Description of PEAT Features and Controls
The numbers in this description refer to labels on the PEAT screen shown above.
- Title bar. Blue band across top of screen. Name of program is UW-Trace Center Photosensitive Epilepsy Tool (Beta Version 0.2). The directory on your computer and file name selected to analyze are also shown.
- Menu bar. The menu bar features six pull-down menus. They include: File, View, Controls, Results, and Help. Menu options can be accessed with standard Windows key commands and mouse operation, such as Alt + "First Letter of Drop-down Menu" or by pointing and clicking. Most menu bar option have keystroke equivalents or can be alternatively performed with on-screen controls. A brief description of each menu option follows.
- File: Open video clips or reports here. Reports are columnar data representing analysis, including some thumbnail images. Print reports or change printer set-up of reports.
- View: Zoom control, Tooltips and Diagnostics toggles.
- Controls: Video controls, Analyze video clip control.
- Results: Move between failure/warning(s) or turn warnings on or off.
- Help: Web sites, user documentation.
- Trace logo
- Analysis window. This is a visual display of failures in the form of a dynamic graph that fills up most of the tool’s screen. This graph shows the material being analyzed, starting at the left and ending at the right. The image moves as the video clip progresses. A green vertical line marks the particular frame that is currently being viewed. At the bottom of the graph, the time intervals are also noted. Whenever a luminous flash, red flash, or extended failure line crosses into the area in the chart marked "fail," the material being tested has failed. In the screen shot shown above, the luminance flash failure occurs when the flash count indicated by the solid black line crosses the pass-fail line. Similarly the red flash fails when the solid red line representing the red flash count crosses the pass-fail line. The height of the luminous flash (dotted black) and red flash failures (dotted red) is determined by the brightness of the flash and the area of the screen that is flashing. In the example shown, the failures can be seen to be extreme. The flash count lines are considered "diagnostics" and are indicated as "diag" in the legend.
Legend. The legend defines three lines for different types of flash failure as are represented in the Analysis window. The legend also indicates two diagnostic lines which keep track of the number of flashes. These counts are part of the failure calculation. The lines are defined as follows:
- A dotted black line represents a luminous flash failure
- A dotted red line represents a red flash failure
- A blue variable dash line represents an extended failure (that is, when luminous flash or red flash does not quite fail but sits at or near failure for an extended period of time)
- A solid black line counts luminous flashes (diagnostic)
- A solid red line counts red flashes (diagnostic)
To the left of each failure line in the legend is a circle that shows green (pass) or red (fail) during analysis.
- Video window. To the left of the Analysis window is a viewing window that shows the actual video content being analyzed. This image can be made larger and smaller. A small image is safe for individuals with most seizure disorders to view. At a normal viewing distance of 18 inches, the video window can be zoomed down to approximately one inch square to minimize risk of seizure.
- Video controls. Below the viewing window on the left are the controls. These allow the material to be played, stopped, viewed in fast forward or reverse.Controls also provide the ability to step through the material frame by frame, both forward and reverse. This makes it easy to see exactly what is going on, and is also the safest possible way to view or explore the material for individuals with photosensitive seizure disorders since there is no repeat flashing just changes in picture from frame to frame. The frames can even be viewed in large size when stepped slowly. A small display window indicates the current time location in the recorded material.
- Video position slider. Above the Video controls and running from the left to the right of the tool is a light green bar with dark red areas on it. This bar will be greyed out before a video clip is analyzed. The line represents the entire recorded material. The light green areas are safe and the dark red areas show where failures occur. A slider on the bar can be moved using a mouse or the keyboard to move you back and forth through the material or to move to any point in the material.
- Open file button. Clicking on this button will open a Windows dialog box so that you can browse through your directories to select the file that you wish to analyze.
- Analyze button. This button will be greyed out until you have selected a file to analyze. Once the file has been selected, you can click this button to begin the analysis. You will see the Analysis window scrolling, as well as the Video position slider moving along to indicate the progress of the analysis.
- Video file information. In the middle at the bottom of the tool is a display window that provides all of the information about the clip currently being viewed. This includes the name of the file, its date of analysis, time of analysis, running time of the recorded clip, the size of the file, the type of video compression being used, and the name of the codec that should be used for decompression.
- Failure/Warning controls. On the bottom right of the tool are controls that allow the user to skip forward and backwards from one failure/warning point to the next. A small display window indicates both the total number of failures/warnings and the number of the failure/warning being displayed. A check box allows you to show only failures or to include warnings with the failures on the green slider bar.
- NIDRR logo
- Zoom slider. A zoom control just below the Analysis window lets you look at the graph for the whole recording or zoom in on any portion of the graph.
- Pass/Fail line. Light brown horizontal bars and lines at the bottom of the Analysis window (from the bottom up) indicate pass, caution (pass), caution (fail), and fail. Warnings are defined as events that fall within the caution (pass) bar, but do not exceed the pass/fail line.
PEAT Keyboard Shortcuts
| File Options | View Options | ||
|---|---|---|---|
| Open video clip | Ctrl+O | Zoom in | Z |
| Open report | Alt+O | Zoom out | Alt+Z |
| Save report | Ctrl+S | Zoom all | Ctrl+A |
| Print report | Ctrl+P | Tooltips | T (toggles) |
| Preview report | Alt+P | Diagnostics | Ctrl+D (toggles) |
| Setup report | Ctrl+R | ||
| Controls Options | Results Options | ||
|---|---|---|---|
| Play | P | Analyze | A |
| Stop | S | Next defect | D |
| Rewind | R | Previous defect | Alt+D |
| Step forward | F | Show warnings | Ctrl+W (toggles) |
| Step back | B | ||
| Analyze | A | ||
Printable PEAT Keyboard Shortcuts (pdf)
Funding for this work has been provided by the National Institute on Disability and Rehabilitation Research (NIDRR), U.S. Department of Education, under grant H133E980008.