Pressure sensitive writing tablet, control method and control program therefor

A pressure sensitive writing tablet comprising:

• a touch panel for generating an output signal corresponding to a touch surface pressure distribution relating to touch locations where a writing stylus touched the touch surface;
• means for generating primary touch data including data on a primary touch location and a touch time for each touch of said writing stylus to said touch surface by sampling the output signal of said touch panel, determining if there was a touch of said writing stylus to said touch surface based on the sampled data, and, if there was a touch, detecting the touch location and touch time of said touch;
• means for determining, based on said primary touch data, whether each touch of said primary touch data is a touch on a contiguous line input on said touch panel;
• means for generating secondary touch data including data on a secondary touch location for each touch by computing the secondary touch location which is obtained from correcting, by a predetermined correction process, a primary touch location of a touch included in said primary touch data and located on the target touch contiguous line and defined as a target touch, based on primary touch locations of multiple touches defined as correcting touches herein having the respective touch times within a predetermined time range Ta including the touch time of said target touch;
• means for producing a line drawing connecting with a selected line the secondary touch locations of two touches that are on the contiguous line and temporally adjacent to each other in the detection order defined as adjacent touches;
• and,
• a display device for displaying the line drawing produced by said line drawing producing means.

A method for controlling a pressure sensitive writing tablet, comprising the steps of:

• generating an output signal corresponding to a touch surface pressure distribution relating to touch locations where a writing stylus touched the touch surface;
• generating touch data including data on a touch location and a touch time for each touch of said writing stylus to said touch surface by sampling said output signal generated by said output signal generating step, determining if there was a touch of said writing stylus to said touch surface based on the sampled data, and, if there was a touch, detecting the touch location and touch time of said touch;
• determining, based on said touch data, whether each touch of said touch data is a touch on a contiguous line input on said touch panel;
• generating velocity data by calculating, based on said touch data, a velocity of said writing stylus at each segment of the contiguous line input on said touch surface, said velocity data including data relating to the calculated velocities;
• determining, based on said velocity data, a type of a line connecting the touch locations of two touches that are on the contiguous line and temporally adjacent to each other in the detection order defined as adjacent touches, wherein said line type determining step sets, as a connecting line between two touch locations of adjacent touches, a line having a less curvature when the velocity of said writing stylus between said two touch locations on said touch surface is high than when the velocity is low;
• producing a line drawing connecting the touch locations of the respective adjacent touches based on the line types determined by said line type determining step;
• and
• displaying the line drawing produced by said line drawing producing step.

A method for controlling a pressure sensitive writing tablet comprising the steps of:

• generating an output signal corresponding to a touch surface pressure distribution relating to touch locations where a writing stylus touched a touch surface of a touch panel;
• generating primary touch data including data on a primary touch location and a touch time for each touch of said writing stylus to said touch surface by sampling the output signal of said touch panel, determining if there was a touch of said writing stylus to said touch surface based on the sampled data, and, if there was a touch, detecting the touch location and touch time of said touch;
• determining, based on said primary touch data, whether each touch of said primary touch data is a touch on a contiguous line input on said touch panel;
• generating secondary touch data including data on a secondary touch location for east touch by computing the secondary touch location which is obtained from correcting, by a predetermined correction process, a primary touch location of a touch included in said primary touch data and located on the contiguous line, defined as target touch, based on primary touch locations of multiple touches, defined as correcting touches, having the respective touch times within a predetermined time range Ta including the touch time of said target touch;
• producing a line drawing connecting with a selected line the secondary touch locations of two touches that are on the contiguous line and temporally adjacent to each other in the detection order, defined as adjacent touches;
• and
• displaying the line drawing produced by said line drawing producing step.

A control program for a pressure sensitive writing tablet, comprising the computer implemented steps of:

• generating an output signal corresponding to a touch surface pressure distribution relating to touch locations where a writing stylus touched the touch surface;
• generating touch data including data on a touch location and a touch time for each touch of said writing stylus to said touch surface by sampling said output signal generated by said output signal generating step, determining if there was a touch of said writing stylus to said touch surface based on to sampled data, and, if tore was a touch, detecting the touch location and touch time of said touch;
• determining, based on said touch data, whether each touch of said touch data is a touch on a contiguous line input on said touch panel;
• generating velocity data by calculating, based on said touch data, a velocity of said writing stylus at each segment of the contiguous line input on said touch surface, said velocity data including data relating to the calculated velocities;
• determining, based on said velocity data, a type of a line connecting the touch locations of two touches that are on the contiguous line and temporally adjacent to each other in the detection order, defined as adjacent touches, wherein said line type determining means sets, as a connecting line between two touch locations of adjacent touches, a line having a less curvature when the velocity of said writing stylus between said two touch locations on said touch surface is high than when to velocity is low;
• producing a line drawing connecting the touch locations of to respective adjacent touches based on the line types determined by said line type determining step;
• and
• displaying the line drawing produced by said line drawing producing step.

A control program for a pressure sensitive writing tablet, comprising the computer implemented steps of:

• generating an output signal corresponding to a touch surface pressure distribution relating to touch locations where a writing stylus touched a touch surface of a touch panel;
• generating primary touch data including data on a primary touch location and a touch time for each touch of said writing stylus to said touch surface by sampling the output signal of said touch panel, determining if there was a touch of said writing stylus to said touch surface based on the sampled data, and, if there was a touch, detecting the touch location and touch time of said touch;
• determining, based on said primary touch data, whether each touch of said primary touch data is a touch on a contiguous line input on said touch panel;
• generating secondary touch data including data on a secondary touch location for each touch by computing the secondary touch location which is obtained from correcting, by a predetermined correction process, a primary touch location of a touch included in said primary touch data and located on the contiguous line, defined as target touch, based on primary touch locations of multiple touches, defined as correcting touches, having the respective touch times within a predetermined time range Ta including the touch time of said target touch;
• producing a line drawing connecting with a selected line the secondary touch locations of two touches that are onto contiguous line and temporally adjacent to each other into detection order defined as adjacent touches;
• and
• displaying the line drawing produced by said line drawing producing step.