Weekly Update for April 2

Sample Slide

• High
• profile
• departures:
• 24

package x3ptools

• sorry I can’t be here in person … surprising soccer duty
• package x3ptools allows us to work with x3p files (topographic measurements in 3d): read, write, visualize, rotate, sample, interpolate, …
• see https://heike.github.io/x3ptools/
• the package is very close to be on CRAN
• we can successfully write x3p files for NIST

Progress on uploading files to NIST

• for bullet lands NIST wants to have files smaller than 5 MB
• at 20x magnification we are at 5.5 MB in x3p format
• therefore we down sample to a resolution of 1.29 microns per pixel
• next step: upload files to NIST
• problem: upload is one land at a time

Progress on DFSC

• protocol for individual cartridge case capture complete
• protocol for automated multi-cartridge case capture in the testing phase
• first set of cartridge cases scanned
• using private git LFS (large file storage) repository to (a) keep track of file versions and (b) exchange files with CMU

Literature Search

• 3D shoeprints, photogrammetry, 3D scanning tech
• I have killed approximately 1/20th of a tree in the last week.

Updates

• Draft of paper for intervals for random forest + extensions coming soon.
• Handwriting generation program on GitHub organization page.

REU

All 6 students we made offers to accepted! Here’s some info on them:

• All women: 1 ISU, 3 Albany State, 2 Fayetteville State
• Mean GPA is 3.53
• 5 of 6 wrote in their cover letter about interest in graduate degrees
• Majors: FS w/Bio. conc.; FS; Chem., minor in crim. just.; FS & Chem. double major; FS, minors in chem., crim. just.; FS, minor in Chem.

Application stats for comparison:

• 6 from ASU, 6 from FSU, 3 from ISU, 1 from Univ. Iowa.
• Mean GPA is 3.42 and median 3.42
• 13 female, 1 male.

Glass data

• Can discriminate between manufacturers with only 1 element.
• Is this element always different between manufacturers?
• Potential for easy ID of manufacturer of glass.
• Will start writing up what I learned this week.

Updates

Outreach
- Working on rounding out the first chapter of the book!
- To editor by early next week

Groove Identification - Starting a write-up of methods used already
- Linking currently running code with GitHub!
- Identifying characteristics that predict whether there are grooves on each side - Iteratively trimming based on that indicator - Compare robust linear model to rollapply based on trimmed values
- Submitting abstract to present at AFTE - thinking poster!

Updates

• Keep working on NIJ proposal with Martin, Soyoung and Alicia
• Adapt general renamer program in python by Jason to a very specific type of files
• Run another script that checks if the all the names are correct

Renaming

• Happy undergrad renaming files

Updates

Chumbley Score

• Running Simulations for all window sizes for Profiles New level of Coarseness 0.3 (default suggestion 0.25)
• Reason :: Profiles seem to be giving slightly lower error rates compared to signatures.
• Working on the write up.

Updates

• Working on two papers on shoe print matching algorithm
• In addition to corners, also working on features called SURF ( Speeded-up Robust Features).

Updates

SLR = dissimilarity + rarity

• Is there a generally applicable way of incorporating a measure of trace rarity into a SLR?
• Consider a bivariate score: (dissimilarity score, trace rarity)
• What happens in the case where data is univariate and normal?

Simple SLR/Bivariate SLR/LR comparison