Steven wrote on Nov 28^th, 2011 at 2:50pm:




I´m coming with you, but take care:  I have no control over my stones....

......yet.

Honder: One deform in the Sling is not perceptible.

Even if one itself then ball with the hand before then head does not fight misshapenly he.

Only the impact deforms then ball.

The new balls are still improved.

Their contents will be no normal sand.

Also the cover will be a little thicker material.

Morphy wrote on Nov 30^th, 2011 at 12:03pm:


Here you are, Morphy

http://www.youtube.com/watch?v=Nd19eMFbTQQ

Morphy wrote on Nov 30^th, 2011 at 12:03pm:



Morphy, that is the main problem of the virtual competition. We have to start the thinking machine to find a simple and effective solution. As you say, the distance between the camera and the slinger, or the focal length of the camera lenses, changes the perspective and can modify the evaluation of the apparent distances. As has suggested Yurek, the slinger could walk the distance, but being different the steps of each person could have differences in the measurement perhaps of 20%. The best would be to estimate the distance from the position of the slinger, by means of some procedure based on the comparison of the sizes of the target and a well-known object located in the position of the slinger. I am imagining vaguely a conical object (i.e. a bottle of known dimensions) located at the position of the slinger and that has an equal angle to which it forms the camera with the target. If the small end of the bottle covers the great end, and both cover the target, the distance could calculate. If later we change the focal length of the camera the bottle would not cover the target. It´s not still very clear to me and I don´t know also if I have expressed it clearly for other.

An easy aid would be a coloured rope.

It changes all 5 m the colour.

10 m green
15 m blue
20 m red

One pulls the rope simply in such a way which is to be recognised it on the video well.
In this manner the position of the camera would make no difference.

Central issue one sees the coloured rope

I would have thought the distance and size of target could relatively easily be judged by the person standing beside the target. Am I correct in thinking a danna (spelling?) is around the size of a human head and I dont know the other dimensions for the rest but relative to humans.
Ofcourse we get tall and small people, but it would be hard to gain more than a metre in advantage by playing with size in comparison. I do agree something like a coke bottle however which is standard could be simpler than the guessing game, but even this would need specific rules (such as the bottle needs to be placed infront of the target in order to establish it is infront of it).

Really like the idea of a contest like this though,

Nemo

Yurek wrote on Nov 30^th, 2011 at 4:17pm:


I like both suggestions but this one has the added idea of forcing someone to be close to as good as the video shows them being. Having to physically take the camera and film while you walk to the target with a wheel or with a rope you measured out on camera will limit how many "takes" one can realistically do. The key though would be to do the measuring before the 10 shots and to do it all in one take. Measuring then throws all in the same clip, unedited.

The other suggestion is faster and would mean smaller video sizes to upload because it would get rid of having to actually walk the distance or measure on video, but I can see someone doing what Yurek said: Taking 200 shots and using the 10 best.

As for target size, if using a Balearic diana, one could simply bring a meter stick up to the target as you're walking to it with your rope or wheel and put the meter stick on the diana for a second to establish scale. Or if one did not want to use a Diana, one could use a commonly available item, like a coke can.

Yes, and, it's one of the great mysteriesof the universe.