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Image Analyst


28,516 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

Image Analyst's Badges

  • 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
How to read a text file on a specific line having string and numeric data
You forgot to attach the file with the paper clip icon. Please do so. You could read in a line at a time with fgetl() and, if ...

1일 ago | 0

Answered
gradient issue for matlab
If M is your matrix, have you tried imgradientxy()? [gx, gy] = imgradientxy(M); % Requires Image Processing Toolbox.

2일 ago | 0

Answered
regionprops circularity value >1 and 0 ?
It seems like you're getting circularities less than 1 for perfectly rectangular blocks. The formula is not that accurate for s...

4일 ago | 0

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Answered
return row index of values greater than 0 to a 3 dimensional array
Try this: A = [2,-4,-0.5,0.34;0.01,4,-0.5,0.34;-10,4,-0.2,0.6;-10,4,-0.2,0.6;-19,15,-0.7,0.6]; [rows, columns] = find(A > 0)

5일 ago | 0

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Answered
limits are too large
Try this: clc; clear all; M = 100; N = 100; u = linspace(0,.1,M); v = linspace(0,.2,N); [U, V] = meshgrid(u,v); X = ...

5일 ago | 0

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Answered
How to check Excel sheet data of one with Excel sheet data of another on matlab and print the output on another Excel sheet
To compare, use subtraction or the usual comparitive operators like ==, >=, <=, and ~=.

5일 ago | 0

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Answered
How can I recognize shapes of simple geometrical objects using optimization tools
Attach an image. In the meantime, see my attached shape recognition demo.

5일 ago | 0

Answered
a and b constant
You say "The equation would be x= a*y+b" and this is the opposite to the way people usually do things, but it can be done. Just...

5일 ago | 0

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Answered
Need to find how many times in the matrix the Value 1 goes to Value 2
Here's one way: % Define data A{1} = [1 3 4 0]; % 4 elements (customers) A{2} = [4 2 3 1 5 3 5 2 1 2]; % 10 elements (custome...

5일 ago | 0

Answered
How to solve a Multinomial Distribution IN MATLAB
I believe that formula in MATLAB would be p = factorial(10) / (factorial(2) * factorial(5) * factorial(3)) * (0.225)^2 * (0.544...

5일 ago | 0

Answered
Timing concerning certain functions, in this case a convolution.
See attached manual convolution. Yes, it will be very slow. This is because you need to access every single element in the e...

6일 ago | 0

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Answered
How do I make sure variables aren't overwritten in loops?
I suggest you load up rows in a table. See documentation for the table() function.

6일 ago | 0

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Answered
subtracting images processing,
Try [] to scale your data to your display imshow(c, []);

6일 ago | 0

Answered
Find cell and return index
Your Match is not a pattern in your "a" so that's why it didn't find it. {21 31 1} is nowhere in a. If it still does not work ...

6일 ago | 1

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Answered
How do i convert a bmp or jpeg image to a hexadecimal
See my attached demo. Change %d to %x and it should write out the location and values to a list in a text file.

6일 ago | 0

Answered
Remove strong Noise in signal
Try this: % Get threshold based on first 5 points. It should be bigger than the tallest of those, say by 10% or whatever thre...

6일 ago | 0

Answered
How to randomly divide an M by M region into n sub regions
Try voronoi() if you want random points, or superpixels() if you have an image and want some sort of decision-based boundaries.

6일 ago | 0

Answered
how to align the line detected to the middle of the image
Presumably you know the angle if the line(s) since you plotted them over the grayscale image. So use imrotate() to rotate it, t...

6일 ago | 0

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Answered
How can I use loops to perform different functions on every other array element?
Try this: v = [100;60;70;42;52;31.2;41.2;24.72] nOut = zeros(length(v), 1); % Instantiate column vector for output n. for k =...

6일 ago | 0

Answered
How can I fill boundary by white pixel?
Use poly2mask(), as long as your x and y are in order. It will turn your (x,y) vertex coordinate list into a filled mask (a log...

6일 ago | 1

Answered
i got this error
You appear to have a script called contour.m. This script takes no arguments - that's why it's a script and not a function. Un...

6일 ago | 0

Answered
How do I find a and b in terms of n ?
Just plug x^3 into the upper equation. I think a is 3*2*n = 6n, and b is still 2n.

7일 ago | 2

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Answered
How do I set up a project or solution?
MATLAB now (in R2019a) has “projects” where you can keep collections of files. See Working with Projects For example say I had...

7일 ago | 0

Answered
How can I divide height and width of 4 separate bounding boxes and compare it so that I can extract the object based on certain critera
Since you created the bounding boxes of the objects in the binary image, presumably with regionprops(), you already know their h...

7일 ago | 0

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Answered
Extract color with in region
% Extract your color channels redChannel = rgbImage(:, :, 1); greenChannel = rgbImage(:, :, 2); blueChannel = rgbImage(:, :, ...

7일 ago | 0

Answered
How to make a matrix with negative indexes?
It's explained pretty well in the FAQ: click here

7일 ago | 0

Answered
I have two datasets and I want to put them in one struct
Try s = load('cst1.mat'); data.cst1 = s.cst1; s = load('cst2.mat'); data.cst2 = s.cst2;

8일 ago | 0

Answered
Convert Grayscale image to XYZ file..
See my attached code. It produces a CSV text file with x,y,gray level.

8일 ago | 0

Answered
Linear Regression Through Origin
See a solution: here by Star Strider

8일 ago | 0

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