page.title=Rotation Vector CV Crosscheck
@jd:body

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<div class="figure" style="width:214px">
  <img src="images/acircles_pattern_reduced.png" alt="Test pattern thumbnail" height="166" />
  <p class="img-caption">
    <strong>Figure 1.</strong> Thumbnail of test pattern. Download the
full-resolution image linked above.
  </p>
</div>
<p>This page provides the steps to properly test the compatibility of your <a
href="https://source.android.com/devices/sensors/sensor-types.html#rotation_vector">rotation
vector sensor</a> implementation. This test should be run when the device declares
the TYPE_ROTATION_VECTOR composite sensor feature.</p>

<ol>
  <li>Install OpenCV Manager on the Android device being tested. You may choose one
the following options:
    <ul>
    <li>Install from <a
href="https://play.google.com/store/apps/details?id=org.opencv.engine">Google
Play</a>; search for <em>OpenCV Manager</em> in Google Play if this link is
outdated.
    <li>Install from OpenCV SDK from <a
href="http://opencv.org/downloads.html">OpenCV.org</a>. Please choose
<strong>OpenCV for Android</strong> with version 3.0.0. You will find the APK
from the <code>apk</code> folder inside the downloaded archive. Please consult <a
href="http://developer.android.com/tools/help/adb.html#move">installing an
application</a> for the command to load APKs onto the Android device from
computer.
  </ul>
  <li>Print out the linked <a href="images/acircles_pattern.png">test pattern</a>,
disabling any scaling options when printing. The pattern should fit US
Letter paper in landscape or anything bigger.
<p class="note"><strong>Note:</strong> The inline picture above is low
resolution and just for illustration. Please do not directly print it as your
pattern.</p>
  <li>Place the pattern on a horizontal surface.
  <li>Start the <strong>Rotation Vector CV Crosscheck</strong> in the CTS Verifier
app. Follow the guide to turn on airplane mode, turn off auto rotate, and
adjust adaptive brightness and location if these changes have
not been made.<br />
  <img src="images/RVCVXCheck_start.png" alt="Test initiation" height="533" id="test-start" />
  <p class="img-caption">
    <strong>Figure 2.</strong> Initiating the test.
  </p>
  <li>When the video preview appears, place the phone three feet (or one meter) over
the pattern so the main camera is facing the pattern with yellow marker on the
screen and yellow marker on the pattern aligned at the same corner.<br />
<img src="images/RVCVXCheck_down.png" alt="Test pattern placement" height="207" id="test-pattern-placement" />
  <p class="img-caption">
    <strong>Figure 3.</strong> Placing the test pattern.
  </p>
  <li>While keeping the pattern entirely in the camera view, rotate the Android
device under test (DUT) around the pattern in three different directions, one
by one (1, 2 and then 3 illustrated in picture below) as prompted by the
rotation range indicator. Keep movement smooth and steady for the best result.<br />
  <img src="images/RVCVXCheck_flow.png" alt="Device movement" height="426" id="device-movement" />
  <p class="img-caption">
    <strong>Figure 4.</strong> Manipulating the device under test.
  </p>
  <li>After the capture, the camera preview will disappear and the analysis process
will start. Wait patiently for analysis to finish; it usually takes one to five
minutes depending on the phone performance. The phone will sound and vibrate at
analysis completion. A numerical result will be presented on screen if the
analysis is successful.<br />
  <img src="images/RVCVXCheck_next.png" alt="Test completion" height="533" id="test-complete"/>
  <p class="img-caption">
    <strong>Figure 5.</strong> Finishing the test.
  </p>
  <li>Click <strong>next</strong> to proceed to the pass/fail screen and review the result.<br />
  <img src="images/RVCVXCheck_pass.png" alt="Test success" height="533" id="test-success" />
  <p class="img-caption">
    <strong>Figure 6.</strong> Passing the test.
  </p>
<li>Follow these tips for best results:
  <ol>
    <li>Since this is a manual test with complexity, you may want to try it a few times
for the best results.
    <li>Accelerometer, gyroscope, and magnetometer should be calibrated before testing
for good results.
    <li>See this <a href="https://www.youtube.com/watch?v=MsDVmsH1PaI">video
tutorial</a> for additional details.
  </ol>
</ol>