, complexities have been removed graffiti alphebet from four of the most difficult letters. "A'" "F", "K" and "T" all are drawn without any need to match up a cross-stroke.
The original Graffiti system was the subject graffiti elphabet of a lawsuit from Xerox, claiming it violated Xerox's patent relating to its Unistrokes technology (U.S. Patent 5,596,656, granted in 1997). The Unistrokes technology was invented at the Palo Alto Research graffiti alphabet Center (PARC) by David Goldberg. Palm got a demonstration of Unistrokes from PARC before they tag graffiti alphabet created their Graffiti system. During the original case, a court ruled that Palm violated Xerox's patent and ordered them to discontinue use of the original Graffiti system in alphabet in graffiti letters further versions of its Palm OS software, which Palm did. It replaced the original Graffiti system with a licensed variant of the Jot system from CIC, which Palm refers to as Graffiti 2. It differs from the original Graffiti system in various new graffiti alphabet ways, though it does recognize some of the original keystrokes (except can you show me some graffiti letters alphabet the input method for punctuation and "i", "k", "q", "t").
Palm later appealed the original court ruling both on the claim it violated Xerox's patent and as to the validity of the patent in the first place. alphabet for graffiti tagging An appeals court graffiti alphabets ruled in favor of Xerox with regard to the original ruling that Palm had violated its patent but sent the case back down to the lower court to decide whether the patent was valid to begin with. In 2004, a judge ruled in alphabet in graffiti form favor of Palm, saying Xerox's patent was not graffiti lettering styles in alphabet valid on the basis that "prior art references anticipate and render obvious the claim."
At least one alternative to Graffiti has been developed by Professor Ken Perlin of the University of New mr wiggles graffiti alphabet York
External links
- Palm's website on Palm OS handheld input
- Howto: Replace Graffiti 2 with Original Graffiti
- Quikwriting: an alternative to free graffiti alphabet Grafitti
Categories: Input/Output | PDA software
