Rank: 19 based on 1086 downloads (last 30 days) and 8 files submitted

Image Analyst

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Personal Profile:: Senior Scientist in one of the world's 10 largest industrial corporations doing image analysis full time. Ph.D. in Optical Sciences specializing in imaging, image processing, and image analysis. 33+ years of military, academic, and (mostly) industrial experience with image analysis programming and algorithm development. Experience designing custom light booths and other imaging systems. Experience with color and monochrome imaging, thermal, ultraviolet, CT, MRI, radiography, profilometry, microscopy, etc. on a huge variety of subjects. Be sure to click "View All" in my File Exchange to see ALL of my demos and tutorials: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
Professional Interests:: Image analysis and processing

Files
Watch Lists

Files Posted by Image				View all 1 - 5 of 8
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
19 Sep 2012	Color Checker Chart Synthesize a perfect version of the X-Rite Color Checker chart. Author: Image Analyst	image processing, color, bad	50	2	3.0 3.0 \| 2 ratings
16 Mar 2012	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	demo, image analysis, segmentation, image processing, potw, pick of the week	536	63	4.58824 4.6 \| 36 ratings
19 Apr 2011	Color segmentation by Delta E color difference User draws region and this finds pixels in the image with a similar color, using Delta E. Author: Image Analyst	segmentation, color, image processing	94	12	4.4 4.4 \| 5 ratings
12 Nov 2010	Thresholding an image GUI with sliders to set a threshold range on an image. Make a binary image. Author: Image Analyst	binarize, threshold, binary image, image processing	86	4	5.0 5.0 \| 1 rating
11 Oct 2010	Custom-shaped histogram Transform an image to have any histogram you want. Author: Image Analyst	color detection, fun, segmentation, histogram, histogram equalizatio..., demo	61	4	4.5 4.5 \| 2 ratings

Comments and Ratings by Image		View all 1 - 5 of 49
Updated	File	Comments	Rating
13 Mar 2013	contour_following CONTOUR_FOLLOWING takes a B&W image, returns the sorted contour points. Author: Francois Mourougaya	It's not clear what this code does that the function bwboundaries(), in the Image Processing Toolbox, already does. Can you explain the differences, if any?
15 Feb 2013	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	Nina, to do that exactly, you'd need to use John D'Errico's interparc program. Look for it in the File Exchange. You can also subsample, like thisBoundary(1:10:end,2) though these won't necessarily be evenly spaced in distance.
21 Oct 2012	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	If anyone has any questions about their own specific images, they should ask in the Answers forum (look at the menu above). Do not put your specific question here as a comment on this program. I can help there in Answers. This page is not meant to be a discussion forum.
20 Sep 2012	Color segmentation by Delta E color difference User draws region and this finds pixels in the image with a similar color, using Delta E. Author: Image Analyst	ajit, if there is a brightness change, there is a color change. If you want to detect a hue, regardless of it's brightness, then you can use my HSV color segmentation demo and just threshold on the hue value. However skin is a boomerang-shaped gamut and can't be gotten by any simple carving up of the gamut in any 3D color space, no matter which one you pick. You'd need to carve out the boomerang shape, not just a hue sector or a delta-E ball shape.
22 Aug 2012	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	Christie, when you adapted it, you had it read in a color image, even if it doesn't look like it. Do this to prove: [rows columns NumberOfColorChannels] = size(yourImage). Use rgb2gray() right after you call imread() to convert your color image into a gray scale image.

Comments and Ratings on Image's Files			View all 1 - 5 of 149
Updated	File	Comment by	Comments	Rating
03 Jun 2013	Color segmentation by Delta E color difference User draws region and this finds pixels in the image with a similar color, using Delta E. Author: Image Analyst	Atanas	Hello, may I ask how can I segment every color object in separate picture, I mean for example on the next picture to segment only red object (red colored off course), on the next blue object and so on. Thank you in advance for the help :)
24 May 2013	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	Bilheux, Jean	Looking at the code taught me a few new tricks ...very nice.
14 May 2013	maze_solution Solves mazes using mathematical morphology - find the route through the maze. Author: Image Analyst	Ansari, Iman
12 May 2013	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	Chethan	Awesome, a nice presentation on feature extraction.
06 May 2013	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	Arul

Top Tags Applied by Image	1 - 5 of 18
image processing, color, color classification, color detection, demo

Files Tagged by Image				View all 1 - 5 of 11
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
19 Sep 2012	Color Checker Chart Synthesize a perfect version of the X-Rite Color Checker chart. Author: Image Analyst	image processing, color, bad	50	2	3.0 3.0 \| 2 ratings
13 Apr 2012	Checking the similarity of two 2D images using a checker-board with adjustable tile transparency This is a part of InSPIRE for checking the similarity of two figures possibly after registration. Author: Rex Cheung	image processing, registration, image registration	5	0
16 Mar 2012	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	demo, image analysis, segmentation, image processing, potw, pick of the week	536	63	4.58824 4.6 \| 36 ratings
19 Apr 2011	Color segmentation by Delta E color difference User draws region and this finds pixels in the image with a similar color, using Delta E. Author: Image Analyst	segmentation, color, image processing	94	12	4.4 4.4 \| 5 ratings
12 Nov 2010	Thresholding an image GUI with sliders to set a threshold range on an image. Make a binary image. Author: Image Analyst	binarize, threshold, binary image, image processing	86	4	5.0 5.0 \| 1 rating

Currently Watching
Type	Description
File	Image Segmentation Tutorial ("BlobsDemo")
File	SimpleColorDetection
File	Simple color detection by hue
File	Custom-shaped histogram
File	Color segmentation by Delta E color difference
File	export_fig

Files Matching Image's Watch List				View all 1 - 5 of 6
Updated	File	Tags	Downloads (last 30 days)	Comments	Rating
28 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats. Author: Oliver Woodford	anti alias, figure, embed, pick of the week, export figure, transparent	2425	259	4.95812 5.0 \| 212 ratings
16 Mar 2012	Image Segmentation Tutorial ("BlobsDemo") Image Processing Tutorial to demonstrate the basic concepts to beginner users. Author: Image Analyst	demo, image analysis, segmentation, image processing, potw, pick of the week	536	63	4.58824 4.6 \| 36 ratings
19 Apr 2011	Color segmentation by Delta E color difference User draws region and this finds pixels in the image with a similar color, using Delta E. Author: Image Analyst	segmentation, color, image processing	94	12	4.4 4.4 \| 5 ratings
11 Oct 2010	Custom-shaped histogram Transform an image to have any histogram you want. Author: Image Analyst	color detection, fun, segmentation, histogram, histogram equalizatio..., demo	61	4	4.5 4.5 \| 2 ratings
19 Aug 2010	Simple color detection by hue Detect yellow regions in an image via thresholding in HSV color space. Author: Image Analyst	color detection, color, color classification, image processing	121	17	3.85714 3.9 \| 10 ratings

Comments and Ratings Matching Image's Watch List			1-5 of 480
Date	File	Comment by	Comments	Rating
27 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats.	Sam	Jannik fix works for the Issue I had (reported on 18 Jun 2013) using ubuntu 13.04 running Matlab R2012b. Thanks Jannik. Really helped me out.	Comment only
26 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats.	Jannik	I also get a ghostscript error: Error: /undefined in --definefont-- Operand stack: mwa_cmmi10 --dict:11/20(L)-- Font definefont --dict:30/32(L)-- unknownerror Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1900 1 3 %oparray_pop 1899 1 3 %oparray_pop --nostringval-- 1883 1 3 %oparray_pop 1771 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- 1762 2 3 %oparray_pop --nostringval-- --nostringval-- 1850 2 4 %oparray_pop --nostringval-- Dictionary stack: --dict:1173/1684(ro)(G)-- --dict:0/20(G)-- --dict:82/200(L)-- --dict:1173/1684(ro)(G)-- Current allocation mode is local Last OS error: No such file or directory GPL Ghostscript 9.07: Unrecoverable error, exit code 1 when using export_fig with Matlab 2013a and ArchLinux. I solved this issue by clearing the LD_LIBRARY_PATH enviroment variable before executing gs by replacing system(sprintf('"%s" %s', gs_path, cmd)); with system(sprintf('export LD_LIBRARY_PATH=""; "%s" %s', gs_path, cmd)); in the ghostscript.m file. Maybe this will help in case of other ghostscript issues as well.	Comment only
24 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats.	Sanka	Brilliant script. Some much time is saved by avoiding the post-processing I used to do to get publication quality figures/images.	5
18 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats.	Sam	Great script but I updated my linux machine and now I am getting the following error. Any Ideas?? Error: /undefined in /findfont Operand stack: 120 Helvetica ISOLatin1Encoding Helvetica Helvetica Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1916 1 3 %oparray_pop 1915 1 3 %oparray_pop --nostringval-- 1899 1 3 %oparray_pop 1787 1 3 %oparray_pop --nostringval-- %errorexec_pop .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- 1868 5 5 %oparray_pop Dictionary stack: --dict:1180/1684(ro)(G)-- --dict:0/20(G)-- --dict:82/200(L)-- --dict:97/160(L)-- --dict:9/85(L)-- Current allocation mode is local Current file position is 10662 GPL Ghostscript 9.07: Unrecoverable error, exit code 1 Error using imread (line 368) File "/tmp/tp0ad5cd83_0088_4c9e_9aa1_d189edc9c4ea.tif" does not exist. Error in print2array (line 95) A = imread(tmp_nam); Error in export_fig (line 327) [A tcol] = print2array(fig, magnify, renderer);	5
14 Jun 2013	export_fig Exports figures nicely to a number of vector & bitmap formats.	Oliver Woodford	Nicky: That's difficult to fix in export_fig. However, a workaround is to draw the grid lines or the axis bounding box manually to be able to get the desired ordering.	Comment only