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