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Image Analyst


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30.822 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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Answered
I find there is some problem with the importdata function import data, there is some data without negative character?What is the reason?
I don't know. I think maybe all the minus signs in the string on each line might be confusing it. Try readmatrix: data = read...

alrededor de 3 horas ago | 0

Answered
How to code image types?
Try this: grayImage = imread(fullFileName); % Get the dimensions of the image. % numberOfColorChannels should be = 1 for a gr...

alrededor de 3 horas ago | 1

| accepted

Answered
How do I pre-allocate a struct in a while loop with unknown N?
You could preallocate a huge amount -- way more than you think you'd need -- then just use indexing after the loop to crop it to...

alrededor de 3 horas ago | 0

Answered
Can anyone help me understand this code?
This crude code reads in images and resizes and displays them. It also (for some reason) stores them in a cell array.

alrededor de 3 horas ago | 0

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Answered
what is the meaning of this code?
It just instantiates four cell arrays and a double matrix. It doesn't really mean anything, at least not to me. Why should it?...

alrededor de 4 horas ago | 0

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Answered
How to divide a closed detected edge of an image into 8 parts from a point inside in it..?
See the FAQ: https://matlab.fandom.com/wiki/FAQ#How_do_I_create_an_arc.3F Adapt as needed.

alrededor de 4 horas ago | 0

Answered
Fixed sized positionable rectangular ROI
Try drawrectangle(). Use can click and drag. Set up a listener that resets the size in the event that they click a handle to c...

alrededor de 4 horas ago | 0

Answered
How to disable a toolbox
To disable an entire toolbox -- ALL of it's functions -- you can uninstall it from the Add-On Manager (Home tab of Toolbar -> Ad...

alrededor de 5 horas ago | 0

Answered
How to save the hold on image
Try exportgraphics() if you have R2020a. Otherwise use export_fig().

alrededor de 5 horas ago | 0

Answered
image differences in a series
See the FAQ for code samples: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

alrededor de 5 horas ago | 1

Answered
how to delete a row in a cell array
Since your question is ambiguous, I've done it for you both ways: A = {'rowcount' 'one' 'two' 'three'; 'rowone' [1] [2] [3]; 'r...

alrededor de 22 horas ago | 0

Answered
Is that possible to view the codes of standalone application?
No, noone can read them. It's a binary file. Just like no one can see the source for for Microsoft Word by editing the .exe fi...

alrededor de 23 horas ago | 1

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Answered
Create custom x-axis for 'imagesc' plot
If you use imshow(), you can simply pass in the endpoints of the x axis to the 'XData' property: imshow('moon.tif', 'XData', [-...

alrededor de 23 horas ago | 0

Answered
adding variablenames to multiple columns in cell2table
It is not possible. You'll have to leave it as a cell array. For a table, all columns must have a unique variable name. With ...

alrededor de 23 horas ago | 0

Answered
Does anyone know how to use the matlab to calculate the minimu distance between a point outside oval and the oval surface?
"The oual can be both given in the form of an equation or data points." <== if you have data points (xb, yb) on the boundary o...

1 día ago | 0

Answered
How to read a multiframe tiff in MATLAB?
This is what I do in my app having multipage tiffs info = imfinfo(imageFullFileName); numberOfPages = length(info); for k = 1...

1 día ago | 0

Answered
How to detect the uitable on GUI
You can use isempty() to determine if a variable is null. You can use iscell() to determine if a variable is a cell array. The...

1 día ago | 0

Answered
adding 5% white gaussian noise
Try this: % Make sample data. x = linspace(0, 3*pi, 640); period = 2*pi; y = cos(2 * pi * x / period); % Noise-free signal. ...

1 día ago | 0

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Answered
How to plot images with different sizes in one figure?
The first argument to subplot needs to be 2 because there are 2 rows. The layout is this: 1 2 3 4 For the first two plots,...

1 día ago | 0

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Answered
fitting a circle with fitnlm
You might also be interested in the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_fit_a_circle_to_a_set_of_XY_data.3F

1 día ago | 0

Answered
How to plot (n) circles with known center and radius
If you have the Image Processing Toolbox, use viscircles(centers, radii): theta=10 % azimuthal distance between the centers of ...

1 día ago | 0

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Answered
how to create a video after an edge detection for loop
You're not writing the edge image out, either to a saved image file or the video. See my attached demos -- they show you how to...

1 día ago | 1

Answered
Why is my code showing the error:" Error using matlab.graphics.primitive.Image/set; Invalid or deleted object.
At some point hShow disappears. Set a breakpoint there and then stip through with the debugger and look at the workspace to fin...

2 días ago | 0

Answered
How to select the desired object in a certain region in an image?
Just check the area and centroid and throw out those that aren't close enough to the middle and large enough labeledImage = bwl...

2 días ago | 0

Answered
What is wrong with my code ,why i am getting exactly same output and plot for spline and cubic?
A spline is a cubic interpolation between points with the added requirement that the slopes match at the knot points. Not sure ...

2 días ago | 0

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Answered
Display output in the center of the screen
I don't know because the command window width changes depending on how you have it sized. This might be a question for Yair Alt...

2 días ago | 0

Answered
Avoid lower case in legend by plotting legend with 'DisplayName'
Use the 'Interpreter', 'none' option in legend(): % Read headers plot(1:10); hold on plot(4:14); legend('plot_1', 'plot_2',...

2 días ago | 0

Answered
displacing iterations of a signal
In your loop, you can just create an x that gets shifted on each iteration stim = ...... x = 5000 * i + (1 : length(stim)); % ...

2 días ago | 0

Answered
How to curve fit an edge on an image
There is no point in doing a Canny edge detection after you have binarized the image. Just binarize and scan your image from to...

2 días ago | 0

Answered
How can I save UIAxes as an image when button is pushed in app designer?
Try exportgraphics().

2 días ago | 0

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