Society of Robots - Robot Forum
General Misc => Misc => Topic started by: Joker94 on May 20, 2010, 02:54:40 AM
-
What do you guys think?
The UAV will be at a constant hight of 200 to 400 feet and it needs to be able to spot a person near a car.
Since i have no experience of the black fins i wouldnt know if it would work ok. would it it?
i dont need a specific answer just for people opinion on the matter
cheers
Joker94
-
Bear in mind that cameras like the Blackfin generate a frame of pixels which is far too big to transmit to another processor. eg 320 x 200 pixels = 64,000 bytes
Equally 64k is a lot of RAM.
Therefore all image processing is normally done on the camera.
The most common feature is to look for blobs eg any rectangles whose pixels are within a min/max colour range.
These blobs are then detected as the camera is transmitting the scan lines - ie the camera hardware doesn't need to store the whole image either.
So if the car is a red car and the person is wearing blue then you stand a chance of detecting and distinguishing them both. But if you need to detect any colour car and a person dressed in any colour then you've got a much bigger job as you are performing shape detection. You would probably need to write that code and then upload it to the Blackfin to replace its default image processing.
-
thanks webbot
i think at this stage we are going with a surveillance style camera and a 10w video transmitter. an i am sure i will have a question or 2 over the next few months
Thanks for your help
Joker94
-
What do you mean by "needs to be able to spot a person near a car."
You mean like autonomous face detection? Or just enough pixels that if you looked at the video feed you could tell it was a person in the car?
-
It has to spot a person near a car from between 200 and 400 feet.
I have ruled out the blackfin though, going with a normal AV camera
i was looking at the blackfin as it had UART but i dont need it anymore.
Cheers
Joker94
-
You didn't answer my question :P
-
Sorry admin.
no nothing that detailed, we just have to be able to see the dummy laying there so we can initiate the bottle drop rig.
Cheers
Joker94
-
The reason I asked is I wasn't sure if you wanted on-board computer vision, or just a camera for normal video.
For normal video, the Blackfin/CMUcam is definitely *NOT* a good choice :P