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Maintaining Color Consistency Across Non-Linear Devices

Maintaining Color Consistency Across Non-Linear Devices. Behzad Sajadi and Aditi Majumder Department of Computer Science, University of California, Irvine, Irvine, California, USA. Abstract

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Maintaining Color Consistency Across Non-Linear Devices

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  1. Maintaining Color Consistency Across Non-Linear Devices BehzadSajadiand AditiMajumder Department of Computer Science, University of California, Irvine, Irvine, California, USA Abstract We introduce a new color transformation representation based on higher-dimensional Bezier to maintain color consistency across non-ideal devices (like commodity printers and displays). Our color transformation is more accurate and artifact-free than existing methods. It is amenable to hardware implementation making it suitable for next generation commodity devices. sRGB to DLP Projector Color Matching Color Matching Across Multiple Cameras Our Method Projected Image Sample the input RGB color space uniformly (9x9x9=729 samples) Apply a 3x3 linear matrix to measured XYZ values. Apply a 1D non-linear function to samples from step 2. Approximate the forward transformation by three four-dimensional Bezier functions. Similarly, approximate the backward transformation by three four-dimensional Bezier patches. No Correction LAB Difference Objective Different input and output devices such as cameras, scanners, printers, displays, and projectors usually have different color gamuts. In order to maintain color consistency across a source and target device, a forward transformation first converts colors from the source color space to a device-independent color space (e.g. CIE XYZ). The colors in this color space are then converted to the target color space via a backward transformation. sRGB Image Our Method WCS Gamma Cor. Lin. 9x9x9 Lin. 16x16x16 -1 Xr YrZr XgYgZg XbYbZb Reparametrization Step 1 Printer to DLP Projector Color Matching Gamma Correction Projected Image Forward Transformation Backward Transformation Source Device Color Space Device Independent Color Space Target Device Color Space Reparametrization Step 2 Color transformation steps from source device to target device Our Method LAB Difference Input Output N Non-Ideal Devices T (r, g, b) (X, Y, Z) (X’, Y’, Z’) Printed Image Our Method WCS Gamma Correction N -1 • Three linearly independent primaries • No channel interdependencies • Channel chrominance constancy Ideal Devices Fc Color Matching Across Multiple Projectors Non-Ideal Real Devices: Does not follow the above properties. Bl N T (r, g, b) (X, Y, Z) (X’, Y’, Z’) N -1 LCD Projector LCoS Projector DLP Projector Fc Linear Interpolation (16x16x16) No Correction Gamma Correction Our Method Color gamut of projectors (shown in CIEXYZ space) are non-ideal.

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