150 reputation
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bio website gray-suit.blogspot.com
location Hong Kong, Vancouver
age
visits member for 3 years, 1 month
seen Apr 7 at 2:00

Hi!


Nov
18
comment How do you get 3D gradient direction and magnitude?
Thanks, but i would like to have a way specific to Gradients.
Nov
16
comment How do you get 3D gradient direction and magnitude?
may i know why it is cos instead of atan (as seen in 2D) case? And i am still a bit confused, can your solution be applied to Gradients ? The reason why i am asking because the mag and ang should be able to be derived from the gradients. My apologies i am still confused. Thanks.
Nov
16
comment How do you get 3D gradient direction and magnitude?
hmmmm, could it be Gx/Gx = 1? Anyway in your solution, i think Beta / r should be y / r? and gamma / r should be z /r ? and r should be that certain axis ? say x, cos (alpha) = Gx / Gx, cos(beta) = Gy/Gx, and cos(gamma) = Gz / Gx ? That's why you stated in the comments that 2 is enough? If these are correct, i'll accept your answer. Thanks.
Nov
16
comment How do you get 3D gradient direction and magnitude?
Interesting, how come in my 2D case, i only need one angle (as shown in the question)? Thanks once again.
Nov
16
comment How do you get 3D gradient direction and magnitude?
thanks, say, W.R.T to x-axis (same thing as in the 2D case), sorry, im a bit confused, in 2D case, i 'll get one value for the angle (deg/rad). Does that mean, using your answer, i would get 3 values? Thanks very much again.
Nov
16
asked How do you get 3D gradient direction and magnitude?
Jul
7
accepted Homotopy and watershed
Jul
6
awarded  Scholar
Jul
6
awarded  Supporter
Jul
6
accepted Reconstructing a ring from a stack of 2D images (radially aligned)
Jul
6
asked Reconstructing a ring from a stack of 2D images (radially aligned)
Jun
2
awarded  Student
Jun
1
comment Homotopy and watershed
Okay, i'll ask on Math.SE then. Thanks.
Jun
1
comment Homotopy and watershed
@Kaveh, i believe this is not entirely for Math. SE. homotopy is vastly seen in computer science. If that's the case, a lot of the image processing problems that were once here should be penalized too.
Jun
1
asked Homotopy and watershed