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# Image Analyst

25,193 total contributions since 2010

Senior Scientist 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. 37+ 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
Compute Histogram of an image using loops
Here's a hint. As you said, you need a loop (one or two depending on how you do it) So you'll have something like this for the...

18 hours ago | 0

Answered
Color-based object recognition
See my File Exchange for color segmention algorithms <http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862...

21 hours ago | 0

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i have divided the image into blocks now, i want to access each block individually and i compute histogram how do i access each block
You have the block so just pass it into histogram() h = histogram(Block(:,:,k+j));

23 hours ago | 0

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Finding an equally spread subselection of XY-points
Try this: % Make 100 randomly located points between 0 and 100 x = 100 * rand(1, 100); y = ones(1, length(x)); sub...

23 hours ago | 0

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Can anyone say how to divide an image in 6 parts?
FAQ: <http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F>

24 hours ago | 0

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How to resize many images and putting them back in a folder for using them in "image category classification"?
It sounds like the utility resizes the images but does not name them correctly, if that's what you mean by "labelled". You can ...

1 day ago | 0

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how can i vectorize this loop?
Well you could try meshgrid() but I think it might make it a little more confusing to understand what it's doing. With only 100...

2 days ago | 1

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How to do a 2D convolution result with the log operator for an Image.
That has nothing to do with log. That's a standard Laplacian high boost filter. Here, try this: grayImage = imread('peppe...

2 days ago | 1

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help image processing code
Set up your scroll bar to have 135 as the max and 1 as the min. Then in the scrollbar callback function: scrollBarValue = ...

2 days ago | 0

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How can I modify this code below to generate random points inside a regular hexagon and then get the points in a vector?
Instead of generating _randomly located vertices_, you need to put vertices for your hexagon. I assume you know how to do this....

2 days ago | 0

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How to remove AWGN noise from Electric Field Signals
How about smoothing it with medfilt1(), conv(), or sgolayfilt()?

2 days ago | 0

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IY component is the normalized version of the original intensity channel and how to segment it using the bi-level thresholding method for doing background seperation
Try imbinarize(). If that doesn't work, then attach your image. Usually when people want image processing advice, they attach ...

2 days ago | 0

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Automatic Signal segmentation for feature extraction
Attach some signals so we can play with them. Assuming the "tall" parts of the signal are not uniformly spaced (in which ca...

2 days ago | 0

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Analysis of Surface Roughness
You can use functions like sqrt(), mean(), etc. Most of the formulas are pretty simple.

2 days ago | 0

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How to find average?
Maybe say avgpayoff(i) = sumpayoff/numflips % Get payoff for this iteration. Then after the loop do meanPayOff = me...

3 days ago | 0

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why do i get error when using *?
Try this: f = x .^ 2 .* exp(x) + x .* (x + log10(x)) .^ (1/2)

3 days ago | 0

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Same software - new computer
Call the Mathworks tech support on Monday. They will walk you through it. We can't really help. <http://matlab.wikia.com/wi...

3 days ago | 0

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How to remove irregular shaped cells in this image?
OK, here, try this, adjusting thresholding parameters as needed. clc; % Clear the command window. close all; % C...

3 days ago | 0

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Answered
How to remove irregular shaped cells in this image?
What is your definition of irregular? I see lots of roundish blobs with hairy borders, like the two large yellow blobs, that ar...

3 days ago | 0

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Using image processing tool measure the angle
Try this: clc; % Clear the command window. close all; % Close all figures (except those of imtool.) clear; % Era...

3 days ago | 0

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count number of ones in binary matrix
Do you really only care about the outer perimeter? So if the center is a 1, you want to ignore that? If so: mTemp = m; % ...

3 days ago | 0

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save image seen in imagesc
Try using imwrite() to save your indexed image: imwrite(Img, filename);

3 days ago | 0

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How can I transform points (pixel points) of the same different size images ?
Just multiply the row index of the points by the ratio of the row sizes, and the column index by the ratio of the column sizes. ...

3 days ago | 0

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I want to create a function z=f(a,b)..how can I create like this using the below code?
MATLAB documentation tells you how to make functions. Like, to make your "f" function you'd do this: function z = f(a, b) ...

4 days ago | 0

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Plot the two functions for a specific range
You need to define M(i) in both cases because it will get referenced and printed in both cases. Also, don't use "elseif i >...

4 days ago | 0

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I am making a mistake(s) but I can't catch it.
Close, but try it this way: age=[24,26,18,23,27,29,21,20,26,18,22,27]; height=[79 82 72 77 78 83 73 77 76 81 79 82]; ...

4 days ago | 0

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How to discard some portion of the image?
Use bwareafilt(): binaryImage = bwareafilt(binaryImage, [minArea, maxArea]); The values can range from 0 to inf.

4 days ago | 0

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How can I know which function that I used belongs to an additional toolbox rather than matlab?
Type control-shift-F to bring up the search dialog box. Tell it to search all *.m files in the path, or current folders and sub...

4 days ago | 0

Answered
Find closest 8-connected chessboard distance between multiple pairs of points: shortest m-path
See Steve's 5-part blog series on shortest path distances in images: <http://blogs.mathworks.com/steve/2011/11/01/exploring-shor...

4 days ago | 0

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