jpylyzer


By davetaz on 29 February 2012 - 1:34pm

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Adventures in Debian packaging

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About a year ago, work started on packaging SCAPE tools. Jpylyzer was the first SCAPE tool that was turned into a Debian package.

By johan on 23 April 2013 - 10:53am

Mixing Hadoop and Taverna

As part of our work on test-beds for the SCAPE project we have been investigating the various ways in which a large scale file format migration workflow could be implemented.  The underlying technologies chosen for the platform are Hadoop and Taverna.  One of the aims of the SCAPE project is to allow the automatic generation and execution of Taverna workflows, which will be executed via Hadoop.

The four methods for implementing a file format migration workflow that we tested were:

  1. Batch execution of a shell script (no parallelisation)
  2. A workflow written in/controlled from Java, run on Hadoop
  3. A workflow written in/controlled from Taverna, run on Hadoop
  4. A workflow written in Taverna, calling an XML defined unit of execution in Hadoop
By willp-bl on 14 February 2013 - 1:48pm

Automated assessment of JP2 against a technical profile

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I've already written a number of blog posts on format validation of JP2 files. Format validation is only a one aspect of a quality assessment workflow. Digitisation guidelines typically impose various constraints on the technical characteristics of preservation and access images. For example, they may state that a preservation master must be losslessly compressed, and that its progression order must be RPCL. A format profile is a set of such technical constraints.

By johan on 4 September 2012 - 11:04am

Update on jpylyzer

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In this blog post I will give a brief update of the latest jpylyzer developments. Jpylyzer is a validation and feature extraction tool for the JP2 (JPEG 2000 Part 1) still image format.

By johan on 23 April 2012 - 10:53am

Jpylyzer documentation

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This will be my shortest blog post ever. Following up on my previous blog post on a prototype JP2 validator and properties extractor (jpylyzer), there is now a comprehensive User Manual of the tool. Just follow the link below and get the PDF file that is listed under 'Download Packages':

By johan on 10 January 2012 - 5:07pm

A prototype JP2 validator and properties extractor

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A few months ago I wrote a blog post on a simple JP2 file structure checker. This led to some interesting online discussions on JP2 validation. Some people asked me about the feasibility of expanding the tool to a full-fledged JP2 validator. Despite some initial reservations, I eventually decided to dedicate a couple of weeks to writing a rough prototype.

By johan on 14 December 2011 - 12:30pm

A simple JP2 file structure checker

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Over the last few weeks I've been working on the design of a workflow that the KB is planning to use for the migration of a collection of (mostly old) TIFF images to JP2. One major risk of such a migration is that hardware failures during the migration process may result in corrupted images. For instance, one could imagine a brief network or power interruption that occurs while an image is being written to disk. In that case data may be missing from the written file.

By johan on 1 September 2011 - 8:47am