distance used for Image comparaison [closed] - matlab

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I was wondering what kind of formula I could use to compare 2 images.
I usually ue the Mean Square Error (or PSNR) but this isn't good enough.
I need to find a formula that return a very big distance between an image A and its pixellated (or blurred) version B, but I don't know how to proceed.
Has anyone an idea?

Do an edge detection on the images, and use those for your PSNR comparison.

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how does the histogram of optical flow work? [closed]

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I surf the web for HOF implementation in matlab or openCV. Actually I wanted to know how to write their code in matlab. I learned something from the link bellow about HOG but I cannot find the same proper link for HOF or MBH. Is there any syntax for HOF in openCV?
http://www.learnopencv.com/histogram-of-oriented-gradients/
I dont know about OpenCV, but find matlab implementations here.

Reconstruct fractal in Apollonian Gasket style [closed]

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I wondered if the following picture can be reconstructed programmatically:
It seems it has some features of an Apollonian Gasket (see https://en.wikipedia.org/wiki/Apollonian_gasket) but also includes other pattern which I don't recognise.
Any ideas?
This picture is made with open source software Apophysis. It is a so called fractal flame - fractal structure made with ifs (iteration functions system).

Group Algebra in Matlab [closed]

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What is the best way to implement group algebra using Matlab. More specifically, I only want to work with permutation groups (and their subgroups) but would like a way to find kernels and cosets without coding a brute force version myself.
GAP is a 'System for Computational Discrete Algebra' and is able to do all the things requested in the question.

How measure distance between to objects using Camera in iPhone? [closed]

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I want to measure distance between two moving cars by using Camera of Iphone. How can this will be possible ?
With your Fingers.
It is possible if you have a setup where you know the distance between 2 points then use this as a ratio

What CMS does Forrst Use? [closed]

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I tried looking it up on several places. Anyone know?
I would suggest that the whole site was a custom built application however why don't you try asking them? The worst they could say is go away - hello#forrst.com