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0
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1 #include "wm.h"
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2 #include "pgm.h"
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3
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4 char *progname;
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5
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6 void usage(void) {
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3
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7 fprintf(stderr, "usage: %s [-C] [-h] [-m n] [-o file] [-pP] -i file file\n\n", progname);
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0
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8 fprintf(stderr, "\t-C\t\tprint PSNR value only\n");
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9 fprintf(stderr, "\t-h\t\tprint usage\n");
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10 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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11 fprintf(stderr, "\t-m n\t\tmultiplication factor (default auto)\n");
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12 fprintf(stderr, "\t-o file\t\toutput file for difference image\n");
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13 fprintf(stderr, "\t-p\t\tprint PSNR, RMS and MSE\n");
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14 fprintf(stderr, "\t-P\t\tonly print PSNR, RMS and MSE, no difference image\n");
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15 exit(0);
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16 }
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17
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18 int main(int argc, char *argv[]) {
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19
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20 FILE *in = stdin;
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21 FILE *out = stdout;
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22 FILE *orig = NULL;
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23
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24 gray **input_image;
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25 gray **orig_image;
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26
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27 char output_name[MAXPATHLEN] = "(stdout)";
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28 char input_name[MAXPATHLEN] = "(stdin)";
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29 char orig_name[MAXPATHLEN];
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30
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31 int in_cols, in_rows, in_format;
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32 gray in_maxval;
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33 int orig_cols, orig_rows, orig_format;
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34 gray orig_maxval;
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35 int cols, rows, format;
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36 gray maxval;
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37 int col, row;
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38
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39 int c;
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40
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41 int m = 0;
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42 int min, max;
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43
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44 int print_psnr = 0;
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45 int print_psnr_only = 0;
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46 int print_psnr_value_only = 0;
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47 double error = 0.0;
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48
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49 progname = argv[0];
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50
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51 pgm_init(&argc, argv); wm_init();
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52
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3
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53 while ((c = getopt(argc, argv, "h?i:m:o:pPC")) != EOF) {
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0
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54 switch (c) {
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55 case 'h':
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56 case '?':
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57 usage();
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58 break;
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59 case 'i':
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60 if ((orig = fopen(optarg, "rb")) == NULL) {
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61 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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62 exit(1);
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63 }
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64 strcpy(orig_name, optarg);
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65 break;
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66 case 'm':
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67 m = atoi(optarg);
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68 if (m <= 0) {
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69 fprintf(stderr, "%s: multiplication factor %d out of range\n", progname, m);
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70 exit(1);
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71 }
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72 break;
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73 case 'o':
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74 if ((out = fopen(optarg, "wb")) == NULL) {
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75 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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76 exit(1);
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77 }
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78 strcpy(output_name, optarg);
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79 break;
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80 case 'p':
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81 print_psnr = 1;
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82 break;
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83 case 'P':
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84 print_psnr_only = 1;
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85 break;
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86 case 'C':
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87 print_psnr_value_only = 1;
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88 print_psnr_only = 1;
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89 break;
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90 }
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91 }
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92
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93 argc -= optind;
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94 argv += optind;
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95
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96 if (argc > 1) {
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97 usage();
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98 exit(1);
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99 }
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100
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8
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101 if (argc == 1 && *argv[0] != '-') {
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0
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102 if ((in = fopen(argv[0], "rb")) == NULL) {
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103 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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104 exit(1);
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105 }
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106 else
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107 strcpy(input_name, argv[0]);
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8
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108 }
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109
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0
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110 if (!orig) {
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111 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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112 exit(1);
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113 }
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114
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115 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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116
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3
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117 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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0
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118
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3
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119 if (in_cols != orig_cols || in_rows != orig_rows) {
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120 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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121 exit(1);
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0
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122 }
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123
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124 cols = in_cols;
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125 rows = in_rows;
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126 format = in_format;
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127 maxval = in_maxval;
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128
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129 input_image = pgm_allocarray(cols, rows);
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130 orig_image = pgm_allocarray(cols, rows);
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131
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132 for (row = 0; row < rows; row++) {
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133 pgm_readpgmrow(in, input_image[row], cols, in_maxval, in_format);
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3
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134 pgm_readpgmrow(orig, orig_image[row], cols, orig_maxval, orig_format);
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0
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135 }
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136
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137 fclose(in);
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3
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138 fclose(orig);
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0
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139
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3
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140 min = max = abs(input_image[0][0] - orig_image[0][0]);
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0
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141
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142 for (row = 0; row < rows; row++) {
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143 gray *pi = input_image[row];
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144 gray *po = orig_image[row];
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145
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146 for (col = 0; col < cols; col++) {
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147 int diff = abs(*pi - *po);
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148 error += sqr(diff);
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149 if (diff < min) min = diff;
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150 if (diff > max) max = diff;
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151
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3
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152 pi++;
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153 po++;
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0
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154 }
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155 }
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156
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157 for (row = 0; row < rows; row++) {
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158 gray *pi = input_image[row];
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159 gray *po = orig_image[row];
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160
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161 for (col = 0; col < cols; col++) {
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162 int diff = abs(*pi - *po);
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3
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163 if (m > 0)
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164 *pi = PIXELRANGE(diff * m);
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165 else
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166 *pi = PIXELRANGE((double) (diff - min) / (double) (max - min) * maxval);
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0
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167
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168 pi++;
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169 po++;
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170 }
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171 }
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172
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173 if (!print_psnr_only) {
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174 pgm_writepgminit(out, cols, rows, maxval, 0);
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175 for (row = 0; row < rows; row++)
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176 pgm_writepgmrow(out, input_image[row], cols, maxval, 0);
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177
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178 fclose(out);
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179 }
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180
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181 pgm_freearray(input_image, rows);
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182 pgm_freearray(orig_image, rows);
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183
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184 if (print_psnr || print_psnr_only) {
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3
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185 double mse = error / (double) (cols * rows);
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0
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186 double rmse = sqrt(mse);
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3
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187 double psnr = 20.0 * log(255.0 / rmse) / log(10.0);
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0
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188 FILE *print = print_psnr_only ? out : stderr;
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189 if (!print_psnr_value_only) {
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190 if (mse > 0.0)
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191 fprintf(print, "PSNR: %lf dB\n", psnr);
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192 else
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193 fprintf(print, "PSNR: inf\n");
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194 fprintf(print, "RMSE: %lf\n", rmse);
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195 fprintf(print, "MSE: %lf\n", mse);
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196 fprintf(print, "dmin, dmax: %d, %d\n", min, max);
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197 }
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198 else
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199 fprintf(print, "%lf\n", mse > 0.0 ? psnr : 100.0);
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200 }
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201
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202 exit(0);
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203 }
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