  Ergonomic risk assessment is now, due to an increased awareness, carried out
more often than in the past. The conventional risk assessment evaluation, based
on expert-assisted observation of the workplaces and manually filling in score
tables, is still predominant. Data analysis is usually done with a focus on
critical moments, although without the support of contextual information and
changes over time. In this paper we introduce ErgoExplorer, a system for the
interactive visual analysis of risk assessment data. In contrast to the current
practice, we focus on data that span across multiple actions and multiple
workers while keeping all contextual information. Data is automatically
extracted from video streams. Based on carefully investigated analysis tasks,
we introduce new views and their corresponding interactions. These views also
incorporate domain-specific score tables to guarantee an easy adoption by
domain experts. All views are integrated into ErgoExplorer, which relies on
coordinated multiple views to facilitate analysis through interaction.
ErgoExplorer makes it possible for the first time to examine complex
relationships between risk assessments of individual body parts over long
sessions that span multiple operations. The newly introduced approach supports
analysis and exploration at several levels of detail, ranging from a general
overview, down to inspecting individual frames in the video stream, if
necessary. We illustrate the usefulness of the newly proposed approach applying
it to several datasets.
