Wednesday, March 12, 2008
End of Downswing
We haven't been considering the end of the downswing, so are results for that portion are expectedly erratic. But for a few cases, it does an okay job.
Miscellaneous Video Tools
To create a video from images:
mencoder "mf://*.png" -vf scale=360:240 -mf fps=29 -o out.avi -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=800
To embed a movie directly in a webpage:
http://cit.ucsf.edu/embedmedia/step1.php
mencoder "mf://*.png" -vf scale=360:240 -mf fps=29 -o out.avi -ovc lavc -lavcopts vcodec=msmpeg4v2:vbitrate=800
To embed a movie directly in a webpage:
http://cit.ucsf.edu/embedmedia/step1.php
Monday, March 10, 2008
Extreme (part 2)
Over the weekend we re-wrote the early parts of our pipeline (up until Canny, right before Hough) to streamline them and make them a little faster. In the process, we introduced a bug where the masks that were being applied to each frame were offset by one. This led to a degradation in the quality of edge detection and consequently the Hough lines. Now that we've fixed that bug, the Hough lines are pretty much back to where they were before. And as a result, our extreme hypothesis checker shows better results.
Notice that for this video, the results are what we would like to always have: that the topmost point is at the highest point in the swing and that the bottommost point is the shadow of the club head at the bottom of the swing.
Notice that for this video, the results are what we would like to always have: that the topmost point is at the highest point in the swing and that the bottommost point is the shadow of the club head at the bottom of the swing.
Sunday, March 9, 2008
Extreme Hypothesis Checking
In deciding whether or not to guide RANSAC towards fitting extreme points in all directions, we have examined the extreme points obtained on some of our sample videos. Out of the five videos we tried this on, in most cases the four extreme points corresponded to the clubhead. In one case, the topmost point was along the shaft not all the way to the clubhead.
Of course, to really validate that the extreme points are always good, we need to test on many more videos with varying conditions, which our sample videos do not have.
(face5, gw3)
Of course, to really validate that the extreme points are always good, we need to test on many more videos with varying conditions, which our sample videos do not have.
(face5, gw3)
Monday, March 3, 2008
Partial Downswing Fitting
We're experimenting a little with fitting the downswing as two separate parts. We're manually identifying the "crossover" frame, the point at which the club head passes 2*Pi (the club directly to the right of the reference point).
The first part of the downswing is being fit a little better.
The second part of the downswing is too gruesome to show. The curve is completely erratic. One likely source of error is that at the end of the swing, the club head is closer to the reference point than the hand, so we choose the wrong end of the line segment to be the club head. An easy way to solve this problem is to only track up to a certain point, such as Pi/2, where the club is directly over the reference point (and is still farther than the hand).
The first part of the downswing is being fit a little better.
The second part of the downswing is too gruesome to show. The curve is completely erratic. One likely source of error is that at the end of the swing, the club head is closer to the reference point than the hand, so we choose the wrong end of the line segment to be the club head. An easy way to solve this problem is to only track up to a certain point, such as Pi/2, where the club is directly over the reference point (and is still farther than the hand).
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