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Image Analyst


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30,561 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
How to loop around cumsum ?
Did you just want the sum of each column? Like this: columnSums = sum(Flux, 1);

6 hours ago | 0

Answered
not enough input argument error
If your function is called MyFunc() and it expects two variables, a 1x128 double vector and a single character, then you need to...

7 hours ago | 0

Answered
How can I obtain my expected result?
fprintf() returns the number of characters printed, which is not what you want. What you want is this: function out = picker(c...

1 day ago | 1

Answered
Blending interpolation for a function
Try this: % I need to calculate the value f(x,y)=sin((pi/2)*(x+y)) % for the function using the blending interpolation reffe...

1 day ago | 1

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Answered
How do I Convert Cells containing Binary Values into Cells of Decimal Values and Decimal Values into Strings?
Try this: % Create sample data. A = zeros(5, 1000); A(randperm(numel(A), 200)) = nan; A(randperm(numel(A), 800)) = 1; [rows...

1 day ago | 0

Answered
Nonlinear curve fitting of multiple peaks
See my attached demo that can fit any number of Gaussians to some data. Adapt the formula from Gaussian to your special formula...

1 day ago | 0

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Fitting data with different type regression
mohammadreza: you can do a piecewise linear fit. What I did was to fit two lines. I picked a dividing line between the two set...

1 day ago | 0

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Trouble formating strings with fprintf.
Try putting \t before every %20s, or else add spaces to the end of every day to make it as long as Wednesday.

1 day ago | 0

Answered
creating sliding windows for own purpose(do not want to calculate std or mean or any of that stuff)
There is a function that does this in the Image Processing Toolbox. It is called blockproc(). You can define your overlap (if ...

2 days ago | 0

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Answered
How to find the middle 25% of an array?
Try this X = length(yourVector) index1 = round(vecLength * (0.5 - 0.25/2)) index2 = round(vecLength * (0.5 + 0.25/2)) Y = X(...

2 days ago | 0

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Answered
Stitching image in 2 direction
If you don't want to butt the images against each other but there is some overlap that needs to be determined, then you will nee...

2 days ago | 0

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Answered
How can I calculate the standard deviation for a part of "all data"?
I have no idea what "a" is. But is this something like you were looking for? timeVec = [0,0.5,2,4,6] % Don't use "time" since ...

2 days ago | 0

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Answered
Counting Total Number of Pixels by Color in a Segmented Image
Code is in the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F In the for loop over all image ...

2 days ago | 0

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Answered
Outline the shape in the image
You can use bwboundaries() and plot(): binaryImage = 0.6 < grayImage & grayImage < 1; boundaries = bwboundaries(binaryImage);...

2 days ago | 0

Answered
example about smaller than
Hint: Check out diff() and sum().

2 days ago | 0

Answered
positive and negative deflection
mean is a built-in function. It requires an argument, like mean(RF). Then it should work. mu = mean(RF); standarDeviation = ...

2 days ago | 0

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Answered
Plot each image on the same figure. Use enough time increments so that the period of the largest frequency of oscillation has about 40 time increments per period
For the same figure, different axes, use subplot subplot(2, 3, 1); plot(t, y1); subplot(2, 3, 2); plot(t, y2); subplot(2, 3...

2 days ago | 0

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image processing problem in Salt and Pepper noise
A better method is to use a modified median filter where you only replace the noise pixels with the median, not ALL pixels. Thi...

2 days ago | 0

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Stitching image in 2 direction
To stitch images: wideImage = [image1, image2]; % Must have same number of rows. tallImage = [image1; image2]; % Must have sam...

2 days ago | 0

Answered
Spikes at the start of audio recording
I'd do it in the time domain. I'd just crop it out, as long as it doesn't overlap any good signal. Just find the first negativ...

2 days ago | 0

Answered
RMS image process for multiple photographs
What is the RMS result and RMS code? What does dichotomize mean? You mean binarize or threshold??? What I'd do is, if you wan...

2 days ago | 0

Answered
color transform to lab then to rgb
Try this: rgbImage = imread('peppers.png'); labImage = rgb2lab(rgbImage); lImage = labImage(:, :, 1); aImage = labImage(:, :...

2 days ago | 0

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Answered
Fill area between plot and the 0-line?
For a more general situation, see the FAQ: https://matlab.fandom.com/wiki/FAQ#How_do_I_shade_the_region_between_two_curves.3F

2 days ago | 0

Answered
Determine the true length of the object - image analysis
Try bwskel() and then, if it's too short, find the two points farthest way from each other and extend the endpoints of the skel...

2 days ago | 0

Answered
convolution of a function
See attached demo, where I do the filtering both in the spatial domain and the Fourier domain. You can adapt it to 1-D signals ...

2 days ago | 0

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Modifying the NDVI Values Using Multispectral Images
Try this: maxValue = max(NDVI(:)) minValue = min(NDVI(:)) binaryImage = NDVI > 0.3; You might also be interested in my inter...

2 days ago | 0

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Answered
What is problem to make space curve [2*cos(t),2*sin(t),5]?
Not sure what the 5 is for, but maybe you mean this, using plot3() to plot a 3-D curve: t = 0 : pi/10 : pi; plot3(t, 2*cos(t),...

3 days ago | 0

Answered
image processing sinusoidal periodic noise
See attached demo.

3 days ago | 0

Answered
How to find the neighboring maxima in an image
Why not simply use imregionalmax()?

3 days ago | 0

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Answered
Read and process multiple images
Code samples in the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

3 days ago | 0

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