Writing input and dynamics regeneration device
First Claim
1. A writing dynamics input device comprising:
- marking means for producing marking transfers on a surface;
writing stylus means comprising said marking means adapted for positioning said marking transfers on said surface in a writing path traversed in accordance with writing thereby producing a sequence of said marking transfers on said surface arranged in a configuration corresponding to said writing path, wherein said marking transfer sequence comprises first information manifested in the spatial configuration thereof;
time code means for generating a time code sequence having output values comprising second information related to advancing time;
modulation means for modifying a characteristic of said marking transfers in accordance with said time code sequence and simultaneously to the generation of said writing, thereby producing a sequence of modified marking transfers on said surface arranged in said writing path, said modified marking transfer sequence characterized by said first information manifested in said spatial configuration thereof and said second information manifested in said characteristic modifications of said marking transfers therewithin, whereby a time relationship between said marking transfers and said second information is produced, said time relationship relating to the dynamics of said writing.
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Abstract
A handwriting input method and apparatus for recreating handwriting dynamics. A time dependent code is first embedded in the writing path then later, after-the-fact, said code is detected by processing a digital representation of the writing image. Writing coordinates vs. associated time is decoded therefrom. After-the-fact writing position, velocity, and acceleration is derived from this data which can then be further processed by handwriting recognition and signature authentication devices. A code generating stylus is used to modify writing indicia by modulation of the writing markings thereby embedding time code information within the writing path. The modulated writing is generally uniform when viewed macroscopically but microscopically the embedded code becomes perceivable.
75 Citations
17 Claims
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1. A writing dynamics input device comprising:
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marking means for producing marking transfers on a surface; writing stylus means comprising said marking means adapted for positioning said marking transfers on said surface in a writing path traversed in accordance with writing thereby producing a sequence of said marking transfers on said surface arranged in a configuration corresponding to said writing path, wherein said marking transfer sequence comprises first information manifested in the spatial configuration thereof; time code means for generating a time code sequence having output values comprising second information related to advancing time; modulation means for modifying a characteristic of said marking transfers in accordance with said time code sequence and simultaneously to the generation of said writing, thereby producing a sequence of modified marking transfers on said surface arranged in said writing path, said modified marking transfer sequence characterized by said first information manifested in said spatial configuration thereof and said second information manifested in said characteristic modifications of said marking transfers therewithin, whereby a time relationship between said marking transfers and said second information is produced, said time relationship relating to the dynamics of said writing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A writing input device comprising:
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signal generating means for producing a digital time dependent signal; marking means for producing discrete markings on a surface in accordance with said digital time dependent signal; stylus means comprising said marking means for providing movement thereof over said surface in accordance with writing thereby producing coded writing markings on said surface comprising embedded time dependent information therewithin; first detection means for converting said coded writing markings to a spatial coordinate representation thereof; second detection means for detecting digital values and coordinates of said discrete markings from said spatial coordinate representation; data arrangement means for arranging said digital values and said coordinates in writing sequential order thereby producing writing sequential data; time decoding means for decoding said time dependent information from said writing sequential data thereby producing decoded time data relating the spatial coordinates of said coded writing markings with time thereof; and feedback means for providing feedback from said time decoding means to said data arrangement means whereby said time dependent information influences said writing sequential order by maintaining time continuity of said writing sequential data. - View Dependent Claims (13, 14, 15, 16)
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17. A writing input device comprising:
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signal generating means for producing a digital time dependent signal; error correction encoding means for encoding said digital time dependent signal thereby producing a modified digital time dependent signal; marking means for producing discrete markings on a surface in accordance with said modified digital time dependent signal; stylus means comprising said marking means for providing movement thereof over said surface in accordance with writing thereby producing coded writing markings on said surface comprising embedded time dependent information therewithin; first detection means for converting said coded writing markings to a spatial coordinate representation thereof; second detection means for detecting digital values and coordinates of said discrete markings from said spatial coordinate representation; data arrangement means for arranging said digital values and said coordinates in writing sequential order thereby producing writing sequential data; error correction decoding means for processing errors occurring in said writing sequential data, whereby said error correction decoding means corresponds to said error correction encoding means in a related inverse process, thereby producing corrected writing sequential data; and time decoding means for decoding said time dependent information from said corrected writing sequential data thereby producing decoded time data relating the spatial coordinates of said coded writing markings with time thereof.
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Specification