% *  This code was used in the following articles:
% *  [1] Learning 3-D Scene Structure from a Single Still Image, 
% *      Ashutosh Saxena, Min Sun, Andrew Y. Ng, 
% *      In ICCV workshop on 3D Representation for Recognition (3dRR-07), 2007.
% *      (best paper)
% *  [2] 3-D Reconstruction from Sparse Views using Monocular Vision, 
% *      Ashutosh Saxena, Min Sun, Andrew Y. Ng, 
% *      In ICCV workshop on Virtual Representations and Modeling 
% *      of Large-scale environments (VRML), 2007. 
% *  [3] 3-D Depth Reconstruction from a Single Still Image, 
% *      Ashutosh Saxena, Sung H. Chung, Andrew Y. Ng. 
% *      International Journal of Computer Vision (IJCV), Aug 2007. 
% *  [6] Learning Depth from Single Monocular Images, 
% *      Ashutosh Saxena, Sung H. Chung, Andrew Y. Ng. 
% *      In Neural Information Processing Systems (NIPS) 18, 2005.
% *
% *  These articles are available at:
% *  http://make3d.stanford.edu/publications
% * 
% *  We request that you cite the papers [1], [3] and [6] in any of
% *  your reports that uses this code. 
% *  Further, if you use the code in image3dstiching/ (multiple image version),
% *  then please cite [2].
% *  
% *  If you use the code in third_party/, then PLEASE CITE and follow the
% *  LICENSE OF THE CORRESPONDING THIRD PARTY CODE.
% *
% *  Finally, this code is for non-commercial use only.  For further 
% *  information and to obtain a copy of the license, see 
% *
% *  http://make3d.stanford.edu/publications/code
% *
% *  Also, the software distributed under the License is distributed on an 
% * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either 
% *  express or implied.   See the License for the specific language governing 
% *  permissions and limitations under the License.
% *
% */
function [SupExpand]=ExpandSup2Sky(Sup,maskSkyEroded);

% This function expand the Sup to the maskSkyEroded mask
% So that the patch in the empty set of maskSkyEroded can 
% have assigned to a Sup index

SupExpand = Sup;
maskSkydilate = Sup == 0;
% setup the assigned index
AssignSupSubscripM = Sup(~maskSkydilate);
[AssignSupSubscripM(:,2) AssignSupSubscripM(:,3)] = find(~maskSkydilate);

[emptyPatchsubscriptX  emptyPatchsubscriptY] = find(xor(maskSkydilate,maskSkyEroded));

for i = 1:size(emptyPatchsubscriptX,1)
    centerX = emptyPatchsubscriptX(i);
    centerY = emptyPatchsubscriptY(i);
    if ~any(AssignSupSubscripM == Sup(centerX,centerY))
       [V I] = min(norms([AssignSupSubscripM(:,2)' - centerX ; AssignSupSubscripM(:,3)' - centerY]));
       TargetSupIndex = AssignSupSubscripM(I,1);
       SupExpand(centerX,centerY) = TargetSupIndex;     
    end
end

% CHECK
any(any(xor(SupExpand == 0, maskSkyEroded)));