PmotionEstES.m
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上传日期:2022-08-09
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文件大小:2k
- % Computes motion vectors using exhaustive search method
- %
- % Input
- % imgP : The image for which we want to find motion vectors
- % imgI : The reference image
- % mbSize : Size of the macroblock
- % p : Search parameter (read literature to find what this means)
- %
- % Ouput
- % motionVect : the motion vectors for each integral macroblock in imgP
- % EScomputations: The average number of points searched for a macroblock
- %
- % Written by Aroh Barjatya
- function motionVect = motionEstES(imgP, imgI, mbSize, p)
- [row col] = size(imgI);
- vectors = zeros(2,row*col/mbSize^2);
- costs = ones(2*p + 1, 2*p +1) * 65537;
- %computations = 0;
- % we start off from the top left of the image
- % we will walk in steps of mbSize
- % for every marcoblock that we look at we will look for
- % a close match p pixels on the left, right, top and bottom of it
- mbCount = 1;
- for i = 1 : mbSize : row-mbSize+1
- for j = 1 : mbSize : col-mbSize+1
-
- % the exhaustive search starts here
- % we will evaluate cost for (2p + 1) blocks vertically
- % and (2p + 1) blocks horizontaly
- % m is row(vertical) index
- % n is col(horizontal) index
- % this means we are scanning in raster order
-
- for m = -p : p
- for n = -p : p
- refBlkVer = i + m; % row/Vert co-ordinate for ref block
- refBlkHor = j + n; % col/Horizontal co-ordinate
- if ( refBlkVer < 1 | refBlkVer+mbSize-1 > row ...
- | refBlkHor < 1 | refBlkHor+mbSize-1 > col)
- continue;
- end
- costs(m+p+1,n+p+1) = costFuncMAD(imgP(i:i+mbSize-1,j:j+mbSize-1), ...
- imgI(refBlkVer:refBlkVer+mbSize-1, refBlkHor:refBlkHor+mbSize-1), mbSize);
- % computations = computations + 1;
-
- end
- end
- % costs
- % Now we find the vector where the cost is minimum
- % and store it ... this is what will be passed back.
-
- [dx, dy, min] = minCost(costs); % finds which macroblock in imgI gave us min Cost
- vectors(1,mbCount) = dy-p-1; % row co-ordinate for the vector
- vectors(2,mbCount) = dx-p-1; % col co-ordinate for the vector
- mbCount = mbCount + 1;
- costs = ones(2*p + 1, 2*p +1) * 65537;
- end
- end
- motionVect = vectors;
- %EScomputations = computations/(mbCount - 1);
-