How can i measure distance ?

i am making afire fighting robot that us camera to detect the fire i made the vi which find the fire through match pattern but now i want to measure the distance between the camera (which on th robot ) and the fire (which located in the image using match pattern) so how can i measure this distance?
khaledyr

Ok... this is sad, I should be asleep now instead I'm here thinking about this problem.
I've worked out how to do the distance caluclation with no extra H/W and only 1 camera - as Henrik said, the standard solution is triangulation, but you just want to measure distance, so I'm going to assume you're already pointing in the right direction.
Assumptions:
1) It is usual to use triangulation to to measure intenisity, this is because light will have 2 different distances to travel from source to sink.
2) It is possible to use 1 sink if you use mirrors to increase the path of the light so you can have 2 seperate source -> sink distances.
3) having 2 cameras (sinks) next to each other, one covered with a physical filter would have the same effect as the amount of light reaching the 2 sinks from the source will be different.
... following on from 3, it can be assumed that taking 1 image and applying 2 levels of filtering to it before processing will give the same result as if we had 2 different images. Careful setting of the software filter level will then allow it to remain contstant and then the system can be calibrated just as any other system would be calibrated:
Measure the intensity of the source from sink A at distance X
Measure the intensity of the source from sink B at distance X
Measure the intensity of the source from sink A at distance Y
Measure the intensity of the source from sink B at distance Y
If Y=2X the calibration calulation is easy....
Hope this provides more food for thought.
James
P.S. Lynn - currently a firefighter and worked for the emergency services ehh? Always good to see your posts when you have something to add. (Firefighter / Software programmer - what's the difference?)
Message Edited by James W on 04-22-2010 10:56 PM
Message Edited by James W on 04-22-2010 10:56 PM

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