# Steve Eddins

### MathWorks

MATLAB user since 1987. MathWorker since 1993. Amateur French horn player. MATLAB design and development, image processing algorithms.

Image processing blog: https://blogs.mathworks.com/steve/

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**Content Feed**

How do I transform this format 202007011030 (2020 07 01 10:30) into a readabel format?

I can imagine several ways to do this. Here is one. lines = readlines("Fehmarn_Wind_date.txt"); readlines was introduced in R2...

5 jours ago | 0

ROI Trace boundaries result

I think some careful coordinate system tweaks will get you there. In many Image Processing Toolbox functions, pixels are treated...

10 jours ago | 2

How is the 2D filter function used in this code?

For each element in A, filter2 essentially "slides" the filter F so that its center lines up with the element in A, and then it ...

11 jours ago | 1

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Changing color of pixels around certain pixels

Suppose mask is a logical matrix that indicates which pixels satisfy your condition. (That seems to be the purpose of idx in you...

13 jours ago | 2

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Colorbar range inconsistent in high aspect ratio images

Call axis image before you create the colorbar and set its tick labels. When you set tick labels manually, a mode is set so that...

19 jours ago | 0

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Can a MATLAB function edit the input?

You'll need your class to subclass handle. See the documentation page "Implementing Linked Lists with Classes" for details.

5 mois ago | 0

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Matlab working very slow on my m1 MacBook Pro

See this answer and follow it for updates related to this problem.

7 mois ago | 2

Shouldn't bwconvhull() be idempotent?

Hi Matt, At a general level - and speaking from too much personal experience - expectations about geometrical operations such a...

7 mois ago | 2

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Issue in plotting binary image boundaries with real axis values

The function bwboundaries returns boundary values in pixel coordinates. You'll need to scale those to world coordinates yourself...

7 mois ago | 0

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How to change boundary width in Active Contour Method?

Call visboundaries with an output argument. That output argument will be an hggroup object containing two lines. You can then ma...

7 mois ago | 0

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Published

Use imbinarize to Threshold Gray-Scale Images

Today, I want to convince you to use imbinarize instead of im2bw.Background: I recently saw some data suggesting that many...

7 mois ago

Published

NaN Sightings

Some of us at MathWorks like to share our "NaN sightings." Here is an example to show what I mean. This is a screenshot of...

8 mois ago

Published

How to Use a Custom Interpolation Kernel with imresize

Recently, I was talking with MathWorks writer Jessica Bernier about the reference page for the imresize function. Jessica...

9 mois ago

Published

How to Run Blog Post Code in Your Browser

I have published more than 560 blog posts here since 2006, and I estimate that about 98% of them started out as MATLAB...

9 mois ago

Published

Plotting a* and b* colors

Today's blog post comes from planning one topic, but then taking a sharp left turn and doing something else completely. I...

9 mois ago

Having graycomatrix rescaling problem

Here is the doc for the NumLevels parameter: Number of gray levels, specified as an integer. For example, if NumLevels is 8, gr...

10 mois ago | 0

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How to find the center position under the saturation spot signal

Try converting the image to binary using imbinarize and then using regionprops to compute the centroid. rgb = imread('image.bmp...

10 mois ago | 0

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How to bold x axis labels

Try setting the TickLabelsInterpreter property to 'tex', like this: plot(1:10) ax = gca; ax.XAxis.TickLabelInterpreter = 'tex...

10 mois ago | 0

three difference vectors and plots

I have copy-pasted your code below, exactly as entered in your question. It runs and produces the plot with no error. I suggest ...

10 mois ago | 2

Problem with datetime and daily values

Use a timetable and the retime function. >> T = readtable("data.xlsx"); >> head(T) ans = 8×5 table Date ...

10 mois ago | 0

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What is the best way to count the occurrences of two table columns together?

In my previous answer, I forgot that grpstats is in the Statistics and Machine Learning Toolbox. Here is an answer using groupsu...

10 mois ago | 1

What is the best way to count the occurrences of two table columns together?

I think grpstats will do what you want: >> grpstats(T,["A" "B"]) ans = 4×3 table A B Grou...

10 mois ago | 0

Find peaks not working on my data set

I suspect the issue is with the x-coordinates that you are using to plot the peaks. You are plotting the peaks against the indic...

11 mois ago | 1

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Assign values in a matrix

One idea is to use a timetable and the retime function. Suppose I have the following matrix for a 4-minute charge and a 3-minute...

11 mois ago | 0

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Code is showing Undefined function 'pixelHull' for input arguments of type 'double'.

I wrote a function called pixelHull as part of my 16-Mar-2018 blog post. You can find the function listing near the bottom of th...

11 mois ago | 0

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Published

FFT Spectral Leakage

A MATLAB user recently contacted MathWorks tech support to ask why the output of fft did not meet their expectations, and...

11 mois ago

Binarize image for specific colour

Use the Color Thresholder app to generate the code needed to do this segmentation. See my 14-Oct-2019 and 25-Apr-2014 blog posts...

12 mois ago | 0

Plotting signal of a region of interest

A possible explanation is that you have a variable called "size" or "mean" in your workspace. For example, if you have a variabl...

12 mois ago | 0

How to apply a threshold value to the cell array

I think writing a for-loop would be most straightforward way to go. Something like this: for k = 1:numel(C) C_k = C{k}; ...

12 mois ago | 1

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How to change the font of a pie chart?

The text labels created by the pie function are not controlled by the font properties of the containing axes object. They are in...

12 mois ago | 2

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