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 */ 030package org.openimaj.image.processing.resize.filters; 031 032import org.openimaj.citation.annotation.Reference; 033import org.openimaj.citation.annotation.ReferenceType; 034import org.openimaj.image.processing.resize.ResizeFilterFunction; 035 036/** 037 * Hamming window function interpolation filter for the resample function 038 * 039 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk) 040 * 041 */ 042@Reference( 043 author = { "R. B. Blackman", "J. W. Tukey" }, 044 title = "Particular Pairs of Windows", 045 type = ReferenceType.Inbook, 046 year = "1959", 047 booktitle = " In The Measurement of Power Spectra, From the Point of View of Communications Engineering", 048 publisher = "Dover", 049 pages = { "98", "99" }) 050public class HammingFilter implements ResizeFilterFunction { 051 @Override 052 public final double filter(final double t) { 053 return 0.54 + 0.46 * Math.cos(Math.PI * t); 054 } 055 056 @Override 057 public final double getSupport() { 058 return 1.0; 059 } 060}