### Maths Help please

Posted:

**12 May 2015, 06:31**The equation in the attached picture comes from a paper on book scanning mentioned here.

http://www.k2.t.u-tokyo.ac.jp/vision/BFS-Solo/

I don't have too much of a problem working with the maths BUT I cannot understand some of the symbols that are being used.

In particular there are two vertical parallel lines that are used throughout this equation. I have never seen anything like them in an equation.

I showed the equation to a retired engineering lecturer in my family and he had never seen anything like them before either.

So what do they mean?

I am building a conventional simple book scanner with a camera and a light rather like the cardboard box version that you are all probably familiar with, but I want to go further and

develop a more portable quick scanner which is why I am looking at this stuff. My conventional scanner works. I have tried it, but i am waiting for delivery of some anti-glare acrylic for the plattern.

If you don't know the answer it would also be useful if you were able to point me in the direction of somewhere else where I could ask.

http://www.k2.t.u-tokyo.ac.jp/vision/BFS-Solo/

I don't have too much of a problem working with the maths BUT I cannot understand some of the symbols that are being used.

In particular there are two vertical parallel lines that are used throughout this equation. I have never seen anything like them in an equation.

I showed the equation to a retired engineering lecturer in my family and he had never seen anything like them before either.

So what do they mean?

I am building a conventional simple book scanner with a camera and a light rather like the cardboard box version that you are all probably familiar with, but I want to go further and

develop a more portable quick scanner which is why I am looking at this stuff. My conventional scanner works. I have tried it, but i am waiting for delivery of some anti-glare acrylic for the plattern.

If you don't know the answer it would also be useful if you were able to point me in the direction of somewhere else where I could ask.