[FoRK] question for you guys

Stephen Williams sdw at lig.net
Sat Jun 25 09:51:40 PDT 2011

Definitely stop signs are interesting, although, even in the US, there are different sizes.
Bills are somewhat good, however as they "age" through use, the paper will shrink from microwrinkles, absorbing moisture, etc. so 
they aren't perfect.

Height of a human, though variable, is still good enough to get you in the ballpark.

CDs are perfect if you one one, although they are reflective and therefore hard to see.

Lightbulbs are pretty standard.  Doors might be pretty standard to a few sizes.

Laptop / tablet sizes.

A measured piece of string, steel, cloth, etc.

Simply move the camera a certain distance and use that distance and stereo changes to infer size and distance.


On 6/25/11 8:02 AM, Gregory Alan Bolcer wrote:
> You have to use the same thing everywhere or you can have a library of commonly occurring things?
> http://tinyurl.com/worldcurrencies
> http://www2.geog.okstate.edu/users/lightfoot/stop.html
> On 6/25/2011 4:37 AM, Damien Morton wrote:
>> You are in the middle of nowhere, in any country in the world, but not so
>> remote that you dont have internet.
>> You want to send photos of a large, flat object to a service which will then
>> measure that object.
>> To measure the object accurately, there need to be some rectangular or
>> circular reference objects of known size in the photos.
>> Ideally some coded photogrammetry targets should be printed and used.
>> If you dont have a printer, then A4 or US Letter paper sheets can be used.
>> These are pretty much the ideal size.
>> No paper, then credit cards can be used. Smaller than ideal, a problems with
>> the printing on them, but usable.
>> Can anyone think of any other common flat rectangular or circular objects
>> that have standardised sizes globally?
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