camera3: Update whiteLevel/greenSplit docs.
Bug: 13191430
Change-Id: I61cab65da546bdf1a748f46c28b6fce218b27bc4
diff --git a/core/java/android/hardware/camera2/CaptureResult.java b/core/java/android/hardware/camera2/CaptureResult.java
index 7eb63d6..f528bdd 100644
--- a/core/java/android/hardware/camera2/CaptureResult.java
+++ b/core/java/android/hardware/camera2/CaptureResult.java
@@ -1720,8 +1720,12 @@
* filter array.</p>
* <p>The green split is calculated as follows:</p>
* <ol>
- * <li>A representative 5x5 pixel window W within the active
- * sensor array is chosen.</li>
+ * <li>A 5x5 pixel (or larger) window W within the active sensor array is
+ * chosen. The term 'pixel' here is taken to mean a group of 4 Bayer
+ * mosaic channels (R, Gr, Gb, B). The location and size of the window
+ * chosen is implementation defined, and should be chosen to provide a
+ * green split estimate that is both representative of the entire image
+ * for this camera sensor, and can be calculated quickly.</li>
* <li>The arithmetic mean of the green channels from the red
* rows (mean_Gr) within W is computed.</li>
* <li>The arithmetic mean of the green channels from the blue