Image Analyst

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32.865 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
使用的学生版本matlab,但是之前激活的电脑坏了准备换一台新电脑,这个matlab是否还可以继续使用?还是说需要我先停止原先电脑上的matlab然后在新电脑上重新激活一遍?
You can, but you with a Student license you can have only one activated at a time, so you need to deactivate the computer you're...

circa 4 ore ago | 0

Answered
Is there a method to use ‘findpeaks’ to detect bright spots in an otherwise darkimage?
Show/attach/post your original gray scale image. My guess is that you can threshold to find the bright blobs, then find the cen...

circa 22 ore ago | 0

Answered
How to split into small pieces of ranges of this graph?
If you simply want to zoom in and look at a narrower viewport window, you can set the left and right ends of the x axis with the...

2 giorni ago | 0

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How to plot 3D heat map in Matlab
There is not much heat to plot in that small data set. You might just visualize it with plot3() and make the markers somewhat l...

2 giorni ago | 0

| accepted

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From plot to video
See attached demo and adapt as needed.

2 giorni ago | 0

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Extract email information from webpages/URLs using Matlab
Looks like L is a cell array of web sites, none of which is an email address with @ in it. So why do you think it should find a...

2 giorni ago | 0

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Answered
How to find an unclear edge?
Try to denoise your image first. You might try imnlmfit() or a mean shift filter or something like that.

2 giorni ago | 0

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I need help with pixel neighborhood operations
Looks like you've accepted an answer that works (via intensity thresholding) for the image you uploaded. If you want a more rob...

2 giorni ago | 1

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Subroutine using if statement
Lots of stuff wrong with this. For starters, you're passing in the whole x vector into the (poorly-named) X function yet your f...

2 giorni ago | 0

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want to display the x value of the maximum in my graph?
Try this: x=[1 2 3 4 5 6]; y=[5 6 7 6 5 4]; [highest,index] = max(y) plot(x,y); text(x(index), y(index), '\leftarrow') ylim...

2 giorni ago | 1

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Answered
color space plot of image
I believe you're wanting the colorcloud() function. It plots the gamut in 3-D. Not sure what a 2-D plot would be. What do the...

3 giorni ago | 1

Answered
What this error 'Dimensions of arrays being concatenated are not consistent' means?
It's thoroughly discussed in the FAQ: https://matlab.fandom.com/wiki/FAQ#.E2.80.9CDimensions_of_arrays_being_concatenated_are_n...

3 giorni ago | 0

Answered
How to read pixel labels in pixellabel datastore.
Duplicate of question already asked and answered: https://www.mathworks.com/matlabcentral/answers/850850-the-assigned-pixel-nam...

3 giorni ago | 0

Answered
How can i plot three periods of a signal
Try it this way: % t=[0:0.0002:20]; % xc1=cos(2*pi*493.88*t); % argument in cos = 2*pi*t/period. So period = 1/493.88 thre...

3 giorni ago | 0

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Answered
Unable to do subtraction of images in GUI
What is this???? InputImage2 = imresize(InputImage2(value1), [rowsInputImage1 colsInputImage1]); You're saying the image is In...

3 giorni ago | 0

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Answered
Does anyone know how to improve this code?
Lots of ways. For starters: Use descriptive variable names. Like not sz but [rows, columns, numberOfColorChannels] = size(rgb...

3 giorni ago | 0

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Answered
How do i get the sound of a cosine signal
Scott is right on. For what it's worth, I'm attaching my demo for making a warbling, decaying chirp sound:

3 giorni ago | 0

Answered
Eliminate rows from an array
To eliminate the "second half of rows" (like you asked) from your column vector, do this: midRow = ceil(length(data3) / 2); da...

3 giorni ago | 1

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Answered
What changes should I make to get binary images correctly in order for BoundingBox to grab the ROI correctly?
This seems to work for all the images you attached. % Demo by Image Analyst clc; % Clear the command window. close all; %...

3 giorni ago | 1

| accepted

Answered
Why is my workspace empty after running a script?
Something is not right with what you've shown. You have a semicolon after the "a=1" so that means when you type Untitled into t...

3 giorni ago | 1

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How to eliminate unwanted objects from droplet image to ease droplet identification/sizing and strange imcrop behaviour
First you need to flatten the background. One of the best ways is to take a blank shot with no sample in there to get an image ...

3 giorni ago | 0

Answered
How to retrieve data points from a grayscale histogram?
Try this: grayImage = imread('cameraman.tif'); % Read in image. counts = imhist(grayImage) % Take histogram grayLevels = 0 : ...

3 giorni ago | 0

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Answered
intensity of dought events
You need to use regionprops(), which will get you both the length of each drought, as well as it's mean value. You can also get...

3 giorni ago | 0

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How to set which part of the code to comment using a variable?
Once you've got that figured out then, to COMPARE the algorithms, you might want to look into an ROC analysis using the MATLAB f...

3 giorni ago | 0

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How to make segmented regression line and determine the breakpoints?
The way I do it is to pick a dividing point and then slide that along fitting a line to each side. The dividing point that has ...

3 giorni ago | 0

Answered
My pictures have a format of [227 227 1] so I had the idea to triplicate my processed pictures and put them back into one to get a format of [227 227 3], how can I do this?
Here is the way I usually use rgbImage = cat(3, grayImage, grayImage, grayImage);

3 giorni ago | 1

Answered
Zooming a portion of figure in a figure.
See attached zooming demo.

4 giorni ago | 0

Answered
How to do OR operation of two images (DFT and Binary)?
To me this looks like a series of 3 tiles butted together. And you want to find the thin crack that's vertical in the middle ti...

4 giorni ago | 1

Answered
"Array indices must be positive integers or logical values" for i=2 in loop
The error is thoroughly explained in the FAQ: https://matlab.fandom.com/wiki/FAQ#.22Subscript_indices_must_either_be_real_posit...

4 giorni ago | 0

Answered
How to check the existence of a variable inside handles?
Instead of delete(handles.obj.pc(index)); try handles.obj.pc(index) = [];

4 giorni ago | 0