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...

3 years 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...

3 years 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...

3 years ago

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...

4 years ago

Published

How imshowpair and imfuse work
In this post, I'll explore how imshowpair and imfuse work.Reason: I was curious.Last month, I wrote about registering...

4 years ago

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Registering Hand-Held Pictures
The typical modern French* horn, pictured below, has about 23 total feet of tubing. At the beginning and the end, the tubing...

4 years ago

Published

Transforming a color image to a weighted adjacency matrix
A question on MATLAB Answers caught my eye earlier today. Borys has this pseudocolor image of a weighted adjacency matrix:...

4 years ago

Published

How to Compute Perceptual Color Difference
I wrote previously about the new colorChecker, which can detect X-Rite test charts in the R2020b release. Another area of...

4 years ago

Published

Rediscovering Cody
Lately, I've been spending more time on MATLAB Central, and I'd like to encourage you to try out some of the resources...

4 years ago

Published

How to Detect an X-Rite® ColorChecker® Chart
When I saw this picture, I was really tempted to take it into the local garden nursery and ask them how to keep color...

4 years ago

Published

Making Color Spectrum Plots – Part 3
Recently, I've been explaining how I made this plot, which is from DIPUM3E (Digital Image Processing Using MATLAB, 3rd ed.):...

4 years ago

Published

What is 0.01?
I was looking at these two numbers the other day:$0.01$$\frac{5764607523034235}{576460752303423488}$It turns out they are...

4 years ago

Published

Making Color Spectrum Plots – Part 2
It was a while ago now, but on April 27 I started explaining how I made this plot, which is from DIPUM3E (Digital Image...

4 years ago

Published

Making Color Spectrum Plots – Part 1
The new edition of Digital Image Processing Using MATLAB (DIPUM3E) contains a number of MATLAB functions related to color,...

4 years ago

Published

Geometric Transformation of Points – Getting Started
I like to think of geometric transformations of images (stretching, shrinking, rotating, etc.) by starting with the...

5 years ago

Published

How to Display Color Swatches
When working on the "Color Image Processing" chapter of DIPUM3E, I found myself often wanting to display square blocks (or...

5 years ago

Published

Digital Image Processing Using MATLAB, 3rd edition
The 3rd edition of Digital Image Processing Using MATLAB (DIPUM3E) has just been published, at long last. The new edition...

5 years ago

Published

Treble clefs, Unicode, SVG, strings, Bézier curves, kron, implicit expansion, and polyshape
Today I will show you how I plotted this treble clef symbol in MATLAB: My discovery and implementation process for doing...

5 years ago

Published

How to Write Animated PNG (APNG) Files from MATLAB
Today, I'm writing about how to create animated PNG (APNG) files, such as this one: I first wrote about APNG files last...

5 years ago

Published

How to Go a Little Crazy with Graphics Titles
The title function is the third most commonly-used function in my 13 years of writing this blog, after imshow and imread....

5 years ago

Published

How to Overlay a Color on an Image Using a Mask
In my first year of writing this blog (2006!), I showed how to overlay a color onto an image based on a mask. This was the...

5 years ago

Published

How to Read and Visualize a DICOM Volume
Earlier this year, I learned something about DICOM datasets that surprised me. I had downloaded a Head-Neck CT+PET study,...

5 years ago

Published

Guess the functions and get a t-shirt
Of all the MATLAB or MathWorks toolbox functions that have been mentioned in this blog since 2006, imshow and imread have...

5 years ago

Published

How to display images with bilinear interpolation and antialiasing
Note: this blog post describes an image display feature that is new in R2019b. You can download this release from...

5 years ago

Published

The tool builder’s gene (or how to get a job at MathWorks)
In my second year of grad school (1987-88), my thesis advisor asked me to develop some PC-based digital signal...

5 years ago

Published

Using the Color Threshold app again
Back in the summer I had another chance to use the Color Thresholder, a very nice app that's in the Image Processing...

5 years ago

Published

Documenting performance improvements
I recently noticed a change in the way we write some of our product release notes, and I wanted to mention it to you.In my...

5 years ago

Published

New Hubble portrait of Jupiter
I thought this was worth sharing. From NASA's hubblesite.org: This new Hubble Space Telescope view of Jupiter,...

5 years ago

Published

Using reshape to rearrange image color components
I recently saw some code that transformed the RGB pixel values of an image into a Px3 matrix, such that each row contained...

5 years ago

Published

The curious case of ordfilt2 performance
For today's post, I'd like to welcome guest author Kushagr Gupta, a developer on the Image Processing Toolbox team....

5 years ago