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#1 2012-07-12 05:07:55

model
Member
Registered: 2011-08-10
Posts: 142

distance from camera to object

Hy guys ,

I want to find distance from camera to object .
A picture is given in this link: http://i1069.photobucket.com/albums/u472/tina12354/anglefind.png

Could any one please help me how to find distance from camera to object .
thanks


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#2 2012-07-12 05:14:49

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,049

Re: distance from camera to object

Hi model

Does the star represent where the camera is?


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#3 2012-07-12 05:18:10

model
Member
Registered: 2011-08-10
Posts: 142

Re: distance from camera to object

hmm yes you can say focal length .


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#4 2012-07-12 05:19:04

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,049

Re: distance from camera to object

Did you try trigonometry to solve this?


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#5 2012-07-12 06:35:28

Bob
Administrator
Registered: 2010-06-20
Posts: 10,053

Re: distance from camera to object


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob smile

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#6 2012-07-12 15:28:02

model
Member
Registered: 2011-08-10
Posts: 142

Re: distance from camera to object

Hy thanks Bob:)

Well i tried to solve that.

if you see this figure :http://i1069.photobucket.com/albums/u472/tina12354/anglefind-1.png

then cos(60) = base /hypo
       1/2      = 100 / y
       y = 200 cm


and sin(60)     = perpendicular / gypo
      sqrt(3) /2 = x / 200
      sqrt(3)*100 = x
      x = 173 cm.

Is it correct ?
So in think distance from cam to object is 173 cm.
Please correct me if i am wrong .
thanks


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#7 2012-07-12 15:46:38

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,049

Re: distance from camera to object

If the distance given is 10cm then those two answers you got must be divided by 10. Otherwise, your answers are correct.


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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#8 2012-07-12 18:55:15

Bob
Administrator
Registered: 2010-06-20
Posts: 10,053

Re: distance from camera to object

hi model

I agree with anonimnystefy.  You started with 10 cm.  200cm is impossibly large.  Did you mean 200 mm ?  Or 20 cm.

Same with 173.  17.3 cm or 173 mm.

Bob


Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob smile

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#9 2012-07-13 00:30:38

anonimnystefy
Real Member
From: Harlan's World
Registered: 2011-05-23
Posts: 16,049

Re: distance from camera to object

Hi Bob

I guess another 0 just slipped in. No biggie.

What I am curious about is what this is for, because I know most model's questions have a practical application behind them.


“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

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