001/**
002 * Copyright (c) 2011, The University of Southampton and the individual contributors.
003 * All rights reserved.
004 *
005 * Redistribution and use in source and binary forms, with or without modification,
006 * are permitted provided that the following conditions are met:
007 *
008 *   *  Redistributions of source code must retain the above copyright notice,
009 *      this list of conditions and the following disclaimer.
010 *
011 *   *  Redistributions in binary form must reproduce the above copyright notice,
012 *      this list of conditions and the following disclaimer in the documentation
013 *      and/or other materials provided with the distribution.
014 *
015 *   *  Neither the name of the University of Southampton nor the names of its
016 *      contributors may be used to endorse or promote products derived from this
017 *      software without specific prior written permission.
018 *
019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
029 */
030/**
031 * 
032 */
033package org.openimaj.image.processing.convolution;
034
035import org.openimaj.image.FImage;
036
037/**
038 *      Compass operators that are used by the Liu and Samarabandu
039 *      text extraction.
040 *
041 *      @author David Dupplaw (dpd@ecs.soton.ac.uk)
042 *  @created 9 Aug 2011
043 *      
044 */
045public class CompassOperators
046{
047        /**
048         * The Compass0 operator
049         * @author David Dupplaw (dpd@ecs.soton.ac.uk)
050         */
051        static public class Compass0 extends FConvolution
052        {
053                /**
054                 * Default constructor
055                 */
056                public Compass0()
057                {
058                        super( new FImage( new float[][]{
059                                        {-1,-1,-1},
060                                        { 2, 2, 2},
061                                        {-1,-1,-1}
062                        }));
063                }
064        }
065
066        /**
067         * The Compass45 operator
068         * @author David Dupplaw (dpd@ecs.soton.ac.uk)
069         */
070        static public class Compass45 extends FConvolution
071        {
072                /**
073                 * Default constructor
074                 */
075                public Compass45()
076                {
077                        super( new FImage( new float[][]{
078                                        {-1,-1, 2},
079                                        {-1, 2,-1},
080                                        { 2,-1,-1}
081                        }));
082                }
083        }
084
085        /**
086         * The Compass90 operator
087         * @author David Dupplaw (dpd@ecs.soton.ac.uk)
088         */
089        static public class Compass90 extends FConvolution
090        {
091                /**
092                 * Default constructor
093                 */
094                public Compass90()
095                {
096                        super( new FImage( new float[][]{
097                                        {-1, 2,-1},
098                                        {-1, 2,-1},
099                                        {-1, 2,-1}
100                        }));
101                }
102        }
103
104        /**
105         * The Compass135 operator
106         * @author David Dupplaw (dpd@ecs.soton.ac.uk)
107         */
108        static public class Compass135 extends FConvolution
109        {
110                /**
111                 * Default constructor
112                 */
113                public Compass135()
114                {
115                        super( new FImage( new float[][]{
116                                        { 2,-1,-1},
117                                        {-1, 2,-1},
118                                        {-1,-1, 2}
119                        }));
120                }
121        }
122}