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EE 193 Imaging systems: Image representation + MATLAB Steven Bell - - PowerPoint PPT Presentation
EE 193 Imaging systems: Image representation + MATLAB Steven Bell - - PowerPoint PPT Presentation
EE 193 Imaging systems: Image representation + MATLAB Steven Bell 12 September 2019 Image representation How should we encode brightness? 8-bit integers 16-bit integers 32-bit integers? 64-bit? fl oating point (32 bits) double-precision fl
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How should we encode brightness?
8-bit integers 16-bit integers 32-bit integers? 64-bit? floating point (32 bits) double-precision floating point (64 bits) 1-bit integers? half-precision floating point? (16 bits)
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Which side of the screen is brighter? (or are they the same?)
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(Enroth-Cugell et al. 1977, via Wandell)
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(absolute intensity)
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Intensity vs encoded value
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Gamma correction
When a camera captures an image, intensities are gamma-encoded: When you display this image, the display decodes the gamma: Typical value is
V = AI
1/γ
I = (V/A)
γ
γ=2.3
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For Tuesday
Homework 1 is due in class
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