Image Analyst
28 514 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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Contribute at least one answer each month for 36 consecutive months
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Provide your first answer ever to someone else's question
Awarded to Image Analyst on 20 Jul 2017
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...
1 jour ago | 0
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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)
2 jours ago | 0
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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 = ...
2 jours ago | 0
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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 ~=.
2 jours ago | 0
How can I recognize shapes of simple geometrical objects using optimization tools
Attach an image. In the meantime, see my attached shape recognition demo.
2 jours ago | 0
i need to convert a folder of 200 .jpg images to .mat (to create 200 separate .mat files). i know there should be an easy matlab for loop to do this but I need help (newbie). thanks!
See the FAQ for code samples.
2 jours ago | 0
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...
2 jours ago | 0
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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...
2 jours ago | 0
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...
2 jours ago | 0
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...
3 jours ago | 0
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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.
3 jours ago | 0
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subtracting images processing,
Try [] to scale your data to your display imshow(c, []);
3 jours ago | 0
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 ...
3 jours ago | 1
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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.
3 jours ago | 0
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...
3 jours ago | 0
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.
3 jours ago | 0
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...
3 jours ago | 0
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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 =...
3 jours ago | 0
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...
3 jours ago | 1
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...
4 jours ago | 0
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.
4 jours ago | 2
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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...
4 jours ago | 0
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...
4 jours ago | 0
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Extract color with in region
% Extract your color channels redChannel = rgbImage(:, :, 1); greenChannel = rgbImage(:, :, 2); blueChannel = rgbImage(:, :, ...
5 jours ago | 0
How to make a matrix with negative indexes?
It's explained pretty well in the FAQ: click here
5 jours ago | 0
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;
6 jours ago | 0
Convert Grayscale image to XYZ file..
See my attached code. It produces a CSV text file with x,y,gray level.
6 jours ago | 0
How to stitch two sets of multiple images together into a panorama and make them be the same size
I'd maybe try to fill the black parts with the mean gray level, then use imregister() to align them. I don't think they need to...
6 jours ago | 0
Computing water level based on difference in frame colors
I would convert from RGB to HSV, then take the S channel. I'd then take the mean along rows (direction 2), then take the locati...
6 jours ago | 1