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Image Analyst


Last seen: Today
32,860 total contributions since 2010

Senior Scientist (male/man) and Inventor 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. 40+ 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, video analysis, thermal, ultraviolet, hyperspectral, CT, MRI, radiography, profilometry, microscopy, NIR and Raman spectroscopy, etc. on a huge variety of subjects. Member of the Mathworks Community Advisory Board. 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

Image Analyst's Badges

  • Personal Best Downloads Level 5
  • Editor's Pick
  • First Review
  • 5-Star Galaxy Level 5
  • First Submission
  • 36 Month Streak
  • Most Accepted 2014
  • Thankful Level 4
  • Grand Master
  • Revival Level 4
  • Knowledgeable Level 4
  • First Answer

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Contributions in
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Answered
Extract email information from webpages/URLs using Matlab
Looks like L is a cell array of web sites, none of which is an email address with @ in it. So why do you think it should find a...

15 minutes ago | 0

Answered
How to find an unclear edge?
Try to denoise your image first. You might try imnlmfit() or a mean shift filter or something like that.

29 minutes ago | 0

Answered
I need help with pixel neighborhood operations
Looks like you've accepted an answer that works (via intensity thresholding) for the image you uploaded. If you want a more rob...

34 minutes ago | 1

Answered
Subroutine using if statement
Lots of stuff wrong with this. For starters, you're passing in the whole x vector into the (poorly-named) X function yet your f...

42 minutes ago | 0

Answered
want to display the x value of the maximum in my graph?
Try this: x=[1 2 3 4 5 6]; y=[5 6 7 6 5 4]; [highest,index] = max(y) plot(x,y); text(x(index), y(index), '\leftarrow') ylim...

1 hour ago | 1

| accepted

Answered
color space plot of image
I believe you're wanting the colorcloud() function. It plots the gamut in 3-D. Not sure what a 2-D plot would be. What do the...

1 hour ago | 0

Answered
What this error 'Dimensions of arrays being concatenated are not consistent' means?
It's thoroughly discussed in the FAQ: https://matlab.fandom.com/wiki/FAQ#.E2.80.9CDimensions_of_arrays_being_concatenated_are_n...

1 hour ago | 0

Answered
How to read pixel labels in pixellabel datastore.
Duplicate of question already asked and answered: https://www.mathworks.com/matlabcentral/answers/850850-the-assigned-pixel-nam...

16 hours ago | 0

Answered
How can i plot three periods of a signal
Try it this way: % t=[0:0.0002:20]; % xc1=cos(2*pi*493.88*t); % argument in cos = 2*pi*t/period. So period = 1/493.88 thre...

16 hours ago | 0

| accepted

Answered
Unable to do subtraction of images in GUI
What is this???? InputImage2 = imresize(InputImage2(value1), [rowsInputImage1 colsInputImage1]); You're saying the image is In...

16 hours ago | 0

Answered
Does anyone know how to improve this code?
Lots of ways. For starters: Use descriptive variable names. Like not sz but [rows, columns, numberOfColorChannels] = size(rgb...

19 hours ago | 0

| accepted

Answered
How do i get the sound of a cosine signal
Scott is right on. For what it's worth, I'm attaching my demo for making a warbling, decaying chirp sound:

20 hours ago | 0

Answered
Eliminate rows from an array
To eliminate the "second half of rows" (like you asked) from your column vector, do this: midRow = ceil(length(data3) / 2); da...

20 hours ago | 1

| accepted

Answered
What changes should I make to get binary images correctly in order for BoundingBox to grab the ROI correctly?
This seems to work for all the images you attached. % Demo by Image Analyst clc; % Clear the command window. close all; %...

20 hours ago | 0

Answered
Why is my workspace empty after running a script?
Something is not right with what you've shown. You have a semicolon after the "a=1" so that means when you type Untitled into t...

1 day ago | 1

Answered
How to eliminate unwanted objects from droplet image to ease droplet identification/sizing and strange imcrop behaviour
First you need to flatten the background. One of the best ways is to take a blank shot with no sample in there to get an image ...

1 day ago | 0

Answered
How to retrieve data points from a grayscale histogram?
Try this: grayImage = imread('cameraman.tif'); % Read in image. counts = imhist(grayImage) % Take histogram grayLevels = 0 : ...

1 day ago | 0

Answered
intensity of dought events
You need to use regionprops(), which will get you both the length of each drought, as well as it's mean value. You can also get...

1 day ago | 0

Answered
How to set which part of the code to comment using a variable?
Once you've got that figured out then, to COMPARE the algorithms, you might want to look into an ROC analysis using the MATLAB f...

1 day ago | 0

Answered
How to make segmented regression line and determine the breakpoints?
The way I do it is to pick a dividing point and then slide that along fitting a line to each side. The dividing point that has ...

1 day ago | 0

Answered
Zooming a portion of figure in a figure.
See attached zooming demo.

1 day ago | 0

Answered
How to do OR operation of two images (DFT and Binary)?
To me this looks like a series of 3 tiles butted together. And you want to find the thin crack that's vertical in the middle ti...

1 day ago | 1

Answered
"Array indices must be positive integers or logical values" for i=2 in loop
The error is thoroughly explained in the FAQ: https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_posit...

1 day ago | 0

Answered
How to check the existence of a variable inside handles?
Instead of delete(handles.obj.pc(index)); try handles.obj.pc(index) = [];

1 day ago | 0

Answered
How can i save images at the end of every iteration?
Try it this way: % By Image Analyst clc; % Clear the command window. clearvars; close all; % Close all figures (except t...

1 day ago | 0

| accepted

Answered
What changes should I make to get binary images correctly in order for BoundingBox to grab the ROI correctly?
Looks like it's working for the images you gave it, however you gave it improperly segmented images. Sometimes you need to adju...

1 day ago | 0

Answered
How to check the existence of a variable inside handles?
Strange that it has fields but no values for the fields. Maybe try clear instead of delete. Or if the field obj is a variable ...

1 day ago | 0

Answered
How to control the visibility of gridlines of an axes through a checkbox in GUIDE?
See my attached demo. In particular, check out these lines of code: % Make the grid color yellow. ax.GridColor = 'y'; ax.Gri...

2 days ago | 0

Answered
Websave / webread : permission denied
Update to handle Mutual Funds: % Demo by Image Analyst to ask Google Finance for today's closing stock price. clc; % Clear com...

3 days ago | 0

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