[37] | 1 | /* |
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| 2 | * Speeded-Up Robust Features (SURF) |
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| 3 | * http://people.ee.ethz.ch/~surf |
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| 4 | * |
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| 5 | * Authors: Herbert Bay, Andreas Ess, Geert Willems |
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| 6 | * Windows port by Stefan Saur |
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| 7 | * |
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| 8 | * Copyright (2006): ETH Zurich, Switzerland |
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| 9 | * Katholieke Universiteit Leuven, Belgium |
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| 10 | * All rights reserved. |
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| 11 | * |
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| 12 | * For details, see the paper: |
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| 13 | * Herbert Bay, Tinne Tuytelaars, Luc Van Gool, |
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| 14 | * "SURF: Speeded Up Robust Features" |
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| 15 | * Proceedings of the ninth European Conference on Computer Vision, May 2006 |
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| 16 | * |
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| 17 | * Permission to use, copy, modify, and distribute this software and |
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| 18 | * its documentation for educational, research, and non-commercial |
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| 19 | * purposes, without fee and without a signed licensing agreement, is |
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| 20 | * hereby granted, provided that the above copyright notice and this |
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| 21 | * paragraph appear in all copies modifications, and distributions. |
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| 22 | * |
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| 23 | * Any commercial use or any redistribution of this software |
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| 24 | * requires a license from one of the above mentioned establishments. |
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| 25 | * |
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| 26 | * For further details, contact Andreas Ess (aess@vision.ee.ethz.ch). |
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| 27 | */ |
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| 28 | |
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| 29 | #include <iostream> |
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| 30 | #include <fstream> |
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| 31 | |
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| 32 | #include "imload.h" |
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| 33 | #include "image.h" |
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| 34 | |
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| 35 | namespace surf { |
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| 36 | |
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| 37 | #define MAX(x,y) (((x) > (y)) ? (x) : (y)) |
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| 38 | #define MIN(x,y) (((x) < (y)) ? (x) : (y)) |
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| 39 | #define ABS(x) (((x) > 0) ? (x) : (-(x))) |
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| 40 | |
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| 41 | using namespace std; |
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| 42 | |
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| 43 | void ignoreComments(ifstream& imfile) { |
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| 44 | char c; |
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| 45 | do { |
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| 46 | imfile >> c; |
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| 47 | } while (c == ' '); |
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| 48 | imfile.putback(c); |
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| 49 | |
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| 50 | imfile >> c; |
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| 51 | while (c == '#') { |
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| 52 | imfile.ignore(256, '\n'); |
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| 53 | imfile >> c; |
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| 54 | } |
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| 55 | imfile.putback(c); |
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| 56 | } |
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| 57 | |
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| 58 | Image *ImLoad::readImage(const char *fn){ |
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| 59 | ifstream imfile(fn, ios::binary); |
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| 60 | if (!imfile.is_open()){ |
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| 61 | cerr << "Sorry, could not open: " << fn << endl; |
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| 62 | exit(0); |
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| 63 | } |
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| 64 | |
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| 65 | // Reading file header |
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| 66 | char P; |
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| 67 | char num; |
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| 68 | imfile >> P >> num; |
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| 69 | ignoreComments(imfile); |
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| 70 | |
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| 71 | // Read image dimensions and extremum value |
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| 72 | int width, height, extr; |
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| 73 | imfile >> width; |
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| 74 | ignoreComments(imfile); |
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| 75 | imfile >> height; |
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| 76 | ignoreComments(imfile); |
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| 77 | imfile >> extr; |
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| 78 | |
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| 79 | // Check whether the file is OK |
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| 80 | if (P != 'P' || num != '5' || |
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| 81 | width <= 0 || height <= 0 || |
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| 82 | extr > 255) { |
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| 83 | cerr << "Input image has to be PGM format" << endl; |
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| 84 | exit(0); |
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| 85 | } |
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| 86 | |
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| 87 | // Get the image intensities and normalise to 0 - 1. |
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| 88 | imfile.get(); |
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| 89 | Image *im = new Image(width, height); |
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| 90 | for (int y = 0; y < height; y++) |
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| 91 | for (int x = 0; x < width; x++) |
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| 92 | im->setPix(x, y, ((double) imfile.get()) / extr); |
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| 93 | return im; |
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| 94 | } |
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| 95 | |
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| 96 | void ImLoad::saveImage(const char *fn, Image *im) { |
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| 97 | ofstream imfile(fn, ios::binary); |
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| 98 | if (!imfile.is_open()) { |
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| 99 | cerr << "Sorry, could not open: " << fn << endl; |
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| 100 | exit(0); |
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| 101 | } |
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| 102 | imfile << "P5" << endl; |
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| 103 | imfile << im->getWidth() << " " << im->getHeight() << " 255" << endl; |
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| 104 | for (int y = 0; y < im->getHeight(); y++) |
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| 105 | for (int x = 0; x < im->getWidth(); x++) |
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| 106 | imfile.put((unsigned char)(im->getPix(x, y) * 255)); |
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| 107 | } |
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| 108 | |
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| 109 | } |
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