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Thread: Digitizer settings and tests

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    Nov 2003
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    Digitizer settings and tests

    www.NeuroScriptSoftware.com forums

    To minimize trouble shooting the digitizer tablet settings and display mapping, use the following strategy:

    1. Check Wacom driver version:
    o Start >Control Panel >Wacom Tablet preoperties >About
    o Verify you have a recent version, e.g., 4.96-7 (27 June 06).
    WARNING: Updating the Wacom driver may alter samplign rate or resolution.

    If your Wacom driver is older, do a clean re-install
    o Start >Control Panel >Add/Remove programs >Locate Tablet (click Support Information that it is Wacom's tablet dirver) >Remove
    o Go to www.wacom.com >Support >Select your tablet and your system >Download and run install.

    2. SETTINGS of Digitizer in MovAlyzeR

    OPTION 1: Mapping of the (left bottom PART of the) digitizer on the ENTIRE display

    User Settings
    o Start MovAlyzeR
    o Settings >Select input device >Tablet
    o Acquire sizes of digitizer
    o Manually set sizes (in cm) of the display
    o Select Entire Desktop (feedback will not be real-size)

    Experiment Settings
    o Running Experiment >Trials
    o Maximize recording window
    o Rightclick PH2 experiment >Recording >Input Device
    o Acquire device settings

    Examples:
    o The Wacom Intuos3 12x9 digitizer's size is 30.5 cm x 22.8 cm (using 2.54 cm/inch, but is actually 0.0005 cm less).
    o Wide screen display of 30.5 cm x 18.3 cm can be used by tweaking the digitizer to be 30.5 cm x 18.3 cm (thus the top 4.5 cm is not used).

    CONS:
    o If the digitizer has a different aspect ratio than the display, manually reduce the digitizer size.
    o The left , top, bottom borders of the digitizer are not used because the recording window is embedded in windows.

    OPTION 2: Mapping of the (left bottom PART of the) digitizer in real size.
    NOTE: If your display is to small, Movalyzer will show too big ==>Reduce digitizer part

    o Settings >Select input device >Select Map Tablet to Recording Window
    o Rightclick your experiment >Recording >Input Device >Acquire device settings
    o To map the bottom left part of the digitizer INSIDE the recording window so the subject cannot move the pen towards the controls on the left and bottom:
    o To set REAL SIZE we can specify that the digitizer is 2.5 cm narrower and 6.5 cm less high than the previous display sizes. So what we win at the left and bottom margins, we loose at the right and top margins.

    EXAMPLE: When you use:
    Display: 29.6 cm x 18.1 cm
    Digitizer: 6 x 8 = 20.3 x 15.2 cm ===>When mapping on ENTIRE DISPLAY (not real size): Reduce digitizer proportionally to 20.3 cm x 12.9 cm (Overruling Acquire).
    Desired REAL=SIZE are 8 1/4 x 3 = 20.9 cm x 7.6 cm ====>When mapping to RECORDING WINDOW (real size): Change digitizer to 20.9 cm x 7.6 cm (Overruling Acquire).

    OPTION 3: Mapping of ENTIRE digitizer at REDUCED SIZE on display.

    o Settings >Select input device >Select Map Tablet to Recording Window
    o Rightclick your experiment >Recording >Input Device >Acquire device settings
    o To map the entire display within the recording window we have nto other option than to reduce the feedback because the displays are not much larger than the digitizer
    o To map the ENTIRE DIGITIZER AT REDUCED REAL SIZE and have the entire digitizer mapped on the recording window inside the display. In that case, set the digitizer as is but ADD the extra sizes to the display size.

    OPTION 4: Mapping of ENTIRE Digitizer in REAL SIZE on the display

    o For the Wacom Intuos3 12x9 digitizer you will need a 20" display (which is >2.5 cm wider and >6.5 cm higher than the digitizer. For the Wacom Intuos 8x6 digitizer you will need a 14" display)
    o Settings >Select input device >Select Map Tablet to Recording Window
    o Rightclick your experiment >Recording >Input Device >Acquire device settings

    3. TESTS each time anything has changed.

    3a. Range of data
    o Start running a subject in the experiment
    o Move pen so that the cursor on the screen goes from bottom left to top right.
    o Verify the cursor moves across the relevant part of the digitizer.

    3b. Scaling of data and time
    o Record the following trial
    o Write a circle of 2 cm diameter (approximately) with a normal pen on paper.
    o Make 5 overlapping circles with the pen at a rate of about 2 s per circle.
    o Double-click on the trial just recorded.
    o Verify the processed data chart in the y as a function of time graph that the amplitude is 2 cm and the duration of 5 circles is about 10 s. Repeat the same for the x as a funtion of time graph.

    3c Accuracy of data and time
    o Record the following trial
    o Use a plastic ruler positioned at 45 degrees across the digitizer
    o Lower pen, against the ruler, make a very fluent, middle fast movement without wobbling the pen and lift.
    o Accept the trial
    o Stop the experiment.
    o Rightclick on the very trial >Test linearity >View all charts.
    o Verify the Missing Sample Estimator graph as only points around 0 or 1 and no .5 or 2.
    o Verify in the Results window (move the splitter) that the RMS sample error is around 0.005 cm.

    See: http://www.neuroscript.net/help/testingdigitizer.html on the general procedure and the attached .doc file
    Attached Files
    Last edited by Hans-Leo; 2006-12-10 at 23:47.

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