How to detect a triangle of any dimensions from an image(project on traffic sign board identification and alerting driver)

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shyam
shyam 2011-7-22
NOTE:im truly a dummy regarding matlab i have read some paper on this topic,they in brief say to take the image and 1.*threshold* and then 2.*denoise* and then 3.*perform hough transfor*m on it to obtain the triangle or diamond shapes from image(i don't know how to do this particularly) 4.and then* compare* the obtained shape from predefined images
well can any one code this stuff for me,i wazz pretty tired of googling this stuff......plzz guys help me out with some code :)

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回答（2 个）

Harsha Vardhan Rao Avunoori
I have few questions regarding the above posted question...
1.What kind of image is it ? 2.What kind of threshold(static or dynamic) ? 3.By Denoising are you referring to a specific technique ?
Instead of using Google for the code you can have a look at the functions in MATLAB which will help you in your project.
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shyam
shyam 2011-7-23
i would be taking images countinously from my web cam,
*1.what kind of image*
for example see this image
<http://us.cdn4.123rf.com/168nwm/msanchez/msanchez0907/msanchez090700005/5183078-a-bright-yellow-cow-sign-along-a-country-road.jpg>
original image wont be exactly like this, but a bit noisy
*2.what kind of threshold*
:) im a beginner suggest which would be better
*3.denoising* in the sense just to remove all the un wanted components which come in the way during hough transform at last the shape has to be detected
Walter Roberson
Walter Roberson 2011-7-23
The correct url is
<http://us.cdn4.123rf.com/168nwm/msanchez/msanchez0907/msanchez090700005/5183078-a-bright-yellow-cow-sign-along-a-country-road.jpg

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Walter Roberson
Walter Roberson 2011-7-23
In any image, there are an infinite number of triangles of dimension small enough to each fit within an individual pixel (e.g., dimension 0).
In your image, there are a fair number of triangles that could be found in the sand.
The largest triangle in your image is a bit difficult to determine at the resolution of the posted image, but it appears to me that possibly it would be the triangle at the bottom left corner, with the hypotenuse being the shadow of the sign and portions of the left edge and the bottom edge forming the other two edges of the triangle.
There is large yellow object in the image that would seem to be the natural object to be searching for, but unfortunately it is decidedly not triangular.
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shyam
shyam 2011-7-23
i have kept just an example image,i understand ur intention ,i accept it ,but if suppose i want to detect a triangle of certain perimeter to a range........can i achieve it,
i think u hav gone through my project its to detect a traffic sign board from image...

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