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Image Analyst


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32 271 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

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Answered
Plotting complicated function with asymptotes
Did you try y = linspace(7, 12, 1000); signal = exp(y .* cot(y)) .* sin(y); plot(y, signal, 'b-', 'LineWidth', 2); grid on; ...

ungefär 18 timmar ago | 0

Answered
Programmatically crop rough image to rectangle
There is no function to find the largest interior rectangle for arbitraily shaped blobs. You can try scanning down with a line ...

ungefär 22 timmar ago | 0

Answered
How to center and add margin around image?
Have you tried padarray()? Then use indexing to paste it onto the other image. I'm attaching a copying and pasting demo. Chec...

ungefär 22 timmar ago | 0

Answered
How plot to matrices in 3D
Some possible options: x=1:5; y=3:5; [X, Y] = meshgrid(x, y) z = [-1 2 3; -5 -1 3; -2 4 8; 1 3 7; 4 7 10] subplot(2, 1, 1);...

2 dagar ago | 0

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Answered
How to recognize negative numbers with OCR?
Can't you simply add a - to the CharacterSet? Then if the first character is a -, it's a negative number. This works fine: gr...

2 dagar ago | 2

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Answered
Add a Title for Each Group of Subplots in a Figure Window
I believe you can use text(). I think it will place text on the figure if you tell it to, instead of the current axes. Try it ...

2 dagar ago | 1

Answered
Monte Carlo noise simulation
You can use rand() to get a 1000 row matrix with 2 columns. Then use mean() and std() on each column or row. I'm attaching som...

2 dagar ago | 1

Answered
Logical with complex numbers in a vector
Perhaps this: complexVector =[ 0.0000 + 0.1000i 1.7321 + 0.0010i 3.0000 + 0.0000i] % Define a tolerance: toleranc...

3 dagar ago | 1

Answered
Error in splitapply command
This seems to work fine: B = 1 + 9 * rand(1, 100000); edges = 1 : 0.5 : 10 [counts, edges, bin] = histcounts(B, edges); % bi...

3 dagar ago | 1

Answered
Deep learning or Machine learning for the image processing is better option?
It depends on the images. Like, how easy it is to segment with traditional methods versus how ill-defined or variable the objec...

3 dagar ago | 1

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Answered
How to get mode values of RGB to represent one image
Explain exactly what "extract RGB from those images" means to you. Because to get the individual color channels (R, G, and B) f...

3 dagar ago | 0

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Answered
Find distance between one point and a subset of other points.
For example, with 2-D array X, and 4 points: n = 4; % Whatever X = rand(n, 2); % Find distance between point 1 and all other ...

3 dagar ago | 0

Answered
How can I get randperm to return a permutation of a vector that has no entries at their original positions?
Just keep looping until there are no matches, like this: n = 5; originalVector = 1 : n; maxIterations = 10000; loopCounter =...

3 dagar ago | 0

Answered
How can I improve segmentation of these images?
Did you try the Color Thresholder on the Apps tab of the tool ribbon? Set it up for hsv color space and tell it to find green b...

3 dagar ago | 0

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Answered
is their any way to calculate automatically this parameter from the image ?
Of course it's possible. Try this. Adapt as needed: % Demo by Image Analyst, February, 2021. clc; % Clear the command win...

3 dagar ago | 1

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Answered
How do add one picture onto another picture in MATLAB?
subplot is one way subplot(2, 2, 1); imshow(image1); subplot(2, 2, 2); imshow(image2); subplot(2, 2, 3); imshow(image3); ...

3 dagar ago | 0

Answered
Best practise for quickly changing parameters of a function?
Try this: functionValues = [0.38, 800, 32; 0.5, 700, 64; 0.4, 750, 16] % Whatever values you want % Loop through all...

3 dagar ago | 0

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Answered
Matlab programmer for writing a code
Absolutely there is. Mathworks would be delighted to write your code for you. Visit this link to get started: https://www.mat...

4 dagar ago | 0

Answered
Radious of curvature calculation from dicreate data set ?
Fit the data to an exponential decay. That should give you better parameters to use than the radius of curvature. I think this...

5 dagar ago | 1

Answered
How to find total number of pixels in a colour image? How to find the resolution of an 2D image?
[rows, columns, numColorChannels] = size(rgbImage); numberOfPixels = rows * columns; Digital resolution is number of rows and ...

5 dagar ago | 1

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Answered
How to find the distance between two points on an image using edge detection
If the distance is wrong, then the spatial calibration factor of 0.02645 cm per pixel is not correct. And obviously the spatial...

8 dagar ago | 2

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Answered
Getting unique information from .CSV, group and average
I didn't look at the data, but you might want to look at splitapply() and findgroups().

8 dagar ago | 1

Answered
How do you perform moving average with given data?
Try readmatrix() data = readmatrix(filename); data(isnan(data)) = [];

8 dagar ago | 1

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Answered
Local binary pattern varient
I didn't delve into your code but if you want to see how I did it, see my attached demo.

8 dagar ago | 0

Answered
How to plot for this code?
Since youi're calline fft2(), you're dealing with images not 1-D signals. So call imshow() instead of plot(), unless you want t...

8 dagar ago | 0

Answered
Linear Regression problem issues
Can you simply use polyfit(x, y, 1)? Or do you have to use the slash operator? And obviously you need more than 1 point if you...

8 dagar ago | 0

Answered
PROBLEM ANIMATING SURF PLOT
Not sure what your definition of "move" is. Are you talking about an animation? Or do you just want there to be variation alon...

8 dagar ago | 0

Answered
drowsy detection using CNN
My answer was given in your duplicate question: https://www.mathworks.com/matlabcentral/answers/124792-how-to-detect-drowsiness#...

8 dagar ago | 0

Answered
Preprocessing step for a set of images taken under different illuminations.
You need to have something in your image that is the same from photo to photo, like an X-rite Color Checker chart or some other ...

8 dagar ago | 0

Answered
get eccentricity and metric values images
Index your variables with k: area(k) = cat(1,stats.Area); eccentricity(k) = cat(1,stats.Eccentricity); metric(k) ...

8 dagar ago | 0

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