06. CIE standards - 2011

06. CIE standards - 2011 - ECE 638 Principles of Digital...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ECE 638: Principles of Digital Color Imaging Systems Lecture 6: CIE Standards Synopsis Brief review of primaries Chromaticity diagram for primaries Overview of CIE Photometry and relative luminous efficiency function CIE 1931 standard observer – RGB form – XYZ form Review: Primary mixture and sensor response R P = P ( λ ) Q R ∫ ( λ )d λ G P = P ( λ ) Q G ∫ ( λ )d λ B P = P ( λ ) Q B ∫ ( λ )d λ P ( λ ) = p R P R ( λ ) + p G P G ( λ ) + p B P B ( λ ) C P = R P G P B P ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ , p = p R p G p B ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ A = a ij ⎡ ⎣ ⎤ ⎦ , a ij = P j ( λ ) Q i ∫ ( λ )d λ , i , j = R , G , B C P = A p Review: Match equation Response to test stimulus Match amounts of primaries R T = T ( λ ) Q R ∫ ( λ )d λ G T = T ( λ ) Q G ∫ ( λ )d λ B T = T ( λ ) Q B ∫ ( λ )d λ C T = R T G T B T ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ p = A − 1 C T Review: Color matching functions Given primaries , let denote the amount of these primaries required to match the stimulus for each fixed wavelength . Thus, we have – where , – the matrix is given as before, – and Combining these results, we obtain P R ( λ ), P G ( λ ), P B ( λ ) [ ] r ( μ ), g ( μ ), b ( μ ) [ ] δ ( λ − μ ) μ A − 1 r ( μ ) g ( μ ) b ( μ ) ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ = A − 1 Q R ( μ ) Q G ( μ ) Q B ( μ ) ⎡ ⎣ ⎢ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎥ p = A − 1 C T p = r ( μ ), g ( μ ), b ( μ ) ⎡ ⎣ ⎤ ⎦ T C T = Q R ( μ ), Q G ( μ ), Q B ( μ ) [ ] T Review: Computation of match amounts for an arbitrary stimulus Consider arbitrary stimulus Match amounts are given by This looks like a sensor T ( λ...
View Full Document

This note was uploaded on 02/19/2012 for the course ECE 638 taught by Professor Staff during the Fall '08 term at Purdue.

Page1 / 27

06. CIE standards - 2011 - ECE 638 Principles of Digital...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online