Haptic interface
First Claim
1. A method of calibrating a haptic interface comprising:
- outputting to a touchable device a signal to cause simulation of a first pattern,determining from user response to said simulation an index number for the first pattern,outputting to said touchable device at least one further signal causing simulation of at least one further pattern and determining from user response thereto a respective index number for each such further pattern to provide a set of user-specific index numbers, andcomparing the set of index numbers with a predetermined set of known index numbers representing a base exponent value to determine a mathematical parameter set defining user-specific correction factors to be applied to haptics signaling outputs, whereinthe correction factors determined define the Stevens exponent for the user.
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Abstract
Simulated textures whose parameters are held with object model data in a data store are modified in accordance with data held in data store which data defines a Gamma correction factor previously determined for each identified user. The gamma correction factor is determined by outputting to a Haptic Output interface a texture simulation including spaced grooves or ridges. By correlating user response to the perceived “feel” of the texture (rough, medium or smooth scale for example) the user'"'"'s perceptual factors can be determined. Subsequently applying the perceptual factors to effect a mathematical adjustment (power) of texture in simulation algorithms allows output simulations to be adapted so that each user has a corresponding perception of the simulated objects.
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Citations
13 Claims
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1. A method of calibrating a haptic interface comprising:
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outputting to a touchable device a signal to cause simulation of a first pattern, determining from user response to said simulation an index number for the first pattern, outputting to said touchable device at least one further signal causing simulation of at least one further pattern and determining from user response thereto a respective index number for each such further pattern to provide a set of user-specific index numbers, and comparing the set of index numbers with a predetermined set of known index numbers representing a base exponent value to determine a mathematical parameter set defining user-specific correction factors to be applied to haptics signaling outputs, wherein the correction factors determined define the Stevens exponent for the user. - View Dependent Claims (2, 3)
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4. A method of outputting control signals to a haptic output interface comprising:
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storing data defining signals to be output to cause the haptic output interface to simulate a display, recovering said data in response to user input, modifying the data by application of previously determined user-specific correction factors, and outputting signals determined by the modified data to cause the haptic output interface to provide a user-specific output so that perception of the output between users having differing correction factors is substantially similar, wherein said previously determined user-specific corrections factors are determined by; outputting to a touchable device a signal to cause simulation of a first pattern, determining from user response to said simulation an index number for the first pattern, outputting to said touchable device at least one further signal causing simulation of at least one further pattern and determining from user response thereto a respective index number for each such further pattern to provide a set of user-specific index numbers, and comparing the set of index numbers with a predetermined set of known index numbers representing a base exponent value to determine a mathematical parameter set defining user-specific correction factors, wherein the correction factors determined define the Stevens exponent for the user. - View Dependent Claims (5, 6)
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7. An apparatus for determining correction factors to be used in adaptation of haptic output signals, the apparatus comprising:
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a processor and a signal output unit coupled to a haptic output interface, the processor storing data defining a multiplicity of display effects, the processor being arranged to cause output of a series of signals defining known textures to the haptic output interface and to record a user'"'"'s reaction to said outputs, the processor determining from each said user'"'"'s respective reactions to said outputs a correction factor to be used with each of said stored display effects to allow the effects when displayed to be perceived as substantially similar to a previously known perception of the effects, wherein the correction factor defines the Stevens exponent for the user. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification