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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,… »
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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
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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.… »
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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… »
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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… »
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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
Estimated age (months) achieved by proportion Words produced 50% 75% 90% 95%