Bradley P Stevenson

US Patent:

20020054026, May 9, 2002

Filed:

Apr 17, 2001

Appl. No.:

09/836877

Inventors:

Bradley Stevenson - Wilmington MA, US
Dan Winkler - Methuen MA, US
Ashley Woodsom - Allston MA, US
Travell Perkins - Cambridge MA, US

International Classification:

G09G005/00

US Classification:

345/173000, 345/179000, 345/581000

Abstract:

A method is provided for recording writing and audio from a writing session in a manner such that a depiction of the writing can be replayed in a synchronized fashion with the audio, the method comprising: recording movement of a writing element relative to a writing surface during a writing session using a writing capture device which produces writing data corresponding to positions of the writing element relative to the writing surface at sampled points in time; recording audio present during the writing session using an audio capture device to form audio data; associating time stamps with the writing and audio data; forming stroke vector data from the writing data by grouping the writing data into groups of temporally proximate writing data points based on the time stamps associated with the writing data, each group of temporally proximate writing data points defining a stroke vector that reflects a direction and magnitude of movement of the writing element relative to the writing surface over a period of time spanned by the writing data points in the group; and storing the time stamped stroke vector data and time stamped audio data to memory.