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Image Analyst


28,795 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

Image Analyst's Badges

  • 36 Month Streak
  • Most Accepted 2014
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  • Grand Master
  • Revival Level 4
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Answered
Attempted to access Tr(4); index out of bounds because numel(Tr)=3
It's hard to decypher this uncommented alphabet soup (without spending a lot more time), but all we know for sure is that the lo...

12 hours ago | 0

Answered
Write a function called blur that blurs the input image. The function is to be called like this:
You never assign blurimg to B, so B remains the input image that you assigned it to way up at the top.

1 day ago | 0

Answered
How can make a vector from a structure?
T(100).xi already IS a vector. You can simply use it as x: plot(T(100).xi, T(100).yi, 'b-'); grid on; Or you can take all of...

3 days ago | 0

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Answered
How to find x and y value of top corner of the image
See my attached Optical Mark detection demo.

4 days ago | 0

Answered
How to select images from nested folder?
Have you looked at imageDatastore()? Or dir() using two asterisks as the file pattern?

4 days ago | 0

Answered
How to find the area of a segmented image in matlab?
You need to invert your image so that your black region of interest is white. Then call sum() to get the number of pixels: num...

4 days ago | 2

Answered
Image Segmenter app - Manual Threshold - how is calculated?
The threshold while using the "Manual Threshold" option is set by you moving the slider. If it makes a guess at the threshold to...

4 days ago | 0

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Answered
getting coordinates from a picture
Well, you could use image analysis: clc; % Clear the command window. close all; % Close all figures (except those of imtoo...

5 days ago | 1

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Answered
How to use the sum command to get both the sum and output in the same array
Try this: clc % How to get the 4th col to have summation of cols 1:3? %% Input % Array initalization samp(10,4) = zeros % ...

7 days ago | 0

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Answered
how to define the location of points within a shape that is invariant to shape transformation?
There are lots of points inside the triangle that are still inside it after you transform the triangle's shape and location. ...

7 days ago | 0

Answered
关于安装方法的选择
Call tech support for all installation questions.

7 days ago | 0

Answered
Measuring distance of an object using 2 stereo vision cameras
Do you have the Computer Vision Sytem Toolbox? If so, use the camera calibration functionality. See the links on the right han...

7 days ago | 0

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Answered
area of many cracks in image
What I'd do is: Take a photo of a completely uniform white sheet to get a background that you can use for lens shading correcti...

7 days ago | 0

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Answered
hiding text inside image
See attached demos. Adapt as needed.

8 days ago | 0

Answered
How to find the median filtered image after doing subtracting averaged image from original image
filteredImage = medfilt2(differenceImage, [7, 7]); Adapt as needed. I've never heard of or used the fibermetric() function.

8 days ago | 0

Answered
How can data gradually be exported to an Excel file?
You could just read in the existing worksheet and find out the last row: if isfile(filename) % Read in existing file to ge...

8 days ago | 0

Answered
Gaussian noise on dicom images
Try changing the input parameters for imnoise() so that it adds less noise. Attach your image if you need more help.

8 days ago | 0

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how to add jpeg toolbox?
The answer is in the link you posted: If you find this software useful, or if you would like to contribute to the proj...

8 days ago | 0

Answered
Why does the image after subtracting the original image from average image displays a black screen
Some or all of your values may be small (too dark to see) or would be negative (and so they will be clipped to zero if you have ...

8 days ago | 1

Answered
How to fit ellipse equation through segment of ellipse?
Have you tried the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_fit_an_ellipse_or_other_shape_to_a_set_of_XY_data.3F

8 days ago | 1

Answered
extract each ten values
Try a loop to get the contents of the cells in your cell array, then extract 10 elements and move back towards the beginning of ...

8 days ago | 2

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Answered
How to transform a unit8 variable into a double one?
doubleVar = double(uintVar); Replace with your actual variable names, of course.

8 days ago | 0

Answered
How can I solve this problem?
You chose a threshold where there were no blobs. Pick a threshold where you actually have some blobs present. But you can't be...

8 days ago | 1

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Answered
MATLAB Answers Wish-list #5 (and bug reports)
In Firefox v67, if you click on the m-file attached to a question, it offers to open it in MATLAB. But if I say to open it in M...

8 days ago | 0

Answered
I need to create a cell array initializing each element in it to 3*1 null matrix.
I don't know about null. How about nan? for k = 1 : numel(F) F(k) = {nan(3, 1)}; end

8 days ago | 0

Answered
How can I extract/detect, separate the wall from the window using vertical and horizontal line detection?
Try edge() and imfill(). Is it your assignment?

8 days ago | 0

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Answered
For loop, Subscript indices must either be real positive integers or logicals ?
See the FAQ https://matlab.fandom.com/wiki/FAQ#How_do_I_fix_the_error_.22Subscript_indices_must_either_be_real_positive_integers...

8 days ago | 0

Answered
How to get edge line of from binary Image?
I suggest you improve your segmentation algorithm first. After that it will be so much easier to get the outlines with bwbounda...

8 days ago | 0

Answered
How to Randomly scatter and show that location in table
Try rand().

8 days ago | 0

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