Also in Pointer options> Switch OFF the option 'Enhance Pointer Precision'. Under Pointer Options > Select Pointer Speed. The mouse speed can be manipulated via My Computer >Control Panel >Mouse. O To see how the tablet driver or mouse settings can affect the sampling rate, see this section. You need to go to an experiment under the current user > right click > experiment settings > input device settings > click reset defaults (need to do this only if you have not already done so, while determining the resolution) > the corresponding values returned by the driver are displayed. In case of the mouse, the pen pressure is always 1. MovAlyzeR has a provision to obtain the resolution, sampling rate and pen-pressure, returned by the tablet wintab driver. Charts can be customized and exported, for more details, refer chart properties help page. O Charts of recorded data: X-Y, X-Z, Y-Z, Sample number vs. The pen-ups are marked with a grey color. Irregular spacing implies undesirable, non-constant sampling. The distances between the samples (representing time intervals of 1/Sampling Rate) should vary fluently and should not show any gaps. O The small squares mark the individual samples. O After completing the recording, the data recorded are shown. ~ Lifting the pen too far away from the digitizer may suspend recording. ~ When the pen exceeds the digitizer window, recording discontinues. If you have not yet recorded through an experiment, in the current user, the recording window will be as default: Expanded and mapped to the entire tablet. ~ The recording window properties are derived from the settings of the previous experiment run for that user. Use the value that occurs most frequently during the movement, as the sampling frequency. O During recording, read the Timer Call and the Position Update frequencies (i.e., frequency that the PC calls for and receives points, respectively). O Make a free-hand recording (say loops) on the tablet by looking at the recording window on the screen. O In the resulting dialog window, specify the resolution obtained from previous testing, and use the defaults for sampling rate and pen-pressure. O The test procedure can be started by Settings > Test/Record Input Device. You need to go to an experiment under the current user > right click > experiment settings > input device settings > click reset defaults > the corresponding values returned by the driver are displayed.Īctual resolution (obtained from the tablet driver) In case of mouse, the default settings from Windows are displayed. O Take the average of the two results or perform more iterations, to arrive at a device resolution.Īlternatively, if you want to keep the recording stored, you can create an experiment with two conditions, one for horizontal line and one for vertical line and record the movements under a subject. O Repeat the test by drawing a line in the vertical direction and measuring the Y-coordinate distance. The user root folder is the folder where you store the data for your current experiment (file > users.> click on user ID > The difference in coordinates can also be found by opening the raw data file (user root folder > folder named with experiment ID > test.hwr), and considering the first and last Y coordinates (2nd column). O Derive the distance between the two y coordinates precisely = |x1-x2| points.įor example: For a graphire3, the difference in X coordinates in the x-y raw data plot, yielded 4000 points, when a line of 5cm recording was made on the tablet. O Go to the raw data chart after recording by trial > right click > chart raw data O Click Go to start the recording > Place the pen at point A and move till point B. In case of the mouse, place a ruler on the mouse pad instead. O Place a ruler on the tablet and consider two points A and B horizontally, at a distance D1 cm. O In the Dialog window, use the default settings: O Settings > test input device > test device free hand. Resolution can be verified from the following tests: This is however the hardware resolution and the driver in some tablets may not be able to provide data at such a resolution. Resolution can be obtained from Manufacturer's specifications. Verify that the dimensions and mapping are correctly set. These programs will be referred to as MovAlyzeR on this page.īefore starting the tests, choose the device to be tested (settable per user), main Tool bar > Settings > Select input device. This is a common topic for MovAlyzeR & ScriptAlyzeR.
0 Comments
Leave a Reply. |