ToneMap - Tone Mapping for Realistic Image Display by...

Info iconThis preview shows pages 1–19. 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 Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: Tone Mapping: for Realistic Image Display by Sumanta Pattanaik What is Tone Mapping? display radiances scene display Tone mapping scene radiances pixels V i r t u a l c a m e r a Range of Illumination Absolute range of terrestrial illumination is vast. From 10-6 cd/m 2 to 10 8 cd/m 2 star light star light moon light moon light office light office light day light day light search light search light 10 10-6-6 10 10-2-2 10 101 10 102 10 104 10 108 ( 29 ( 29 λ λ λ λ d y sensitivit spectral radiance × × = ∫ = _ 683 Luminance 700nm nm 400 2 2 or : unit m cd m candela Range of Illumination Absolute and dynamic range of display is limited. From 1 to 100 cd/m 2 star light star light moon light moon light office light office light day light day light search light search light 10 10-6-6 10 10-2-2 10 101 10 102 10 104 10 108 What is Tone Mapping? How do we scale actual radiance values to display pixel value between 0-1 such that the display will look realistic? display intensities scene observer scene display display observer visual match? Display mapping scene intensities pixels V i r t u a l c a m e r a Example Brightly lit scene star light star light moon light moon light office light office light day light day light search light search light 10 10-6-6 10 10-2-2 10 101 10 102 10 104 10 108 Example Night time scene star light star light moon light moon light office light office light day light day light search light search light 10 10-6-6 10 10-2-2 10 101 10 102 10 104 10 108 Visual Experience: Color Day scene Night scene Visual Experience: Brightness Day Scene Night Scene Visual Experience: Visual acuity Night Scene Day Scene Visual Experiences • Color appearance Color appearance • Perceived brightness • Visual clarity Color Appearance • Rod-Cone System > Rod is more sensitive in scotopic illumination range. > Cone is more sensitive in photopic illumination range. log L log L a a (cd/m (cd/m 2 2 ) ) Sensitivity rod cone log Sensitivity 2 4 6-2-4-6 scotopic photopic mesopic Rod-Cone System Scene Image B-Cone Image G-Cone Image Rod Image R-Cone Image B Image G Image R Image + Rod-Cone System Cone dominated vision Rod dominated vision Rod-Cone System Wavelength (nm) Log Relative Efficiency 400 450 500 550 600 650 700 0.0001 0.001 0.001 0.1 Cones Rod Visual Experiences • Color appearance Color appearance • Perceived brightness • Visual clarity Visual Acuity Function log L (cd/m (cd/m2 ) Highest Resolvable frequency 10 20 30 40 50-4-3-2-1 1 2 3 Simulation of Visual Acuity • Acuity Based Filtering...
View Full Document

{[ snackBarMessage ]}

Page1 / 70

ToneMap - Tone Mapping for Realistic Image Display by...

This preview shows document pages 1 - 19. Sign up to view the full document.

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