Integrating Spectral and RTI

Guide to Filenames

Experimental Methods Filenames

The basic structure for filenames is creation date, object, (kind of illumination optional), angle of illumination, rendering, channels, camera, and variants separated by hyphens. The example 20140218-Pal1-99-Xepn-04-50m-n.ptm could be read as file created on February 18, 2014, object Palimpsest 1, unlimited angles of illumination, Extended Spectrum using Eureka lights, PCA, normalized, four channels (LRGB), 50 megapixel camera, normalized, polynomial texture map.

Creation date is the date of capture for capture files and for PCA only files, but the date of generation for additionally processed files.

The object code is always four characters

• Pal1 is the UCLA Palimpsest, first page imaged.
• Mask is the painted mummy mask.
• Sold is the terracotta figurine of the conquering and conquered soliders.
• Ant2 is the antiphonary, second folio.
• Ant3 is the antiphonary, additional folio (not included in summary).
• Pal3 is the UCLA Palimpsest, third page imaged (not included in summary).
• Spec is spectralon reference object (not included in summary).

The kind of illumination is always three characters.

• 045 refers to the combination of light taken from the Eureka lights and flash at 35 angles (45 represents the number of illuminations, 35 flash plus 10 [actually 11] bands from the Eureka lights).
• 324 refers to the combination of light taken from the Magic Flashlight, 9 bands at 35 angles (actually 315 angles but convention of using 324 established with 36 angles planned).
• 393 wavelength in nanometers (ultraviolet narrow band)
• 399 wavelength in nanometers (ultraviolet narrow band)
• 446 wavelength in nanometers
• 478 wavelength in nanometers
• 507 wavelength in nanometers
• 529 wavelength in nanometers
• 597 wavelength in nanometers
• 624 wavelength in nanometers
• 660 wavelength in nanometers
• 830 wavelength in nanometers (infrared narrow band)
• Fla Flash (Xenon tube)
• Whi White LED

The angle of illumination is always two digits.

• 00 refers to the diffuse light from Eureka lights.
• 01-35 refers to the angles of illumination ranging from nearly direct (01-05) to steeply raking (31-35).
• 99 refers to files that consolidate information from angles 01-35.

Rendering is always four characters

• Accc refers to accurate color
• Acce refers to accurate color generated from a combination of the Eureka lights and the flash.
• Accm refers to accurate color generated from the Magic Flashlight.
• Xepn refers to Extended Spectrum rendering generated from the Eureka lights using principal component analysis on three separate ranges of wavelengths and normalized.
• Xmpn refers to Extended Spectrum rendering generated from the Magic Flashlight using principal component analysis on three separate ranges of wavelenghts and normalized.
• Pepl refers to pseudocolor with the Eureka lights processed using PCA based on local stats.
• Pepg refers to pseudocolor with the Eureka lights processed using PCA based on global stats.
• Pmpl refers to pseudocolor with the Magic Flashlight processed using PCA based on local stats.
• Pmpg refers to pseudocolor with the Magic Flashlight processed using PCA based on global stats.
• Peil refers to pseudocolor with the Eureka lights processed using ICA based on local stats (available in data archive for Pal1).
• Peig refers to pseudocolor with the Eureka lights processed using ICA based on global stats (available in data archive for Pal1).
• Pmil refers to pseudocolor with the Magic Flashlight processed using ICA based on local stats (available in data archive for Pal1).
• Pmig refers to pseudocolor with the Magic Flashlight processed using ICA based on global stats (available in data archive for Pal1).

Channels is always two digits.

• 01 refers to a monochrome image.
• 03 refers to an RGB image (intermediate YCbCr or LAB images generally not stored).
• 04 refers to an LRGB Polynomial Texture Map.

Only one camera identifier is used in for this project in this convention. The conventional RTI control method filenames (above) do not identify the camera explicitly.

• 50m refers to the 50 megapixel MegaVision camera.

Many variants were tested and are distinguished only by appearing at the end of the filename before the file extension.

• 001-011 in the capture files is the index of capture sequence.
• n refers to normalization.
• w refers to normalization based on the whole field of view.
• m refers to normalization based on the macbeth chart.
• 120 or another three digit number greater than 100 refers to luminance magification, in this case multiply pixel values by 1.2 (similarly 250 multiplies by 2.5, 175 multiplies by 1.75).
• 300x300 or any numbers separated by "x" refer to the image dimension in pixels for a non-standard crop, in this case a 300 by 300 pixel thumbnail.
• rgb210 refers to variant pseudocolor generated by mapping the third (#2) principal component to the red channel in an RGB image, the second principal component (#1) to the blue channel, and the first principal component (#0) to the blue channel.
• yccf01 refers to a variant pseudocolor generated by mapping the flash capture to the Y (luminance) channel in a YCbCr image, the first principal component (#0) to the Cb channel, and the second principal component (#1) to the Cr channel.

File extensions

• .tif uncompressed tagged image format used for archives
• .jpg compressed jpeg used for Internet summary distribution and as intermediate stage required by polynomial texture map fitter.
• .ptm polynomial texture map (experimental .hsh [hemispherical harmonics] or .rti [reflectance transformation imaging with hemispherical harmonics] appear among the tests in the complete archive.
• .ijm ImageJ Macro
• .dng Digital Negative Format used initially by Photoshoot software, always accompanied by an open archive in tiff format.

Conventional Spectral Imaging Control Method Filenames

Additional conventions are used by William Christens-Barry in the creation of the spectral imaging control set.

• WCB refers to William Christens-Barry.
• F refers to flattening.
• N refers to normalized (sometimes at more than one stage of processing).
• ne or nE refers to negative eigenvalues permitted in principal component analysis.
• combi refers to combinatorial processing of pseudocolors.
• PSE or PSU refers to pseudocolor.
• 01-02-03-04-05 refers to experiments working from principal components 1-5.

Conventional RTI Control Method Filenames

The conventional RTI files created by the West Semitic Research Project at the University of Southern California have not been renamed.

• UCLA_Rouse_MS32_131R_v3_cropped_3019.ptm University of California Los Angeles Rouse Manuscript 31, folio 131 recto, version 3, cropped to a width of 3019 pixels, polynomial texture map format.
• USC7498_Mummy_Mask_cropped_2107.ptm University of Southern California catalog number 7498 (Mummy Mask) cropped to a width of 2107 pixels, polynomial texture map.
• USC10663_Smiting_Warrior_cropped_2690.ptm University of Southern California catalog number 10663 (Smiting Warrior) cropped to a width of 2690 pixels, polynomial texture map.
• Flewelling_Antiphonary_F2Recto_LRGB2559.ptm Flewelling Antiophonary Folio 2 Recto, LRGB format, 2559 pixel width, polynomial texture map.