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minKey2.m
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minKey2.m
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function [minidx,parentidx, minDir] = minKey2(zmstSet, zmstLast, zTaken,...
WXR, WXL, WYU, WYD, GXR, GXL, GYU, GYD, dimX, dimY)
global useLocWeight;
global zalpha;
global gmstSet;
gmstSet = zmstSet;
% find the smallest weight of current location idx
minVal = Inf;
minidx = [0,0];
minDir = 0; %minvalue direction from current node
% with location weight
% useLocWeight = true;
if useLocWeight
alpha = zalpha; % blend term for location and other weights
else
alpha = 0;
end
% beta = 0.9;
beta = 1;
global factor;
factor = 1;%0.95;
for i = zmstLast:-1:1
iid = zmstSet(i,:);
idX = iid(2); idY = iid(1);
% check 4 neighbors
if idY-1 < 1% up
else
if zTaken(idY-1,idX) == false &&...
(1-alpha)*factor* (beta * WYU(idY-1,idX) + (1-beta)*GYU(idY-1,idX)) + alpha*locTerm(zmstLast+1, [idY-1,idX], [dimY, dimX]) < minVal
% WYU(idY-1,idX) < minVal
minVal = (1-alpha)* (beta * WYU(idY-1,idX) + (1-beta)*GYU(idY-1,idX)) + alpha*locTerm(zmstLast+1, [idY-1,idX], [dimY, dimX]);%WYU(idY-1,idX);
minidx = [idY-1,idX];
parentidx = [idY,idX];
minDir = 1;
end
end
if idX+1 > dimX % right
else
if zTaken(idY,idX+1) == false &&...
(1-alpha)*factor* (beta * WXR(idY,idX)+(1-beta)*GXR(idY,idX)) + alpha * locTerm(zmstLast+1, [idY,idX], [dimY, dimX]) < minVal
% WXR(idY,idX) < minVal
minVal = (1-alpha)* (beta * WXR(idY,idX)+(1-beta)*GXR(idY,idX)) + alpha * locTerm(zmstLast+1, [idY,idX], [dimY, dimX]);%WXR(idY,idX);
minidx = [idY,idX+1];
parentidx = [idY,idX];
minDir = 3;
end
end
if idY+1 > dimY % down
else
if zTaken(idY+1,idX) == false &&...
(1-alpha)*factor* (beta*WYD(idY,idX)+(1-beta)*GYD(idY,idX)) + alpha*locTerm(zmstLast+1, [idY,idX], [dimY, dimX]) < minVal
% WYD(idY,idX) < minVal
minVal = (1-alpha)* (beta*WYD(idY,idX)+(1-beta)*GYD(idY,idX)) + alpha*locTerm(zmstLast+1, [idY,idX], [dimY, dimX]);%WYD(idY,idX);
minidx = [idY+1,idX];
parentidx = [idY,idX];
minDir = 2;
end
end
if idX-1<1 %left
else
if zTaken(idY,idX-1) == false &&...
(1-alpha)*factor*(beta*WXL(idY,idX-1)+(1-beta)*GXL(idY,idX-1)) + alpha*locTerm(zmstLast+1, [idY,idX-1], [dimY, dimX]) < minVal
% && WXL(idY,idX-1) < minVal
minVal = (1-alpha)*(beta*WXL(idY,idX-1)+(1-beta)*GXL(idY,idX-1)) + alpha*locTerm(zmstLast+1, [idY,idX-1], [dimY, dimX]);
minidx = [idY,idX-1];
parentidx = [idY,idX];
minDir = 4;
end
end
end
end
% the position weight term
function w = locTerm(visitId, pos, dim)
global factor;
global gmstSet;
% w = abs(visitId - ((dim(1) - pos(1)+1)*dim(2)+pos(2)))/(dim(1)*dim(2))*256;
% neighborhood = 4 * 4;
% maxDist = [0 0];
% minId = max(visitId - neighborhood,1);
% idO = [1 1];
% for i = minId:visitId
% iid = gmstSet(i,:);
% if i == minId
% idO = iid;
% end
% maxDist(1) = max(iid(1) - idO(1), maxDist(1));
% maxDist(2) = max(iid(2) - idO(2), maxDist(2));
% end
% w = max(norm(maxDist), norm(pos - idO))/ neighborhood;
% return;
% get center of the volume
posF = pos ./ dim;
bkSize = 1/4; % 1/8 of the size
portY = floor(posF(1) / bkSize);
portX = floor(posF(2) / bkSize);
CtrThis = [dim(1)*(portY+0.5)*bkSize, dim(2)*(portX+0.5)*bkSize];
CtrThisId = CtrThis(1)*dim(2) + CtrThis(2);
% get the closest block center ID
numBkY = 1.0/bkSize;
numBkX = 1.0/bkSize;
% minDist = realmax;
% for yy = 0:numBkY-1
% for xx = 0:numBkX-1
% bkCtr = [dim(1)*(yy+0.5)*bkSize, dim(2)*(xx+0.5)*bkSize];
% bkCtrId = bkCtr(1)*dim(1)+bkCtr(2);
% if (abs(visitId - bkCtrId) < minDist)
% minDist = abs(visitId - bkCtrId);
% minDistBlkId = yy*numBkX + xx;
% end
% end
% end
%
% normT = 1/(dim(1)*dim(2));
% distId2PosId = abs(visitId - CtrThisId);
% distId2PosId = minDist;
distPos2Ctr = norm(pos - CtrThis); %(pos(1)-Ctr(1))*dim(2)+pos(2)-Ctr(2);
% normC = 1/norm(dim(1)*dim(2));
normC = 1/sqrt(bkSize*dim(1)*bkSize*dim(2));
normT = normC;
% w = abs(distId2PosId * normT - distPos2Ctr*normC)/factor;
% w = abs(distId2PosId * normT - distPos2Ctr*normC)/factor;
w = abs(distPos2Ctr*normC)/factor;
return;
%% old codes
% normT = 1/(dim(1)*dim(2));
% Ctr = [dim(1)/2,dim(2)/2];
% CtrId = Ctr(1)*dim(2)+Ctr(2);
% % get distance to center of the volume
% distId2Ctr = abs(visitId - CtrId);
% posId = (pos(1)*dim(2)+pos(2));
% distId2PosId = abs(visitId - CtrId);
% distPos2Ctr = norm(pos - Ctr); %(pos(1)-Ctr(1))*dim(2)+pos(2)-Ctr(2);
% normC = 1/norm(Ctr);
% % w = abs(distId2PosId * normT - distPos2Ctr*normC)/factor;
% w = abs(distId2PosId * normT - distPos2Ctr*normC)/factor;
% % w = abs(distId2Ctr* normT - distPos2Ctr*normC)/factor;
% % w = abs(distPos2Ctr*normC);
% % w = abs(distId2Ctr* normT);
% % w = w * 255;
end