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 Post subject: converting pixal size and resolution to distance?Posted: Thu Jan 07, 2010 3:41 pm
 8086

Joined: Thu Jan 07, 2010 2:52 pm
Posts: 1
Hi, I'm a student at the Springfield High School of Science and Technology-don't let the name fool you, some teachers can't even turn a computer on. My school has entered the FIRST Robotics Challenge and have received a clue in the form of a picture. We have no clue what it is. The link is http://i926.photobucket.com/albums/ad110/greyhour/1stclue.jpg
I know it's possible to compare the the resolution of the image to the dimensions in order to find the distance from the camera lens it was. And from there it's only basic trigonometry. The problem is I don't know how to measure the resolution nor do I know the formula (or formulas) to do the conversion. If anyone has any suggestions, they would be greatly appreciated.

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 Post subject: Posted: Sat Jan 09, 2010 10:49 am
 Java Junkie

Joined: Mon Jun 14, 2004 10:23 am
Posts: 24218
Location: Granite Heaven
Do you know whether the camera has a zoom?

Do you know that that is probably not a photograph?

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 Post subject: Posted: Sun Jan 10, 2010 10:45 pm
 8086

Joined: Sun Dec 20, 2009 4:03 pm
Posts: 10
I am not really up on robotics &
maybe this isn't what you are looking for.

But, from the way the 'acrylic' shield is
attached i don't think it could be much
larger than is shown.

Also, a clue as to what it might be
can be found on the metal pieces
at the bottom of the picture.

At each end there appear to be
'slide' stops.

Hope this helps.

John

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 Post subject: Re: converting pixal size and resolution to distance?Posted: Mon Mar 01, 2010 11:09 pm
 Bitchin' Fast 3D Z8000*

Joined: Tue Jun 29, 2004 11:32 pm
Posts: 2555
Location: Somewhere between compilation and linking
greyhour wrote:
Hi, I'm a student at the Springfield High School of Science and Technology-don't let the name fool you, some teachers can't even turn a computer on. My school has entered the FIRST Robotics Challenge and have received a clue in the form of a picture.

How is the project coming along? I would have loved to be able to compete in something like this during high school. Enjoy it!

greyhour wrote:
I know it's possible to compare the the resolution of the image to the dimensions in order to find the distance from the camera lens it was.

Hmm... what (specifically) do you mean by dimensions? In order to accurately find the size of the item, I think that you need to have a reference object of known size in the picture (like a dollar bill).

Good luck!

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