MinFilterEllipsoid implementation

src/MATLAB/MinFilterEllipsoid.m

+function imageOut = MinFilterEllipsoid(image1,radius,device,useMatlab)
+%	This will set each pixel/voxel to the min value of an ellipsoidal neighborhood with the radii given.
+    
+if (~exist('device','var') || isempty(device))
+    device = 1;
+end
+
+if (~exist('useMatlab','var') || isempty(useMatlab))
+    useMatlab = false;
+end
+
+if (~useMatlab)
+    [numCudaDevices, memoryStats] = CudaMex('DeviceCount');
+    if (numCudaDevices < 1)
+        useMatlab = true;
+    elseif (device > numCudaDevices)
+        device = numCudaDevices;
+    end
+    
+    % do something smart here if there is not enough memory...
+end
+
+if (useMatlab)
+    [x,y,z] = ndgrid(-radius:radius);
+    se = strel(sqrt(x.^2 + y.^2 + z.^2) <= radius);
+    imageOut = imerode(image1, se);
+else
+    radiusZ = 3; radiusY = radiusZ; radiusX = radiusY;
+    imageOut = CudaMex('MinFilterEllipsoid',image1,[radiusX,radiusY,radiusZ],device);
+end
+end
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