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Neural Network OCR

, 11 Aug 2005 GPL3
Some ideas about optical character recognition using neural networks.
// AForge Math Library
//
// Copyright � Andrew Kirillov, 2005
// andrew.kirillov@gmail.com
//

namespace AForge.Math
{
	using System;
	
	/// <summary>
	/// Complex number
	/// </summary>
	public struct Complex
	{
		public float	Re;		// real component
		public float	Im;		// imaginary component
		
		// Get zero value
		public static Complex Zero
		{
			get { return new Complex(0, 0); }
		}
		
		// Get magnitude (absolute) value
		public float Magnitude
		{
			get { return (float) System.Math.Sqrt(Re * Re + Im * Im); }
		}

		// Get phase value
		public float Phase
		{
			get { return (float) System.Math.Atan(Im / Re); }
		}
		
		// Get squred magnitude value
		public float SquaredMagnitude
		{
			get { return (Re * Re + Im * Im); }
		}
	
	
		// Constructors
		public Complex(float re, float im)
		{
			this.Re = re;
			this.Im = im;
		}
		public Complex(Complex c)
		{
			this.Re = c.Re;
			this.Im = c.Im;
		}
		
		// Get complex number as string
		public override string ToString()
		{
			return String.Format("{0}{1}{2}i", Re, ((Im < 0) ? '-' : '+'), Math.Abs(Im));
		}
		
		// Add two complex numbers
		public static Complex operator+(Complex a, Complex b)
		{
			return new Complex(a.Re + b.Re, a.Im + b.Im);
		}

		// Subtract two complex numbers
		public static Complex operator-(Complex a, Complex b)
		{
			return new Complex(a.Re - b.Re, a.Im - b.Im);
		}
		
		// Multiply two complex numbers
		public static Complex operator*(Complex a, Complex b)
		{
			return new Complex(
				a.Re * b.Re - a.Im * b.Im,
				a.Re * b.Im + a.Im * b.Re);
		}

		// Divide one complex number by another
		public static Complex operator/(Complex a, Complex b)
		{
			float divider = b.Re * b.Re + b.Im * b.Im;
			
			if (divider == 0)
				throw new DivideByZeroException();
		
			return new Complex(
				(a.Re * b.Re + a.Im * b.Im) / divider,
				(a.Im * b.Re - a.Re * b.Im) / divider);
		}
	}
}

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License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

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About the Author

Andrew Kirillov
Software Developer IBM
United Kingdom United Kingdom
Started software development at about 15 years old and it seems like now it lasts most part of my life. Fortunately did not spend too much time with Z80 and BK0010 and switched to 8086 and further. Similar with programming languages – luckily managed to get away from BASIC and Pascal to things like Assembler, C, C++ and then C#. Apart from daily programming for food, do it also for hobby, where mostly enjoy areas like Computer Vision, Robotics and AI. This led to some open source stuff like AForge.NET and not so open Computer Vision Sandbox.

Going out of computers I am just a man loving his family, enjoying traveling, a bit of books, a bit of movies and a mixture of everything else. Always wanted to learn playing guitar, but it seems like 6 strings are much harder than few dozens of keyboard’s keys. Will keep progressing ...

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