System for modeling a color imaging device
AssigneeEastman Kodak Company
InventorsDouglas G. Walker, H. Scott Gregory, Robert F. Poe
Life of this patent
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Abstract
A system is disclosed that extends a high order polynomial model of an input device into a device region where measured input data is not available by selecting points in an unmeasured region, determining a slope at each of the selected points using a lower order model, and fitting the higher order model to the measured values and the slope values.
Claims15
A method of producing a model for measured input data describing color characteristics of a color device, comprising:
- generating a set of extended input data values which extend beyond the measured input data;
- estimating slope values at the extended input data values;
- and
- fitting a model to the combination of the measured input data and the slope values.
A method of producing a model for measured input data describing color characteristics of an imaging device, comprising:
- fitting an initial model to the measured input data;
- selecting a set of extended input data values which extend beyond the measured input data;
- using the initial model to estimate slope values at the extended input data values;
- and
- fitting a model to the combination of the measured data and the slope values.
A method of creating a device model of a color peripheral device, comprising:
- measuring characteristics of the device and creating a first model of the device using a model fitting procedure;
- and
- using projected slope value information from the first model and measured characteristics as inputs to the fitting procedure to produce a second model better describing unmeasured aspects of the device.
A method of creating a device model of a color peripheral device, comprising:
- measuring characteristics of the device and creating a first model of the device using a model fitting procedure;
- and
- using information from the first model and measured characteristics as inputs to the fitting procedure to produce a second model better describing unmeasured aspects of the device the information from the first model describes partial derivatives of the second model.
A method of creating a high-order device model of a color peripheral device, comprising:
- generating a measured low-order model basis function matrix from a low-order model of the device having an order lower than the order of the high-order model and measured input data for the device;
- determining a weight matrix for the measured input data;
- producing a low-order polynomial coefficient matrix using the weight matrix, the measured output data, the measured low-order model basis function matrix and a least squares fitting procedure;
- creating a high-order partial derivative basis function matrix using unmeasured device input data;
- generating a low-order basis function matrix and the unmeasured device input data;
- producing slope estimates at the unmeasured input data points using the low-order basis function matrix and the low-order model coefficient matrix;
- generating a high-order basis function matrix for the measured device input data;
- and
- determining a high-order model coefficient matrix using the high-order basis function matrix, the weight matrix, the slope estimate, the high-order partial derivative basis function matrix, and a constant and the least squares fitting procedure.
A method of creating a device model, comprising:
- determining a slope of a first model in an unmeasured region where unmeasured device data exists;
- and
- using measured device data and the slope to create a second model.
A computer readable storage medium for controlling a computer and including a procedure creating a high-order device model of a color peripheral device by measuring characteristics of the device, creating a low-order model of the device using a model fitting procedure, and producing an extended model into unmeasured regions using a slope of the low-order device model and the measured characteristics as inputs to the fitting procedure.
An apparatus, comprising:
- an input device imaging a color target having known colorimetric values and producing measured target values;
- and
- a computer generating a set of extended input data values which extend beyond the measured target values, estimating slope values at the extended input data values, and fitting a model to the combination of the measured input data and the slope values producing a model of the input device.
Dependencies are inferred from the claim text.