Patent ID: 7304482

Claim:
A method of characterizing a display having an arbitrary monotonic transfer function, comprising: a. generating an approximating spline through a plurality of control points using the steps of: 1. providing at least two known control points, wherein each control point has a display input value; 2. fitting a spline through the known control points; 3. creating a test point candidate list from combinations of the control points, wherein each test point candidate has a display input value, and has at least two parents selected from the known control points; 4. selecting a test point from the test point candidate list, and displaying the test point on a display; 5. generating a visual test pattern on the display using the test point's parents; 6. performing a visual comparison at the selected test point by adjusting the display input value of the test point until a perceptual match is made between the displayed test point and the displayed visual test pattern; 7. accepting an adjusted test point as a new known control point; and 8. repeating steps 2 through 7 at least once for further refinement of the approximating spline.