EGGN 512 - Lecture 13-2 Hough

EGGN 512 Computer Vision

[emineeves]

Hi, can u please explain the conditon - if d<=1. I dont understand what the variable 'd' is for . Thanks

[fadysamy]

Hi, can u please explain the conditon - if d<=1. The meaning of variable 'd' isn't clear. Thanks

[droy]

I'm very confused at the range given to rho (-144, 144) about 2 minutes in to the video. Are you estimating the value? It seems like the actual value for the diagonal should be 141-142 approximately.

[sharperguy]

Does it make sense to perform non-maximum suppression on the canny edge map before trying the hough transform?

[HoffWilliam]

The Canny edge detector already does non-maximal suppression when finding the edge points, so I would say no.

[xxxccc]

Thank you so much!!!! Really well explained.

[pranavnatu]

Can someone explain what happens when E(iy, ix)~=0 ?

[yashevalekar]

I don't understand the significance of d here, I tried implementing this code in python but getting error in accumulator value.
Can you please help??

[sharperguy]

Oh ok I see so that's part of the Canny algorithm. Makes sense now thanks.

[salaheddinhosseinzadeh]

Hi William,
Great video, I never came a cross such a comprehensive explanation of Hough Transform.

BTW, I think there is a little error 4 minutes into the video, the blue curve is wrong I think and it leads to an incorrect intersection between the green and the blue curves. I think the blue curve needs to be inverted maybe!

Thanks a lot for sharing your knowledge and experience.

[luisg.camara]

Great explanations but noises with the mouth are distracting