Rank: 54 based on 579 downloads (last 30 days) and 14 files submitted
photo

David Young

E-mail
Company/University
University of Sussex
Lat/Long
50.86579132080078, -0.086335003376007

Personal Profile:
Professional Interests:
Image Processing

 

Watch this Author's files

 

Files Posted by David View all
  • 1 - 5 of
  • 14
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
09 Dec 2011 Screenshot Image correspondences using cross-correlation Find matching features in pairs of images using normalised cross-correlation: class file and demo. Author: David Young image correspondence, pixel correspondence, stereo vision, image registration, optical flow, image matching 88 16
  • 5.0
5.0 | 4 ratings
09 Dec 2011 Screenshot Affine optic flow Estimates the parameters of an affine (first-order) optic flow model from two images. Author: David Young image motion, optical flow, active vision, logpolar, affine, foveal vision 52 5
  • 5.0
5.0 | 2 ratings
09 Dec 2011 Image gradients with Gaussian smoothing Image grey-level gradients are estimated using Gaussian smoothing followed by differencing. Author: David Young image processing, image smoothing, gaussian smoothing, gradients, first derivative 24 0
07 Dec 2011 Screenshot Extended Brookshear Machine emulator and assembler Emulator and assembler for a simple computer, a teaching aid for computer science courses. Author: David Young machine code, assembler, gui, education, teaching, emulator 8 0
29 Sep 2011 A multidimensional map class MapN provides a map class similar to containers.Map, but with multidimensional keys. Author: David Young map, container, containers, memoize, containersmap, oop 5 0
Comments and Ratings by David View all
  • 1 - 5 of
  • 34
Updated File Comments Rating
01 Jul 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young

Hello Abdelmoumen, the code will detect partially hidden circles already. Basically if a fraction P of the circle is visible, the peak for that circle will receive P times the number of votes that the full circle would. Whether a small part of circle is detected depends on the amount of noise in the image - that is, how many other edges are present.
22 Jun 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young

Hello setareh, I'm sorry but it is very difficult to answer this kind of query. I'd need to work on the project myself to figure out what kind of code to write - everything depends on the details. I hope you get it figured out.
18 Jun 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young

Abdelmoumen, please see my reply dated 30 September 2010.
18 Jun 2013 Image correspondences using cross-correlation Find matching features in pairs of images using normalised cross-correlation: class file and demo. Author: David Young

katia - sorry not to get back sooner. I hope you've solved the problem by now. It's easy - just look at the code that does the display for the demo and modify it to do what you want.
11 May 2013 Gabor function masks Create Gabor-function convolution masks Author: David Young

Tony: click the link that says "Download Submission". It's near the top right of the page.
Comments and Ratings on David's Files View all
  • 1 - 5 of
  • 91
Updated File Comment by Comments Rating
01 Jul 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young Young, David

Hello Abdelmoumen, the code will detect partially hidden circles already. Basically if a fraction P of the circle is visible, the peak for that circle will receive P times the number of votes that the full circle would. Whether a small part of circle is detected depends on the amount of noise in the image - that is, how many other edges are present.
01 Jul 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young Abdelmoumen

Hello David
Thanks for the answer.I have another question, Could this code be improved to detect patially hidden circles in an image.
Thanks

22 Jun 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young Young, David

Hello setareh, I'm sorry but it is very difficult to answer this kind of query. I'd need to work on the project myself to figure out what kind of code to write - everything depends on the details. I hope you get it figured out.
19 Jun 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young setareh

Hello David,
I have a question, I used the imfindcircles command to detect one circle in an image, now if I want to use the information of this circle t find a circle in another image, what should I do?
for example if I know the difference between the radius's and the centers.
I really appreciate your time.
18 Jun 2013 Hough transform for circles A Hough transform function for detecting circles, optimised to allow search over radii. Author: David Young Young, David

Abdelmoumen, please see my reply dated 30 September 2010.
Top Tags Applied by David
  • 1 - 5 of
  • 63
image processing, filtering, image analysis, convolution, 2d
Files Tagged by David View all
  • 1 - 5 of
  • 16
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
09 Dec 2011 Screenshot Image correspondences using cross-correlation Find matching features in pairs of images using normalised cross-correlation: class file and demo. Author: David Young image correspondence, pixel correspondence, stereo vision, image registration, optical flow, image matching 88 16
  • 5.0
5.0 | 4 ratings
09 Dec 2011 Screenshot Affine optic flow Estimates the parameters of an affine (first-order) optic flow model from two images. Author: David Young image motion, optical flow, active vision, logpolar, affine, foveal vision 52 5
  • 5.0
5.0 | 2 ratings
09 Dec 2011 Image gradients with Gaussian smoothing Image grey-level gradients are estimated using Gaussian smoothing followed by differencing. Author: David Young image processing, image smoothing, gaussian smoothing, gradients, first derivative 24 0
07 Dec 2011 Screenshot Extended Brookshear Machine emulator and assembler Emulator and assembler for a simple computer, a teaching aid for computer science courses. Author: David Young machine code, assembler, gui, education, teaching, emulator 8 0
29 Sep 2011 A multidimensional map class MapN provides a map class similar to containers.Map, but with multidimensional keys. Author: David Young map, container, containers, memoize, containersmap, oop 5 0

Contact us