86 lines
2.6 KiB
C++
86 lines
2.6 KiB
C++
// Copyright 2003, 2004 David Hilvert <dhilvert@auricle.dyndns.org>,
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// <dhilvert@ugcs.caltech.edu>
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/* This file is part of the Anti-Lamenessing Engine.
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The Anti-Lamenessing Engine is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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The Anti-Lamenessing Engine is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with the Anti-Lamenessing Engine; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __psf_circle_h__
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#define __psf_circle_h__
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#include "../../point.h"
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#include "psf.h"
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/*
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* Point-spread function module.
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*
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* This module implements a circular filter.
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*/
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class circle : public psf {
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ale_real _radius;
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public:
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/*
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* The following four functions indicate filter boundaries. Filter
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* support may include everything up to and including the boundaries
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* specified here.
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*/
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ale_real min_i() const { return -_radius; }
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ale_real max_i() const { return _radius; }
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ale_real min_j() const { return -_radius; }
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ale_real max_j() const { return _radius; }
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/*
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* Response function
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*
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* Get the response to the rectangle bounded by (top, bot, lef, rig).
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* This function must correctly handle points which fall outside of the
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* filter support. The variety of the responding pixel is provided, in
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* case response is not uniform for all pixels (e.g. some sensor arrays
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* stagger red, green, and blue sensors).
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*/
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psf_result operator()(ale_real top, ale_real bot, ale_real lef, ale_real rig,
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unsigned int variety) const {
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psf_result result;
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for (int k = 0; k < 3; k++)
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result.matrix(k, k) = 0;
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ale_real total = (bot - top) * (rig - lef) / (M_PI * _radius * _radius);
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for (int i = 0; i < 10; i++)
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for (int j = 0; j < 10; j++) {
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ale_real one_half = 1 / (ale_real) 2;
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ale_real r = pow(top + (bot - top) * ((i + one_half) / (ale_real) 10), 2)
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+ pow(lef + (rig - lef) * ((j + one_half) / (ale_real) 10), 2);
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if (r < _radius * _radius)
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for (int k = 0; k < 3; k++)
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result.matrix(k, k) += (total / (ale_real) 100);
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}
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return result;
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}
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circle(ale_real radius) {
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_radius = radius;
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}
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};
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#endif
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