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Image Analyst


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30,017 total contributions since 2010

Senior Scientist 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. 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

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Contributions in
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Answered
Counting the number of black pixels in an image
If "mask" is the image you want to count black pixels in, you can either do it like this: numBlackPixels = numel(mask) - nnz(ma...

2 hours ago | 0

Answered
How difficult is it to move license to another computer?
Not hard. Once you have both computers, deactivate it on the old one. In MATLAB: Click the Home Tab, then Help, Lice...

2 hours ago | 1

Answered
Shortest path algorithms in a heatmap.
See Steve's blog: http://blogs.mathworks.com/steve/2011/11/01/exploring-shortest-paths-part-1/

2 hours ago | 0

Answered
2020a prompting for an activation key
Try the "Installation and Licensing" section of the FAQ: https://www.mathworks.com/matlabcentral/answers/faqs

2 hours ago | 0

Answered
problem in installing matlab on my computer
See the FAQ: FAQ. Believe it or not, it's your quickest way to a solution.

2 hours ago | 0

Answered
Polynomial curve fitting and equation of a curve from an image?
I measure all kinds of shapes all the time. It really depends on what you plan on doing with the information after you have it....

10 hours ago | 1

Answered
trouble understanding for loops
You forgot to use input() before the parentheses, among other things. Here is improved code: pv = input('What was your origina...

1 day ago | 0

Answered
Local Binary Pattern(LBP)
See my attached LBP demo.

1 day ago | 0

Answered
use a text from a text box in a GUI
To get a string from an edit text box don't use the old obsolete get(), use the new OOP style: Especie = handles.Especie.String...

1 day ago | 1

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Answered
How do I close all open scripts in the Editor window?
The following snippets may be useful for closing down: m-file editor windows, and/or variable editor windows OPTION 1: % Cl...

1 day ago | 0

Answered
Approximating Probability using Monte Carlo Method
Hint: xy = rand(1000000, 2); or numPoints = 1000000; x = rand(numPoints, 1); y = rand(numPoints, 1); Look up norm in the h...

2 days ago | 0

Answered
Removing a column from any sized array help!!
Hint: m = magic(4) m(:,3) = []

2 days ago | 0

Answered
How can i convert some of images Matrices to be square symmetric Matrices?
Matrices do not need to be square to do PCA on them. Attached is an example where I do PCA on the 3-D color gamut of an RGB ima...

2 days ago | 0

Answered
Is there a command that writes code in another program?
fprintf() will do that. fid = fopen('program.m', 'wt'); % Open the file for writing. fprintf(fid, 'disp(x+variable^2)'); % Wri...

2 days ago | 1

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Answered
Finding a number with conditions while using for loop
You need a continue. And you should print i, NOT n. Then, after the fprintf() put a break if sqrt(i) < 120 continue; % S...

2 days ago | 1

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Answered
How do I remove all fields of a structure that have at least one NaN?
If you want, you can try to use structfun() but it's rather cryptic. darova's solution is much more intuitive and readable. By...

2 days ago | 1

Answered
confusion matrix vs roc 100%
Why do you think you'd get any more points on the ROC curve than 1 from a single confusion matrix? You won't. One confusion ma...

2 days ago | 0

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Answered
Rgb2gray error
Convert to gray scale: Filelist= dir('Clipboard*.png'); numberOfFiles = length(Filelist); for k = 1 : numberOfFiles % Don't u...

2 days ago | 0

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Answered
Sum of values stored in an array of handles
Are you SURE you set the Value property of the buttons when you created them? You'd need to have done that for your code, thoug...

2 days ago | 0

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Answered
seperating higher and lower levels of a pulse
Please post a screenshot (a PNG file - it's easier for us to see immediately without saving your fig and then moving over to MAT...

2 days ago | 0

Answered
How do I manage and pass information between my main app and all of its children?
You can find some help in the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI....

2 days ago | 0

Answered
write an image file
You need to scale it to 0-255 first (which is what [] does), and then cast to uint8: image8 = uint8(rescale(im, 0, 255)); imwr...

3 days ago | 1

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Answered
How to view images that were classified by mistake?
Are you using confusionchart() or confusionmat()? So, either way, you have a list of the true labels and the predicted labels. ...

3 days ago | 0

Answered
how to detect horizontal or vertical lines code on OCTAVE
if y1 == y2 % Horizontal line. elseif x1 == x2 % Vertical line. else % Slanted line. end

3 days ago | 0

Answered
how to fit ellipse to an image with cylinderical shape
First of all, don't do an edge detection. I don't know why people always think edge detection is the first step in any image pr...

4 days ago | 1

Answered
How to find the distance of a point to a line (knowing all the points)?
See my demo. The GetPointLineDistance() function you want is in there. % Get the distance from a point (x3, y3) to % a line d...

4 days ago | 0

Answered
How to calculate the highest consecutive negative results in my code
This is trivial if you have the Image Processing Toolbox. Simply use regionprops(): v = [2 4 3 -1 -2 5 7 8 -1 -0.3 -1 -1 -1 -1...

4 days ago | 0

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Answered
Finding Area of Polygon defined by roipoly
To get the answer in real world units like m^2 you have to get the area, using one of these 3 ways: areaInPixels = polyarea(x, ...

4 days ago | 0

Answered
Multiple conditional statements with logic
Try this: too_young = under_age(22, 21) too_young = under_age(11, 25) too_young = under_age(33) too_young = under_age(18) ...

4 days ago | 1

Answered
Comparing numerical values of a 5x2 cell
This will do it: ca = { 'Red Car', 50; 'Blue Car', 45; 'Green Car', 30; 'Black Car', 60; 'Yellow Car', 55} speeds = vert...

4 days ago | 0

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