Comments for Cris's Image Analysis Blog

Comment on DIPimage 2.4 released by Cris Luengo

Cris Luengo — Tue, 17 Jan 2012 20:32:51 +0000

Hi Geert! We miss your hugely productive programming skills! :)

Comment on DIPimage 2.4 released by Geert

Geert — Tue, 17 Jan 2012 17:53:50 +0000

Great to see that DIPimage is still in active development!

Comment on Gaussian filtering by Cris Luengo

Cris Luengo — Fri, 13 Jan 2012 08:38:15 +0000

Hi Ricky, Using DIPimage you can generate an image with Gaussian white noise very easily: noise(newim) does the trick. You can read some more about random numbers in this post.

Comment on Gaussian filtering by Ricky Bangel

Ricky Bangel — Thu, 12 Jan 2012 23:08:32 +0000

Dear Professor,

I am trying to use an artificially generated Gaussian white noise image to calculate the MTF of a camera. I will be using the Fourier Tranform to get my MTF value. However, I am having trouble generating such an image. Can you please provide me some guidance into how I should go about this?

Comment on Bresenham’s line drawing algorithm in any number of dimensions by Cris Luengo

Cris Luengo — Mon, 12 Dec 2011 10:20:56 +0000

Neam, I’m not sure what you are asking… Please clarify your question!

Comment on Bresenham’s line drawing algorithm in any number of dimensions by neam sal.

neam sal. — Sat, 10 Dec 2011 18:12:26 +0000

please,how can i drive a 3D bresenham from 2d ???

thanks in advance

Comment on Bresenham’s line drawing algorithm in any number of dimensions by Cris Luengo

Cris Luengo — Wed, 16 Nov 2011 12:57:31 +0000

Hi Elhassan,

The voxel spacing should not at all affect the algorithm. A straight line stays straight after scaling one dimension.

Comment on Mechanical simulation for image segmentation by Cris Luengo

Cris Luengo — Wed, 16 Nov 2011 12:55:15 +0000

Hi Nelval, Sorry, I don't have any code without DIPimage. gradmag simply computes the gradient magnitude. In this post I explain how to compute a Gaussian derivative without using DIPimage. Simply compute the x and y derivatives (dx and dy), then compute sqrt(dx.^2+dy.^2). get_subpixel interpolates in the image. You should be able to replace it with interp2.

Comment on Bresenham’s line drawing algorithm in any number of dimensions by Elhassan

Elhassan — Wed, 16 Nov 2011 09:07:54 +0000

Hi Cris

What if I have a volume and I need to put a line between two point inside it. The volume has different sample size in each dimension, i.e the spacing between voxels are (0.5,0.5,2). how will this affect the algorithm.

Regards
Elhassan

Comment on Mechanical simulation for image segmentation by Nelval

Nelval — Tue, 15 Nov 2011 18:36:52 +0000

Hi, your post is quite intersting however is it possible to get a version working without the DIP toolbox?
I got some troubles to understand your gradmag function and get_subpixel, are there any alternatives?