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Image Analyst


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32.278 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
legend label for subplots
Can't you just put the legend in one and then users can/will assume the legend applies to all the other 5 plots? Or else put up...

alrededor de 17 horas ago | 0

Answered
Improve speed reading in a .dat file
You could try fileread() to read in the whole file into one variable in one shot, then go through it parsing it.

alrededor de 17 horas ago | 0

Answered
What should I do if the brightness of backgroud is very close to foreground?
They don't look that close. Thresholding should work fairly well. Otherwise use SegNet deep learing if you need to identify tr...

1 día ago | 0

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Answered
How can I rotate an ellipse randomly
See my attached demos. Adapt as needed.

1 día ago | 0

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How to use Xlswrite command in actxserver and how to avoid script gets hanged due to hworkbook.close command?
I don't think you need th close function. Just delete that line and it should shutdown just fine.

2 días ago | 0

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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...

3 días ago | 1

Answered
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...

3 días ago | 1

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; ...

4 días 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 ...

4 días 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...

4 días 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);...

5 días 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...

5 días 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 ...

5 días 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...

5 días 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...

6 días 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...

6 días 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...

6 días 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...

6 días 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 ...

6 días 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 =...

6 días 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...

6 días 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...

6 días 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); ...

6 días 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...

6 días 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...

7 días 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...

8 días 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 ...

8 días 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...

11 días 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().

11 días ago | 1

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

11 días ago | 1

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