Stereo Imaging – S2

Stereoimaging

Using Stereo Webcam program

And Jasc Paint Shop Pro 8 program

Obtained many testers of creating stereoimages.

EXAMPLE

Unfortunately – best to save images as bmp images

So as a treat…(prepare your 3-D glasses)

Pdsimg.jpl.nasa.gov/project/mpf/mprv_0001/document/rcinst.htm

NASA surely can’t be wrong!!!

We’ll find out anyway

•Internet search

Calibration

•Hit on NASA website

Being NASA’s policy – Everything’s complicated!

On ‘Sojourner’, flat black sheet with 17 x 17 grid of white circles used, with perfect separation and probably expensive equipment

Being a student’s policy – Everything must be simplified (dumbed down)

Bit of A4 lined paper with a ruler, a pencil/permanent marker, and a Rich.

Extremely Cost Effective!!!

1 2

1 2

Initially the Sine rule is used to determine the distance from one camera (say camera 2), to the object.

Then basic trigonometry is used to ascertain the perpendicular distance from the system.

Once these two distances are know, the distance to any point, of known distance relative to the camera, can be calculated.

)sin/()sin/( BbAa

a

b

A

B bx

C

BAC 180

xCb )sin(

Where (a) is known and angles B and A can be found from the image obtained.

a

a

a

a

Camera

Screen

To find angles B, C and A, a screen of known size is placed in front of the camera and moved closer until it covers the whole field of view. The distance from camera to screen is recorded.

Screen CameraD

y

d

y)/(tan 1 dyD