Add caption to decomp fig

diff --git a/fig/img_decomp.tex b/fig/img_decomp.tex
index 27a56ec83a3b4c74ec93d6673dd250ea0a73fc96..d80ae4e5c681b9c7d14b83161f732ca44849d854 100644 (file)
--- a/fig/img_decomp.tex
+++ b/fig/img_decomp.tex
@@ -133,4 +133,7 @@
     \caption{The thresholded images, which are in
     $\{0,1\}^{\abs{\Omega}}$.}
 \end{subfigure} 
-
+\caption{A sample gray-scale image, and its decomposition into
+    thresholded images. Note that while the image has values from the
+    set $\{0, \ldots, 3\}$, the thresholded images are binary.
+}