![]() ![]() 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. MovAlyzeR has a provision to obtain the resolution, sampling rate and pen-pressure, returned by the tablet wintab driver. 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. However, you do have a map.This is a common topic for MovAlyzeR & ScriptAlyzeR. * You ride a bike or boat and want to know how much distance you covered in your last trip, but you do not have an odometer or GPS unit. * You are a webmaster with visitor statistics charts and you want to do statistical analyses. * You are a graduate student gathering historical data from charts for your thesis. * You are an engineer with some graphs in decades-old documents, but you really need the numbers represented in those graphs so you can do analyses that will determine if a space vehicle is safe to fly. The final result is digitized data that can be used by other tools such as Microsoft Excel and Gnumeric. The process starts with an image file containing a graph or map. The numbers can be read on the screen, and written or copied to a spreadsheet. The image file can come from a scanner, digital camera or screenshot. This open source, digitizing software converts an image file showing a graph or map, into numbers. ![]()
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