Method for data compression and encoding

• US 20080086279A1
• Filed: 10/10/2006
• Published: 04/10/2008
• Est. Priority Date: 10/10/2006
• Status: Active Grant

• Current Assignee: Alcon Incorporated
• Original Assignee: Alcon Incorporated
• Inventors: Gary, Sorensen P., Svetic, Ralph E.
• Granted Patent: US 7,392,144 B2
• Time in Patent Office: Days
• US Class Current: 702/85
• CPC Class Codes: H03M 7/30 Compression speech analysis-synthesis for redundancy reduction G10L19/00; for image communication H04N; Expansion; Suppression of unnecessary data, e.g. redundancy reduction

Abstract

Systems and methods for compressing and encoding data are disclosed. According to one embodiment, a method is provided for communicating known calibration data for a microsurgical cassette to a surgical console with which the cassette will be used.

Claims

1. A method for generating a calibration data curve, comprising the steps of:

determining a first target value that corresponds to a predetermined coordinate of a first selected data point that corresponds to the data curve;

determining a second target value that corresponds to a predetermined coordinate of a second selected data point that corresponds to the data curve;

determining a predicted third target value based on the first target value, the second target value, and a first predetermined predictor function;

determining an actual third target value that corresponds to a predetermined coordinate of a third selected data point that corresponds to the data curve;

determining a first correction between the predicted third target value and the actual third target value;

determining a predicted fourth target value based on the first target value, the second target value, the actual third target value, and a second predetermined predictor function;

determining an actual fourth target value that corresponds to a predetermined coordinate of a fourth selected data point that corresponds to the data curve;

determining a second correction between the predicted fourth target value and the actual fourth target value; and

calculating a calibration data curve based on the first selected data point, the second selected data point, the third selected data point and the fourth selected data point.

2. The method of claim 1, wherein the first selected data point is on the data curve.

3. The method of claim 1, wherein the data curve is modeled using a fourth order polynomial.

4. The method of claim 1, wherein the first selected data point, second selected data point, third selected data point, and fourth selected data point are select calibration points, which determine a mathematical function modeling the data curve with greater accuracy, despite minor errors in the target values corresponding to the select calibration points, than other points corresponding to the data curve.

5. The method of claim 1, further comprising the step of communicating the first target value, the second target value, the first correction and the second correction on a linear barcode.

6. The method of claim 1, wherein the first selected data point and the second selected data point are predictor calibration points heuristically identified to more accurately predict remaining selected data point than other combinations of any two of the first, second, third, and fourth selected data points.

7. A method for identifying data needed to generate a calibration data curve, comprising:

determining an n^th order polynomial to model the data curve;

selecting a number n of select data points that correspond to the data curve, wherein the curve passes through a determinable point;

for each of the selected data points, identifying a target value that corresponds to the selected data point, wherein the target value is a coordinate value;

determining a predictor function that predicts a predicted target value based on a subset of the target values for the selected data points;

determining a correction between the predicted target value and an actual target value on the data curve,

generating a target data curve based on the polynomial, the target values for the subset of selected data points, the predictor function, and the correction; and

calculating a calibration data curve based on the target data curve.

8. The method of claim 7, wherein the determinable point is the origin.

9. The method of claim 7, wherein n is equal to four and the subset of target values for the selected data points comprises two target values.

10. A method of generating a calibration data curve, comprising the steps of:

encoding in a medium a first target coordinate along a first axis, wherein the first target coordinate corresponds to a first predetermined coordinate along a second axis, and wherein the first target coordinate and the first predetermined coordinate identify a predictor calibration data point;

encoding in the medium a correction between a predicted second target coordinate along the first axis and an actual second target coordinate along the first axis, wherein the actual second target coordinate corresponds to a second predetermined coordinate along the second axis, wherein the predicted second target coordinate is based at least in part on the predictor calibration data point, and wherein the actual second target coordinate and the second predetermined coordinate identify a second calibration data point;

wherein a mathematical function modeling the data curve is determined at least in part by the predictor calibration point and the second calibration point; and

generating a calibration data curve based on the determined mathematical function.

11. The method of claim 10, wherein the mathematical function is one of a polynomial, Fourier series, periodic function, exponential function, hyperbolic function, logarithmic function, or trigonometric function.

12. The method of claim 10, wherein the mathematical function is further determined by a boundary value condition.

13. The method of claim 12, wherein the boundary value condition includes the origin.

14. The method of claim 10, wherein the mathematical function is a fourth order polynomial, and further comprising encoding third and fourth calibration points, wherein one of the third and fourth calibration points is a second predictor calibration point, and wherein the data curve includes the origin.

15. The method of claim 10, wherein a linear predictor function of at least the first target coordinate is used to predict the predicted second target coordinate.

16. The method of claim 10, wherein a linear predictor function of the first target coordinate and a target coordinate for a second predictor calibration point are used to predict the predicted second target coordinate and wherein the first target coordinate, the target coordinate for the second predictor calibration point, and the actual second target coordinate are used to predict a fourth calibration point.

17. The method of claim 10, wherein the medium is a linear barcode.

18. The method of claim 17, wherein a great number of bits within the linear barcode are used to represent the predictor calibration point than are used to represent the correction.

19. The method of claim 10, wherein the first axis and second axis form at least part of a Cartesian coordinate system, spherical coordinate system, or polar coordinate system.

20. A method of generating a calibration data curve comprising:

identifying a first target value that corresponds to a predetermined coordinate of a first selected data point that corresponds to the data curve;

identifying a second target value that corresponds to a predetermined coordinate of a second selected data point that corresponds to the data curve;

calculating a predicted third target value based on the first target value, the second target value, and a first predetermined predictor function;

identifying a first correction between the predicted third target value and the actual third target value;

calculating an actual third target value that corresponds to a predetermined coordinate of a third selected data point that corresponds to the data curve based on the correction and the predicted third target value;

calculating a predicted fourth target value based on the first target value, the second target value, the actual third target value, and a second predetermined predictor function;

identifying a second correction between the predicted fourth target value and the actual fourth target value;

calculating an actual fourth target value that corresponds to a predetermined coordinate of a fourth selected data point that corresponds to the data curve;

determining the mathematical function modeling the data curve based on the first target value, the second target value, the first correction and the second correction; and

generating a calibration data curve based on the determined mathematical function.