MVTA Multimedia Video Task Analysis® automates time and motion studies and ergonomic analysis of visually discerned activities using a novel graphical user interface. MVTA was developed by Dr. Robert G. Radwin and Dr. Thomas Yen at the University of Wisconsin-Madison in cooperation with industry and government consortium members.
The software enables users to identify events interactively with the use of break points in the video record (identifying the start and end of an event). The video can be analyzed at any speed an in any sequence (real time, slow/fast motion or frame-by-frame in forward/reverse direction). MVTA produces time study reports and computes frequency of occurrence of each event as well as postural analysis.
The system can be used by industrial engineers, ergonomists, psychologists and other professionals for a variety of applications including:
MVTA uses custom multimedia software to facilitate interactive study of videotaped activities. Any event can be reviewed easily as long as desired by stop action or replaying in a continuous loop.
Various events and types of analysis can be easily viewed in the same time period. For example, the Main Motion Analysis Window below shows various joint positions and force exertion corresponding to various job events. MVTA has many features for quick and easy event break point assignment and editing. The video location is easily positioned with the video file control of the MVTA program.
As analysts view the video, they:
The software updates the timeline window with the new break points as new events are entered.
The event elements are initially determined by the analyst and entered into the event list window. As the analyst watches the video, the digit key (corresponding to an event) is pressed by the analyst marking the beginning of the selected event. As the events are entered, the timeline window is updated with the new break points.
Activities may be described using a hierarchical framework as shown below method for systematically documenting an activity using various levels of detail. The level of detail needed depends on the specific study. In the example shown, the top level of the hierarchy is the job. Jobs delineate work performed.
A very powerful feature of the MVTA system is record interaction. MVTA allows two independently observed activities to be combined to produce an interaction. For example; one may be interested in determining the object load levels during a five-task element job or which task element has the highest average load and duration. If the job contains 3 different objects or loads, the analyst would be required to keep track of 15 (3 loads x 5 task elements) different load/task element combinations. This would normally be an extremely tedious and time-consuming process. This is simplified by performing 2 sets of observations, one for the task elements and one for the object loads, and then doing an interaction between the two.
Other activities or factors where interactions may be valuable are force/load and posture, and posture and task elements. MVTA calculates postural angle and distances on a selected video image.
MVTA provides the user to easily create and manage events in the analysis, The analyst can go to breakpoints, change step intervals, move timeline cursor, change N-frame step intervals, etc.
There are 4 types of reports available in the MVTA system:
The report output characteristics can be customized prior to each analysis. The time study report provides information on the duration of the event elements. The frequency report provides information of the interval of occurrence or repetition rate of the event elements. Summary statistics are provided in the time study and frequency reports. The raw time report provides information on the times at which the event elements occur.
MVTA includes a variety of easy to use software features to control and analyze the video. MPEG (MPG) and AVI digital files are supported.
These features allow the analyst to:
The following summarizes the key features and changes from version 3.0:
Certain issues have also been corrected and include:
The following summarizes the key features and changes from version 2.9:
NOTE: Software trials are provided for evaluation only prior to possible purchase by those involved in the evaluation and decision process. We also provide them to students when the university has purchased the software and the trial is coordinated thru academic staff.