Stefan Karlsson

Halmstad University

Last seen: 4 månader ago | Active since 2012

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Post doc in Image analysis/computer vision/biometrics Professional Interests: signal processing, biometrics, image analysis, computer vision

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Tutorial and Toolbox on real-time optical flow
Code with visualization and excercises. Camera supported

mer än 3 år ago | 6 downloads |

Answered
[DEPRECATED] What frustrates you about MATLAB?
I miss the ability to define your own workspace. When doing event driven programming in Matlab, there are 3 ways to share your o...

mer än 7 år ago | 0

Solved

Is my wife right?
Regardless of input, output the string 'yes'.

ungefär 8 år ago

Submitted

FancyFlowPlayer
Video Player with visualization and interactive reading.

ungefär 8 år ago | 7 downloads |

Submitted

Interactive Incompressible Fluids (Karlsson version)
An interactive demo of Navier-Stokes equations for incompressible fluids.

ungefär 8 år ago | 1 download |

Answered
Global workspace usage for efficiency?
Walters good points above are not an answer to my question. Let me try to give my point of view on this, and then anyone can fee...

ungefär 8 år ago | 0

Question

Global workspace usage for efficiency?
*Are there cases when using global variables is the most efficient implementation?* I hate using the global workspace, but I ...

mer än 8 år ago | 2 answers | 0

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Answered
Can I use PCA effectively on a greyscale image?
... I guess one can also give another piece of advice to anyone who stumbles onto this looking for info on PCA. Read the posts b...

mer än 8 år ago | 0

Answered
Can I use PCA effectively on a greyscale image?
I think the answer by Walter, while technically correct, confounds a VERY simple topic. Being technically correct here amounts t...

mer än 8 år ago | 0

Answered
Scale a mask in an image
use imresize. If you use it with interpolation 'nearest', you have your functionality in a single line. If you use another inter...

mer än 8 år ago | 1

Submitted

Real time optical flow, and video processing
Real time optical flow, and video processing, with support for camera input in Matlab.

mer än 8 år ago | 2 downloads |

Answered
timer and Interruptible=Off button callback priority/preemption?
Sometimes I get into the problem that I am in a function that is not interuptible. An ugly work-around that seems to work (o...

mer än 8 år ago | 0

Answered
Save data X over Y
Poorly asked question. Do you get 2 new X and Y matrices by regular intervals, or is time-dependency something represented by t...

mer än 8 år ago | 0

Answered
Which way is correct of defining function...I am getting two differnt surfaces if I specify same equation differently...?
There are 2 interpretations of your shared code (i.e. two ways i see that you would be able to run it without error). 1. you ...

mer än 8 år ago | 0

| accepted

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GUI figure focus
Seems this is still an issue, here is my solution quick fix: %takes any active uiobject as input, and returns keyboard fo...

ungefär 9 år ago | 0

Submitted

Visual Studio Toolbar for mex interface with video tutorial
Seamless interface, VS 2010 and 2012 and Matlab for MEX. Video linked to step you through.

mer än 9 år ago | 2 downloads |

Answered
[DEPRECATED] What frustrates you about MATLAB?
topping the wish-list: 1. A "beep off" that actually works, stops Matlab completely from making the OS beep sound. 2. A sh...

nästan 10 år ago | 0

Solved

Swap the first and last columns
Flip the outermost columns of matrix A, so that the first column becomes the last and the last column becomes the first. All oth...

ungefär 10 år ago

Submitted

Optical Flow with Matlabs Computer vision toolbox
optical flow on camera, synthetic video and video files

ungefär 10 år ago | 4 downloads |

Solved

Make a checkerboard matrix
Given an integer n, make an n-by-n matrix made up of alternating ones and zeros as shown below. The a(1,1) should be 1. Example...

ungefär 10 år ago

Solved

Find all elements less than 0 or greater than 10 and replace them with NaN
Given an input vector x, find all elements of x less than 0 or greater than 10 and replace them with NaN. Example: Input ...

mer än 10 år ago

Solved

Triangle Numbers
Triangle numbers are the sums of successive integers. So 6 is a triangle number because 6 = 1 + 2 + 3 which can be displa...

mer än 10 år ago

Solved

Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

mer än 10 år ago

Solved

Column Removal
Remove the nth column from input matrix A and return the resulting matrix in output B. So if A = [1 2 3; 4 5 6]; and ...

mer än 10 år ago

Solved

Select every other element of a vector
Write a function which returns every other element of the vector passed in. That is, it returns the all odd-numbered elements, s...

mer än 10 år ago

Solved

Add two numbers
Given a and b, return the sum a+b in c.

mer än 10 år ago

Solved

Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

mer än 10 år ago

Solved

Make the vector [1 2 3 4 5 6 7 8 9 10]
In MATLAB, you create a vector by enclosing the elements in square brackets like so: x = [1 2 3 4] Commas are optional, s...

mer än 10 år ago

Solved

Times 2 - START HERE
Try out this test problem first. Given the variable x as your input, multiply it by two and put the result in y. Examples:...

mer än 10 år ago

Submitted

VideoResize
A MUCH faster version of "imresize", specifically for videoprocessing

mer än 10 år ago | 1 download |

Stefan Karlsson

Halmstad University

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