# Name that image process!

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• 09-02-2009
abachler
Name that image process!
OK I have a few interestign (at least to me) image processing effects. Lets see if you guys can name the mathematical methods used to generate them :)

Here is the first one, hint its not a simple negative -
• 09-02-2009
VirtualAce
Looks like a Sobel filter.
• 09-03-2009
brewbuck
Well, that looks like the result of an edge filter, probably Sobel or Laplace, applied individually to each color channel. But knowing you, it's probably some weird neural network thing

As far as what those operations actually are, Laplace is a simple convolution with a 3x3 kernel with coefficients [ 1 1 1 ][ 1 -8 1 ][ 1 1 1 ] and Sobel is a magnitude interpolation between a horizontal and vertical gradient approximation kernel, I believe for vertical it is [1 0 -1][-2 0 2][1 0 -1] and for horizontal [1 -2 1][0 0 0][-1 2 -1]

Note that the "Laplace" kernel in image processing is not the true discrete Laplace kernel, as what would be used for physics simulations. That kernel is [0 1 0][1 -4 1][0 1 0]
• 09-03-2009
VirtualAce
I was taken aback by the posterized nature of the edges. It does seem as if a Sobel or some edge detect was done on the individual channels and then the merged into one image. However if the original photo had sharp color transitions then this could be produced by a simple Sobel filter or some other edge detection process.

So to add to my guess he probably posterized the orgiinal image and then did an edge detect on it. But this question is almost like giving us some arbitrary number and asking us how he arrived at that number.
• 09-04-2009
abachler
Well you know my contests, I never give you all the info, I like to see how crazy and outrageous people get with that noodle between their ear bones.

Its actually much simpler than a sobel filter, it was actually designed for motion detection.

I did a time lapse historical average, with full storage of the last 100 frames, then I XOR'd it with the current image. Areas that didnt change would have zero values, areas that did change would have non-zero values.

Here is another one -
• 09-09-2009
quzah
"Here's some random crap I did. Guess what random crap I did." ... doesn't seem like much of a contest.

Quzah.
• 09-19-2009
abachler
Quote:

Originally Posted by quzah
"Here's some random crap I did. Guess what random crap I did." ... doesn't seem like much of a contest.

Quzah.

Yeah here's some more crap you didn't do, Guess what random crap you didn't do.
• 09-19-2009
SlyMaelstrom
Quote:

Originally Posted by abachler
Yeah here's some more crap you didn't do, Guess what random crap you didn't do.

I gotta go with Quzah on this one... looks like you're just abstract the fact that you wanted to brag about your project by modestly wrapping a very obscure contest around it. Why you would do this, I don't know... people post their projects all of the time in either the Tech Board forum or the Projects & Job Recruitment forum and they get plenty of attention. Why don't you just make a post like that and tell us about what you did? I'd be interested in knowing about it.

... oh, and throw a shirt on while you're at it. :)
• 09-19-2009
VirtualAce
Yeah abachler do you ever wear a shirt? Or are you hoping the ladies might take note on this board? Sorry to tell you but I don't think many frequent this board. :D

One of those looks like an emboss filter or perhaps a bump map filter.
• 09-19-2009
Sebastiani
Quote:

Originally Posted by Bubba
Yeah abachler do you ever wear a shirt?

Come to think of it, he might not be wearing any pants, either. :D
• 09-20-2009
abachler
Quote:

Originally Posted by SlyMaelstrom
... oh, and throw a shirt on while you're at it. :)

NO!!!

If I do that whats next, a demand that I wear pants too? :D
• 09-20-2009
stevesmithx
For a second i thought i was seeing jack nicholson. :p
• 09-20-2009
Sebastiani
Quote:

Originally Posted by abachler
NO!!!

If I do that whats next, a demand that I wear pants too?

I don't see what a piece of fabric has to do with writing correct programs. It's completely immaterial, really (take that literally, if you like).

Real programmers don't need clothes.
• 09-20-2009
abachler
Changed it a bit and got better results ;)
• 09-20-2009
Sebastiani
Wow, big diff. What's the process being used to generate the upper right-hand image? I really don't know a whole lot about what filters do what, so I can't even begin to guess (except that it's some sort of edge-detector). But yeah, whatever you did, it looks a lot better.
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