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Image Analyst


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30,800 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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Contributions in
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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...

9 hours 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...

9 hours 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 ...

16 hours ago | 0

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...

16 hours 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',...

16 hours 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)); % ...

17 hours 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...

17 hours ago | 0

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

17 hours ago | 0

Answered
How to number the peaks and troughs of signal ?
Try findpeaks() in the Signal Processing Toolbox. Invert the signal to find valleys. numPoints = 50; x = sort(rand(1, numPoi...

17 hours ago | 0

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Answered
How to view multiple cells of column data on the same sheet
You can try celldisp() to spit them out to the command window.

18 hours ago | 0

Answered
Is it okay to interpolate between overlapping areas obtained using a sliding window to make a colormap?
The value at that point is the ratio within the window when the window is located at that point. I don't see any problem with t...

18 hours ago | 0

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Answered
Custering data by color
mahdi: Is this what you're looking for: % Initialization steps. Brute force cleanup of everything currently existing to start...

18 hours ago | 1

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Answered
MatLab crashing while saving variable
When it crashed, did it offer to send in the crash log, either when it crashed or when you started MATLAB the next time? If so,...

21 hours ago | 0

Answered
Create a grid on an image
You forgot to attach your image or screenshot. And you forgot to tell us what shaping and flag are. But it looks like this loo...

21 hours ago | 0

Answered
diameter of image (1024x1024 logical value)
You can get the Equivalent Circular Diameter from regionprops(). This is the diameter of the blob if you were to smoosh and mol...

21 hours ago | 0

Answered
Plot a circle of Gaussian varying intensity
I don't see squares, except if you look at 45 degrees, but that's what you get when you use a hex grid. I think you should use ...

1 day ago | 0

Answered
compressing a code, help me
Not sure why it needs to be compressed as much as possible, but this will compress it as much as possible while giving the very ...

1 day ago | 0

Answered
problem with the sum function
You need to leave i as a variable because it did not say to sum over i. So just sum over the j dimension for a given i. Try th...

1 day ago | 0

Answered
Please help to solve this
You got the > sign wrong for the loop. Plus you never updated the temperature in the loop to "temp" - you used Fahrenheit, whic...

1 day ago | 0

Answered
How to Seperate Region of Interest into 3 Segments
If you want equal thirds, just use regionprops() to get the bounding box and then figure out what the columns are to divide it b...

1 day ago | 0

Answered
By tonight I'd like to create an image from RGB data in a file
See my attached demo for scatteredInterpolant(). You could also change it to use griddedInterpolant().

1 day ago | 0

Answered
Creating a porosity map by interpolating between multiple overlapping grid squares
Yes, it's not uncommon. Just call imfilter() or conv2() to sum up the number of white points at each point. You can adjust the...

1 day ago | 0

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Answered
GUI's use
Try this http://blogs.mathworks.com/videos/category/gui-or-guide/ For the first function callback, you can call uigetfile: % ...

2 days ago | 0

Answered
how to read specified letters from ascii file
Try this: % chr = fileread('test1.m') % Whatever file you want to read in. chr = '123456abcdef ABCDEF 789.' % String for test...

2 days ago | 0

Answered
How to delete the ellipse of the previous state
Before you call plot(), call this function: ClearLinesFromAxes(gca); Here is the function: %=================================...

2 days ago | 1

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Answered
obtain answer in brackets
You can use sprintf() to create a string with any appearance you want. Or fprintf() to display it with any appearance you want....

2 days ago | 0

Answered
Color Imaging - RGB channe[
Here's another way to do it using indexing instead of imcrop(): img = imread('image.jpeg'); subplot(1, 2, 1); imshow(img); ...

2 days ago | 0

Answered
Color Imaging - RGB channe[
It worked for me. though you're forgetting to add 1 so they're misaligned vertically. Also you should never use the size fun...

2 days ago | 0

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Answered
Matlab is installed in ubuntu but i am unable to open it
Try clicking the "Error -9" tag on the right hand side of this page. Or else call the Mathworks for fast and free technical su...

2 days ago | 0

Answered
How to display an error if a file doesn't exist
Try this: doy = [30, 200]; days2get = length(doy); ftpObject = ftp('cddis.nasa.gov'); for k = 1 : days2get folder = sprint...

2 days ago | 1

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