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