Method of achieving high color fidelity in a digital image...

Details Method of achieving high color fidelity in a digital image... Method of achieving high color fidelity in a digital image...

2006-05-09

2006-05-09

Nghiem, Michael (Department: 2863)

Data processing: measuring, calibrating, or testing

Calibration or correction system

Zero-full scaling

Reexamination Certificate

active

07043385

ABSTRACT:
A method for calibration of digital image capture devices is presented. This simplified method provides a calibration based on the human visual perception of the colors input into the device using simple test targets, measurement devices, and software with a minimum of labor and expertise. This analysis may be performed using the data analysis tools of a conventional electronic spreadsheet. The method normalizes the test target data to both black and white, and converts the normalized data into the color space of the capture device through white point adaptation. The raw captured image data is also normalized to both black and white, and is regressed with the converted, normalized target data to determine the expected measurement values. These values are used to compensate the device output to achieve a high level of color fidelity. To ensure that the level of fidelity is acceptable, the CIE color difference equations are used.

REFERENCES:
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patent: 6459825 (2002-10-01), Lippincott
patent: 6606395 (2003-08-01), Rasmussen et al.
patent: 6868190 (2005-03-01), Morton

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