Image Analyst

Last seen: Today

32.139 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
change the dimension of a cell in a cell array
You almost definitely should not use a cell array for this. They are slow and have lots of overhead. It looks like you can use...

22 minuti ago | 0

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Remove duplicate 1s from matrix columns
Mitchell, try this: qq = logical([... 1 0 1 1 1 1 1 0 1 1 1 0 0 0 1]) [rows, columns] = si...

1 giorno ago | 0

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Generating a range of curves that fit inside a set of fixed limits
Here's an example. Adapt as needed: clc; % Clear the command window. close all; % Close all figures (except those of imto...

2 giorni ago | 0

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Subtracting XYZ coordinates defined by matrices
"For instance let A correspond to the point cloud corresponding to a sphere and B correspond to a smaller, concentric sphere. Th...

3 giorni ago | 1

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Is it possible to tell what matlab is "Busy" with?
You might be able to click the pause button and it will stop there, then hopefully if you click continue, it will continue.

3 giorni ago | 1

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Answered
How can I find the max value and location within a matrix
Try this, where m is your matrix maxValue = max(m(:)); rows = find(m == maxValue); % Find all locations where m equals the max...

3 giorni ago | 1

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Answered
Writing the built in matlab function in simple code(like for loop, etc.)
Jimmy, try this: y=[1 2 3 4]; % First input OccurancesParameter= 5; % second input , it's always unsigned integer number great...

3 giorni ago | 0

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Manipulate amplitude without using linspace
Use rescale(): x_t = rescale(x_t, -2, 1);

3 giorni ago | 1

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Automatic Segmentation of Ultrasound Images?
It's so noisy and ill-defined that I see deep learning using SegNet as your only hope. Otherwise look to the literature: USC A...

3 giorni ago | 0

Answered
How to detect small white pixels in an image and change their colour
You can use regionfill(), or you can treat them as salt and pepper noise and use my attached demo which uses a modified median f...

3 giorni ago | 0

Answered
time stamp in video files (image to video file conversion)
If you have the Computer Vision Toolbox, use insertText(). If not, you have to use text() and then getframe() but the image s...

3 giorni ago | 0

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Answered
draw horizontal lines on edges of a image
Try this: clc; % Clear the command window. close all; % Close all figures (except those of imtool.) clear; % Erase all e...

3 giorni ago | 0

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Find the Euclidean distance of each pixel from a user-selected pixel in color space and displays scaled images from 0 to the current max distance.
Just do this [x, y] = ginput(1); row = round(y); col = round(x); rp = double(rgbImage(row, col, 1)); gp = double(rgbImage(r...

3 giorni ago | 0

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Answered
how to convert dicom image to png
I imagine you looked at what map was. Did that not give you any clue as to why it was not 3 columns? What was it? Maybe it's ...

3 giorni ago | 0

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Answered
Purple colour extraction only
Ramdhan: OK, here is a full demo: % Demo by Image Analyst. clc; % Clear the command window. close all; % Close all figur...

3 giorni ago | 0

Answered
How to automatically obtain upper-left pixel coordinates of one of the 4x4 blocks I obtained splitting an image?
Try indexing: [rows, columns] = size(ca) for col = 1 : columns for row = 1 : rows thisCellContents = ca{row, col...

3 giorni ago | 0

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Answered
How to extract highest intensity area from a greyscale spectrogram?
You've given no criteria for how those areas are to be determined. You might want to use watershed() or superpixels(). Or use ...

3 giorni ago | 1

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Answered
Finding longest subvector of equal elements in 5000000 length int-vector.
Here's how I thought of to do it, using regionprops to count the length of each consequtive run of numbers: data = [1,1,1,2,1,1...

4 giorni ago | 0

Answered
Change font and fontsize in uialert of title and message text?
See attached demos.

4 giorni ago | 0

Answered
how to calculate area region growing
You accepted an answer, so is it solved already? If not, what is this regiongrowing() function you mentioned? You should just ...

4 giorni ago | 1

Answered
finding the radii of circles knowing the center of those circles
You can do this: mask = grayImage > 50; % Or whatever props = regionprops(mask, 'Centroid', 'EquivDiameter', 'Area'); allDiam...

4 giorni ago | 1

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Answered
Purple colour extraction only
Try this: mask = imdilate(redChannel>200, true(5)); %the mask

6 giorni ago | 0

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Display Folder Browser in MatLab Online?
Try issuing the >> filebrowser command.

6 giorni ago | 0

Answered
setting the limits for negative values for colormap
What are the values when it crashes: minValue = min(C{g,1}(:,1)) maxValue = max(C{g,1}(:,1)) fprintf('Min = %f, max = %f.\n'...

6 giorni ago | 0

Answered
Saving full screen multiple figures
Try this: clear all; close all; clc; format long g; format compact; fontSize = 18; fprintf('Beginning to run %s.m ...\n',...

6 giorni ago | 1

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Answered
How to compare two colors?
JD, I haven't heard back from you so I assume you're having a lot of trouble. Maybe start with this simple script where I compa...

6 giorni ago | 0

Answered
How to compare two colors?
There are several ways to do this. For example you can use statistical discriminant analysis in RGB color space, like the attac...

6 giorni ago | 0

Answered
Finding the trajectory of a projectile
Attached is a program my son and I did for his college physics course. It computes just about everything you could possibly wan...

6 giorni ago | 1

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Answered
How to plot a graph with a for loop
You need to define x with linspace() and then use hold on in the loop: x = linspace(0, pi/4, 500); for n = 0 : 10 S = cos(n*...

6 giorni ago | 0

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Answered
Please, How do I determine the Mean Absolute Value (MAV) of an acoustic signal, which has positive and negative data points?
Not sure what you mean by "Mean Average Signal" - that's kind of redundant isn't it. Mean and Average mean the same thing. Wha...

7 giorni ago | 0