Image Analyst

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32,273 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
how to find derivative of a function and ploting the surface of function and its derivative
If you have a 2-D array of numbers, you can use surf() to plot a 3-D rendering of it, or imshow() to display it as an image. If...

17 hours ago | 0

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How to fill the gaps on the boundary surface of the cone using MATLAB?
The code didn't run so I repaired and improved it below. Other than that I don't know anything about it because unfortunately t...

18 hours ago | 0

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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; ...

1 day ago | 0

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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 ...

1 day ago | 0

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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...

1 day ago | 0

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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);...

3 days ago | 0

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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...

3 days ago | 2

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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 ...

3 days ago | 1

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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...

3 days ago | 1

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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 days 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 days ago | 1

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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 days 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 days 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 days ago | 0

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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 days ago | 0

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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 days 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 days 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); ...

4 days 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...

4 days 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...

5 days ago | 0

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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 days ago | 1

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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 ...

6 days 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 days 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 days ago | 1

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

8 days 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.

9 days ago | 0

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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...

9 days 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...

9 days 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...

9 days 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#...

9 days ago | 0