SoftThresholding: fix for bad input threshold

Signed-off-by: Nicola Vigano <nicola.vigano@esrf.fr>

git-svn-id: https://svn.code.sf.net/p/dct/code/trunk@625 4c865b51-4357-4376-afb4-474e03ccb993

zUtil_Imaging/gtSoftThreshold.m

@@ -2,6 +2,8 @@ function img = gtSoftThreshold(img, thr)
 % GTSOFTTHRESHOLD Applies soft thresholding to the image
 %   img = gtSoftThreshold(img, thr)
 
+    thr = min(thr(:));
+
     tempImg = abs(img) - thr;
     tempImg = (tempImg + abs(tempImg)) / 2;
     img = sign(img) .* tempImg;