MEASUREMENT-BASED COLOR CORRECTION METHOD FOR

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MEASUREMENT-BASEDCOLOR CORRECTION METHODFOR 3D SCANNING SYSTEMSPEAKER: KAI-LIN CHANADVISOR: TZUNG-HAN LIN, HUNG-SHING CHENGraduate Institute of Color and Illumination Technology, NTUST CIT

1ØØØ

Personal Statue2VirtualReality3D ScanningSomething MemorableSpecificApplicationFetusAugmented Reality

Watch CI3D Scanner Video

33D Scanning eoLens ofStereoCameraCamera

43D Scanning Result Color Texture Images0 45 90 135 180 225 270 315

5Experiment RouteScanned3D ModelOne Lens of Stereo CameraColor TextureImages (Raw)X-riteColorCheckerCalibrationBall2D Colorimeter(Topcon UA-1000A)2D Colorimeter(Topcon UA-1000A)2D ColorCorrection3D ColorCorrectionCorrected3D ModelEvaluation

6

7

8Uniformity Correction

9Uniformity CorrectionRawWhite BoardColorCheckerUniformity

10Reference Values of ColorChecker

11Polynomial RegressionTopcon UA-1000A (Ref.)Uniformity CorrectionUnknown𝐴 24xN𝑀Nx3𝐵24x3[A] and [B] are normalized RGB, which is normalized to 0 1.

12Camera Color CorrectionThe 1st OrderUniformityPolynomialRegressionThe 2nd Order The 1st Order: [A] [R, G, B, K], K is constantThe 2nd Order: [A] [R2, G2, B2, RG, GB, RB, R, G, B, K], K is constant

132D Color Correction – Color Difference ComparisonRawUniformityCorrectionThe 1stOrderThe 2ndOrder25954ColorcheckerCalibrationBallΔE*94 ΔE*94 is calculated according to ColorChecker.

14What is Final Target?2D Color CorrectionTopcon UA-1000A (Ref.)Simulationu Polynomial Regressionu Look-up Table

15Polynomial Regression2D Color CorrectionTopcon UA-1000A (Ref.)Unknown𝐴 37xN𝑀[A] and [B] are stimulus values, Y.Nx1𝐵37x1

16Polynomial RegressionThe 1st Order2D Color CorrectionPolynomialRegressionThe 2nd Order The 1st Order: [A] [Y] The 2nd Order: [A] [Y2, Y]

17Look-up TableRatio Table

183D Color Correction – Color Difference ComparisonRaw2DC24.715.73D 1st3D 2nd(Luminance) E*94 15.515.0ΔE*94 is calculated according to calibration ball.2DC:2D Color Correction3D 1st: 3D Color Correction–1st Order Polynomial Regression3D 2nd: 3D Color Correction–2nd Order Polynomial RegressionLUT:3D Color Correction–Look-up Table0.5

193D Color Correction – Luminance Distribution Curvepixel 1pixel n

203D Color Correction – Contrast RatioRaw2DC16:13:13D 1st3D 2nd(Luminance) (Luminance)LUT(Color)Calibration BallContrastRatio3:12:12:1

21Overall of ResultsScanned3D Model2D ColorCorrection3D ColorCorrection(The 2nd Order)(Look-up Table)

22Ø Proposed Color Correction for 3D Scanning 2D Color Correction The 1st Order Polynomial Regression The 2nd Order Polynomial Regression 3D Color Correction The 1st Order 3D Color Correction The 2nd Order 3D Color Correction Look-up Table

23Ø 2D Color Correction Correction tool is ColorChecker Polynomial regression based on normalized RGB is better The 2nd order polynomial regression is better than the 1st orderØ 3D Color Correction Correction tool is calibration ball Look-up table method has the best performance of allØ All the correction can be applied onrealistic 3D scanned object well.

24Ø Different material of calibration ballfor 3D Color CorrectionØ High-end DSLR replaces 2D colorimeterto capture reference values

Picture Source at ges/products/sense/sense eardmillclinic.com/images/3d-4d-scans.png

3D Color Correction–1st Order Polynomial Regression 3D Color Correction–2nd Order Polynomial Regression 3D Color Correction–Look-up Table 24.7 15.7 15.5 15.0 0.5 18 ΔE* 94is calculated according to calibration ball. 3D Color Correction – LuminanceDistribution Curve pixel 1 pixel n

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