Text Recovery from the Archimedes Palimpsest An Exercise in Digital Image Processing
Contents
Archimedes
Among Archimedes’ Accomplishments...
Most Famous Achievement
The “Archimedes Palimpsest”
Creation of the Palimpsest
Archimedes Palimpsest
Reading the Original Writing
1 Color Image = 3 B&W Images
Color in Digital Images
This Exercise:
Tools Required:
Make an Inkjet “Palimpsest”
Palimpsest Examples
Create Digital Image of Palimpsest
Two Processing Methods
(1) Simple Calculation
(1) Separating the Texts:
(1) Read the Image “Gray Values”
(1) Measurements of Gray Values
(1) Select Two “Colors”
(1) Contrast: “Paper” & “Overwriting”
(1) “Splitting” Color Image Into RGB
(1) Save Files
(1) Calculations in Image2000
(1) Calculate the Processed Image
(1) Output Image
(1) If it did not work…
(2) More Sophisticated Processing
(2) Example of More Sophisticated Processing
(2) Matrix of Measurements
(2) Example of Pixel Output
(2) Example of “Mixed” Pixel
(2) Inverse Operator
(2) Find “Inverse” Matrix Operator
(2) Scale Inverse Matrix
(2) Creating Temporary Image
(2) Apply Inverse Matrix to Pixels in Color Image - 1
(2) Apply Inverse Matrix to Pixels in Color Image - 2
(2) Apply Inverse Matrix to Pixels in Color Image - 3
(2)“Overwriting” Channel
(2)“Underwriting” Channel
(2) Rotate “Underwriting” Image
Conclusion
Archimedes Resources
Email: easton@cis.rit.edu
Home Page: http://www.cis.rit.edu/people/faculty/easton/