Foreground segmentation with JBIG2 for improved PDF compression: pdf-segmented

Motivation

JBIG2 is an efficient image compression format for bi-level (bi-tonal) images, which is supported by the PDF file format and common PDF viewers. To date, tooling for producing documents using JBIG2 (particularly open source tooling) has been limited; I have previously presented file-jbig2pdf,… »

What is a registrar? – A ‘who's who’ of public hospital doctors

What, exactly, is a medical registrar? As a medical student, I was told ‘a registrar is a doctor in a training program’. A survey of Google search results shows this view is widespread:

A medical registrar is a doctor who undergoes advanced training in a

Investigating a proprietary Android 2FA system

This article concerns an Android app used as part of a proprietary two-factor authentication (2FA) system. Investigation of the app and 2FA protocol reveals some interesting design decisions.

Overview

The 2FA system is similar to well-known offerings such as Duo Security and Okta Verify.… »

Investigating a historical Android anti-root protection system

This article concerns a specialised Android app used as part of a proprietary authentication protocol, developed in the late 2010s. Given the intended use case, the app features a number of aggressive security measures – the app uses FLAG_SECURE and does not run when developer… »

GIMP 3.0 plug-in for exporting JBIG2-encoded PDF files

JBIG2 is an efficient image compression format for bi-level (bi-tonal) images, which is supported by the PDF file format and common PDF viewers, but which lacks widely available tooling for its generation. GIMP is an open-source image editing suite, which has the capacity to output… »

Australian English communication growth charts

Below are presented expressive vocabulary ‘growth charts’ and limit ages, for an Australian English cohort, based on the norming samples for the long-form Australian English Communicative Development Inventory (OZI),^1,2 and its short form (OZI-SF).^3,4