Electrographic system and method

In an electrographic system wherein a surface is selectively accessed to develop electrical signals which are treated to provide outputs corresponding with the accessed position, the method of correcting the value of given said outputs, comprising:

• providing a memory for retaining computed physical domain coordinate values derived as values corresponding with select said outputs of a signal domain and established for each position within a predetermined grid array of pre-established positions of said physical domain, adjusted to establish a regularly incremented sequence of address values within said signal domain;
• deriving a said address value from a said given output;
• accessing said memory at said address value to provide a computed physical domain coordinate value corresponding therewith;
• adjusting the value of said accessed computed physical domain coordinate value by a two dimensional interpolative weighting thereof in correspondence with said given output to derive a corrected said given output;
• and
• outputting said corrected given output to provide coordinate information representing said accessed position at said surface.

In an electrographic system wherein a surface of known geometric configuration is selectively accessed to develop electrical signals which are treated to provide outputs corresponding with the accessed physical position, the method of correcting the value of given said outputs with respect to variations of said surface comprising the steps of:

• determining, within a physical domain, a grid array of physically locatable positions over said surface;
• deriving, within a signal domain, said electrical signals and corresponding outputs with respect to each said array position of said physical domain;
• deriving, within said signal domain, a regularly incremented sequence of address values;
• determining physical domain coordinate values corresponding with each of said address values;
• recording said physical domain coordinate values in conjunction with corresponding said address values;
• deriving a correction said address value from a said given output;
• accessing said memory at said correction address value for said physical domain coordinate values corresponding therewith;
• adjusting the value of said physical domain coordinate values by select dimensional interpolative weighting thereof in correspondence with said given output to derive a corrected said given output;
• and
• outputting said corrected given output to provide coordinate pair information representing said locator physical position.

In a system wherein a resistive surface is positionally accessed to evolve position outputs in a signal domain with respect to a predetermined array of grid locations within the physical domain of said surface, the method for correcting said position outputs comprising the steps of:

• providing a memory for retaining computed physical domain coordinate values derived as values corresponding with select said outputs of said signal domain and established for each position within a predetermined grid array of pre-established positions of said physical domain, adjusted to establish a regularly incremented sequence of address values within said signal domain;
• deriving a said address value from said given output;
• accessing said memory at said address value to provide a computed physical domain coordinate value corresponding therewith;
• adjusting the value of said accessed computed physical domain coordinate value by a selectively dimensional interpolative weighting thereof in correspondence with said given output to derive a corrected said given output;
• and
• outputting said corrected given output to provide coordinate information representing the location of said positional access of said surface.

The method for generating a memory retained look-up table for use in interpolatively correcting the position outputs in a signal domain corresponding to accessed locations within the physical domain of a resistive surface, comprising the steps of:

• collecting an input data set from said surface representing physical and signal domain characteristics of said surface;
• determining the bounds of said input data set as maximum and minimum signal domain values for first and second coordinate directions;
• deriving first and second sets of regularly incremented address locatable values extending between said maximum and minimum signal domain values corresponding, respectively, with said first and second coordinate directions;
• providing a first estimate of the physical domain coordinate location values on said surface corresponding with said address locatable values for each said first and second coordinate directions;
• deriving from said first estimate and adjacent values of said input data set interpolated said physical domain coordinate location values for each said first and second coordinate directions;
• and
• positioning said interpolated physical domain coordinate location values in said memory in combination with corresponding said signal domain address locatable values.

In an electrographic system wherein a surface of known geometric configuration is selectively accessed to develop electrical signals which are treated to provide outputs corresponding with the accessed physical position, the method of correcting the value of given said outputs with respect to variations of said surface comprising the steps of:

• collecting an input data set from said surface representing physical and signal domain characteristics of said surface;
• determining the bounds of said input data set as maximum and minimum signal domain values for first and second coordinate directions;
• deriving first and second sets of regularly incremented address locatable values extending between said maximum and minimum signal domain values corresponding, respectively, with said first and second coordinate directions;
• providing a first estimate of the physical domain coordinate location values on said surface corresponding with said address locatable values for each said first and second coordinate directions;
• deriving from said first estimate and adjacent values of said input data set interpolated said physical domain coordinate location values for each said first and second coordinate directions;
• positioning said interpolated physical domain coordinate location values in memory in combination with corresponding said signal domain address locatable values;
• deriving a correction address locatable value from a said given output;
• accessing said memory at said correction address locatable value for said physical domain coordinate location values corresponing therewith;
• adjusting the value of said physical domain coordinate location values by select dimensional interpolative weighting thereof in correspondence with said given output to derive a corrected said given output;
• and
• outputting said corrected given output to provide coordinate pair information representing said locator physical position.