On 10/05/13 10:38,
g.ca...@uea.ac.uk wrote:
> The comparison of two bowlers would still be subject to the same
> problem of the lack of temporal resolution of the film/video; the
> difference between FM and F is about half a frame, whether assessing
> the exact speed or making a comparison.
I would have expected that if the frames were "good enough",
then half a frame would be just about on the limit of resolution,
and if we had, say, ten balls to average over, then a meaningful
estimate would be possible. Unfortunately, those are two big ifs.
There is quite a lot of footage out there, but I haven't found any
of [eg] Tyson which is usable. See, for example,
http://www.britishpathe.com/video/typhoon-tysons-test-match
and
http://www.youtube.com/watch?v=b5-WYHd5_d0
[the former including a nice clip of Statham's run-up from the
side]. If you freeze the film, it looks like a "Spot The Ball"
competition. I don't know whether it's possible to enhance the
film to the point where the ball is visible? Or perhaps it's my
screen [though the ball is easily visible in more recent stock,
with better camera positions, and, of course, esp in colour].
Anyone have links to good clips?
Ideally, we'd have pictures from square to the wicket
with seven or eight clearly-visible dots showing where the ball
is in each frame.
A second problem is that not much cricket was filmed in
those days. Tests, perhaps Gents vs Players, the Roses match,
and that was about it. The newsreel films would give you about
two minutes. Several of the players mentioned by Robert would
barely have featured on professional film/TV. Of course, it's
possible there is much more in the archives than was ever made
public -- but then researching it would be a serious undertaking,
not something "we" could do from our computers.
> There just is not sufficient
> information in the video/film, which is why Hawkeye uses multiple
> *high speed* cameras.
I'm not convinced that there couldn't be. Hawkeye is
doing something which needs much greater precision. As above,
whether there is in fact sufficient film is another matter.
> If a meaningful estimate could be gathered in this way, you can be
> sure it would have been investigated.
Again, not convinced. It would require a combination of
expertise in several areas together with sufficient interest and
sufficient resources. If Robert could be persuaded to chip in,
say, �50K, then he might find some volunteers. He can't expect
others to do it for him for free.
--
Andy Walker,
Nottingham.