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10
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1 #include "wm.h"
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2 #include "ppm.h"
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3
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4 #define LUMINANCE 1
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5 #define RED 2
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6 #define GREEN 4
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7 #define BLUE 8
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8
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9 char *progname;
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10
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11 void usage(void) {
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12 fprintf(stderr, "usage: %s -c name [-C] [-h] [-m n] [-o file] [-pP] -i file file\n\n", progname);
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13 fprintf(stderr, "\t-c name\t\tcolor component (default luminance)\n");
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14 fprintf(stderr, "\t-C\t\tprint PSNR value only\n");
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15 fprintf(stderr, "\t-h\t\tprint usage\n");
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16 fprintf(stderr, "\t-i file\t\toriginal image file\n");
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17 fprintf(stderr, "\t-m n\t\tmultiplication factor (default 16)\n");
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18 fprintf(stderr, "\t-o file\t\toutput file\n");
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19 fprintf(stderr, "\t-p\t\tprint PSNR, RMS and MSE\n");
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20 fprintf(stderr, "\t-P\t\tonly print PSNR, RMS and MSE, no difference image\n");
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21 exit(0);
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22 }
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23
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24 int main(int argc, char *argv[]) {
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25
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26 FILE *in = stdin;
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27 FILE *out = stdout;
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28 FILE *orig = NULL;
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29
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30 pixel **input_image;
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31 pixel **orig_image;
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32
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33 char output_name[MAXPATHLEN] = "(stdout)";
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34 char input_name[MAXPATHLEN] = "(stdin)";
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35 char orig_name[MAXPATHLEN];
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36
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37 int in_cols, in_rows, in_format;
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38 pixval in_maxval;
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39 int orig_cols, orig_rows, orig_format;
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40 pixval orig_maxval;
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41 int cols, rows, format;
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42 pixval maxval;
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43 int col, row;
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44
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45 int c;
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46
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47 double error = 0.0;
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48 int print_psnr = 0;
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49 int print_psnr_only = 0;
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50 int print_psnr_value_only = 0;
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51
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52 int m = 16;
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53 int component = 0;
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54 int component_default = LUMINANCE;
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55 int min, max;
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56
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57 progname = argv[0];
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58
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59 ppm_init(&argc, argv);
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60
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61 #ifdef __EMX__
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62 _fsetmode(in, "b");
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63 _fsetmode(out, "b");
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64 #endif
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65
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66 while ((c = getopt(argc, argv, "Cc:h?i:m:o:pP")) != EOF) {
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67 switch (c) {
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68 case 'C':
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69 print_psnr_value_only = 1;
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70 print_psnr_only = 1;
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71 break;
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72 case 'c':
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73 if (!strcasecmp(optarg, "RED") || toupper(*optarg) == 'R')
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74 component |= RED;
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75 else if (!strcasecmp(optarg, "GREEN") || toupper(*optarg) == 'G')
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76 component |= GREEN;
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77 else if (!strcasecmp(optarg, "BLUE") || toupper(*optarg) == 'B')
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78 component |= BLUE;
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79 else if (!strcasecmp(optarg, "LUMINANCE") || toupper(*optarg) == 'L')
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80 component |= LUMINANCE;
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81 else
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82 fprintf(stderr, "%s: unknown color component %s\n", progname, optarg);
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83 break;
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84 case 'h':
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85 case '?':
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86 usage();
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87 break;
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88 case 'i':
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89 if ((orig = fopen(optarg, "rb")) == NULL) {
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90 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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91 exit(1);
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92 }
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93 strcpy(orig_name, optarg);
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94 break;
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95 case 'm':
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96 m = atoi(optarg);
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97 if (m <= 0) {
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98 fprintf(stderr, "%s: multiplication factor %d out of range\n", progname, m);
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99 exit(1);
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100 }
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101 break;
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102 case 'o':
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103 if ((out = fopen(optarg, "wb")) == NULL) {
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104 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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105 exit(1);
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106 }
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107 strcpy(output_name, optarg);
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108 break;
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109 case 'p':
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110 print_psnr = 1;
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111 break;
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112 case 'P':
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113 print_psnr_only = 1;
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114 break;
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115 }
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116 }
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117
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118 argc -= optind;
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119 argv += optind;
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120
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121 if (argc > 1) {
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122 usage();
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123 exit(1);
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124 }
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125
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126 if (argc == 1 && *argv[0] != '-') {
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127 if ((in = fopen(argv[0], "rb")) == NULL) {
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128 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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129 exit(1);
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130 }
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131 else
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132 strcpy(input_name, argv[0]);
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133 }
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134
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135 if (!orig) {
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136 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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137 exit(1);
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138 }
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139
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140 if (!component) {
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141 if (component_default)
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142 component = component_default;
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143 else {
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144 fprintf(stderr, "%s: color component(s) to compare not specified, use -c name option\n", progname);
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145 exit(1);
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146 }
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147 }
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148
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149 if (component & LUMINANCE && component & (RED | GREEN | BLUE)) {
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150 fprintf(stderr, "%s: unable to compare luminance AND color component\n", progname);
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151 exit(1);
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152 }
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153
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154 ppm_readppminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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155
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156 ppm_readppminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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157
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158 if (in_cols != orig_cols || in_rows != orig_rows) {
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159 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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160 exit(1);
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161 }
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162
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163 cols = in_cols;
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164 rows = in_rows;
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165 format = in_format;
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166 maxval = in_maxval;
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167
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168 input_image = ppm_allocarray(cols, rows);
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169
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170 for (row = 0; row < rows; row++)
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171 ppm_readppmrow(in, input_image[row], cols, in_maxval, in_format);
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172
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173 fclose(in);
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174
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175 orig_image = ppm_allocarray(cols, rows);
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176
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177 for (row = 0; row < rows; row++)
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178 ppm_readppmrow(orig, orig_image[row], cols, orig_maxval, orig_format);
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179
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180 fclose(orig);
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181
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182 if (component & LUMINANCE)
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183 min = max = abs(PPM_LUMIN(input_image[0][0]) - PPM_LUMIN(orig_image[0][0]));
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184 else {
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185 if (component & RED)
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186 min = max = abs(PPM_GETR(input_image[0][0]) - PPM_GETR(orig_image[0][0]));
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187 else if (component & GREEN)
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188 min = max = abs(PPM_GETG(input_image[0][0]) - PPM_GETG(orig_image[0][0]));
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189 else if (component & BLUE)
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190 min = max = abs(PPM_GETB(input_image[0][0]) - PPM_GETB(orig_image[0][0]));
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191 else
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192 min = max = 0;
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193 }
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194
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195 for (row = 0; row < rows; row++) {
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196 pixel *pi = input_image[row];
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197 pixel *po = orig_image[row];
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198
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199 for (col = 0; col < cols; col++) {
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200 int diff=0;
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201
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202 if (component & LUMINANCE) {
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203 pixval l;
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204 diff = abs(PPM_LUMIN(*pi) - PPM_LUMIN(*po));
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205 error += sqr(PPM_LUMIN(*pi) - PPM_LUMIN(*po));
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206 l = PIXELRANGE(ROUND(abs(PPM_LUMIN(*pi) - PPM_LUMIN(*po)) * m));
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207 PPM_ASSIGN(*pi, l, l, l);
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208 }
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209 else {
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210 if (component & RED) {
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211 diff = abs(PPM_GETR(*pi) - PPM_GETR(*po));
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212 error += sqr(PPM_GETR(*pi) - PPM_GETR(*po));
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213 PPM_PUTR(*pi, PIXELRANGE(abs(PPM_GETR(*pi) - PPM_GETR(*po)) * m));
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214 }
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215 else
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216 PPM_PUTR(*pi, 0);
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217 if (component & GREEN) {
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218 diff = abs(PPM_GETG(*pi) - PPM_GETG(*po));
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219 error += sqr(PPM_GETG(*pi) - PPM_GETG(*po));
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220 PPM_PUTG(*pi, PIXELRANGE(abs(PPM_GETG(*pi) - PPM_GETG(*po)) * m));
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221 }
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222 else
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223 PPM_PUTG(*pi, 0);
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224 if (component & BLUE) {
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225 diff = abs(PPM_GETB(*pi) - PPM_GETB(*po));
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226 error += sqr(PPM_GETB(*pi) - PPM_GETB(*po));
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227 PPM_PUTB(*pi, PIXELRANGE(abs(PPM_GETB(*pi) - PPM_GETB(*po)) * m));
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228 }
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229 else
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230 PPM_PUTB(*pi, 0);
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231 }
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232
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233 if (diff < min) min = diff;
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234 if (diff > max) max = diff;
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235 pi++;
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236 po++;
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237 }
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238 }
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239
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240 if (!print_psnr_only) {
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241 ppm_writeppminit(out, cols, rows, maxval, 0);
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242 for (row = 0; row < rows; row++)
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243 ppm_writeppmrow(out, input_image[row], cols, maxval, 0);
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244
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245 fclose(out);
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246 }
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247
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248 ppm_freearray(input_image, rows);
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249 ppm_freearray(orig_image, rows);
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250
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251 if (print_psnr || print_psnr_only) {
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252 double mse = error / (double) (cols * rows);
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253 double rmse = sqrt(mse);
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254 double psnr = 20.0 * log(255.0 / rmse) / log(10.0);
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255 FILE *print = print_psnr_only ? out : stderr;
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256 if (!print_psnr_value_only) {
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257 if (mse > 0.0)
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258 fprintf(print, "PSNR: %lf dB\n", psnr);
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259 else
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260 fprintf(print, "PSNR: inf\n");
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261 fprintf(print, "RMS: %lf\n", rmse);
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262 fprintf(print, "MSE: %lf\n", mse);
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263 fprintf(print, "dmin, dmax: %d, %d\n", min, max);
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264 }
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265 else
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266 fprintf(print, "%lf\n", mse > 0.0 ? psnr : 100.0);
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267 }
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268
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269 exit(0);
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270 }
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