Comparametric Equations, Photoquantigraphic Imaging

• Want to work linearly on images
• Retroactive gain change
• linearly superimpose images

Need to correct for camera's dynamic compression

• Must find compression function and dynamically uncompress the image to work in linear "lightspace"

Use multiple images of different exposures

Use this a data to generate a "comparagram"

• Uses the homogeneity (linear quality) of light
• The camera noise around the comparagram must be reduced to allow a function to be formed
• This yields a comparagraph

Solve this using:

• Comparametric equations
• Log unrolling
• Superposimetric methods (complete linearity)

Comparametric analysis and synthesis:

CEMENT (Computer Enhanced Multiple Exposure Numerical Technique):

Next: Using superposition for quantimetric analysis