transform Points Forward with cell
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Hi, I need a help to apply a transformation to a cell array that contains the bboxPolygon values..here's the code:
%% Loop through video while ~isDone(videoReader) % get the next frame videoFrame = step(videoReader);
% Use pointTracker to track feature points
for i = 1:N
[punti{i},validity] = step(tracker{i},videoFrame);
% Keep only the valid points and discard the rest
visiblePoints{i} = punti{i}(validity,:);
oldInliers{i} = oldPoints{i}(validity,:);
[xform, oldInliers{i}, visiblePoints{i}] = estimateGeometricTransform(...
oldInliers{i}, visiblePoints{i}, 'similarity', 'MaxDistance', 4);
end
% Apply the transformation to the bounding box
for i = 1:P
[bbcell{i}(1:2:end),bbcell{i}(2:2:end)]=transformPointsForward(xform, bbcell{i}(1:2:end)...
,bbcell{i}(2:2:end));
end
for i = 1:N
videoFrame = insertShape(videoFrame, 'Polygon',bbcell{i});
videoFrame = insertMarker(videoFrame, visiblePoints{i}, '+', ...
'Color', 'white');
% % Save the new state of the point tracker
% oldPoints{i} = visiblePoints{i};
% setPoints(tracker{i}, oldPoints{i});
% Display output
step(videoPlayer, videoFrame);
end
end
______________________________________
but when I start this code the shapes run away from the video clip or move themselves in wrong direction! Thanks a lot for helping me!
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Respuestas (4)
Dima Lisin
el 30 de Jun. de 2014
Editada: Dima Lisin
el 30 de Jun. de 2014
I would try capturing the output of transformPointsForward() into a temporary variable, and then assigning that to bbcell{i}.
On a different note, it looks like you are trying to track multiple objects. A better way to do that is to use a single vision.PointTracker, rather than multiple ones. The reason is that each of your point tracker objects will pre-process the frame exactly the same way. Using one point tracker will only pre-prosses the frame once, eliminating this wasted computation. However, that means you would need to concatenate all your points into a single Mx2 matrix, and you would need to maintain an Mx1 array of indices to keep track of which point belongs to which object.
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antonio
el 1 de Jul. de 2014
1 comentario
Dima Lisin
el 1 de Jul. de 2014
Can you try this:
[x, y] = transformPointsForward(xform, bbcell{i}(1:2:end),...
bbcell{i}(2:2:end));
bbcell{i}(1:2:end) = x;
bbcell{i}(2:2:end) = y;
As to your second question, you seem to have a cell array of point trackers, one for each object, correct? Instead, you should only use one point tracker for tracking all the points from all the objects.
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