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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 i, j;
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44 int c;
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45
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46 int m = 16;
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47
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48 int print_psnr = 0;
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49 int print_psnr_only = 0;
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50 double error = 0.0;
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51
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52 progname = argv[0];
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53
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54 pgm_init(&argc, argv); wm_init();
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55
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56 while ((c = getopt(argc, argv, "h?i:m:o:pP")) != EOF) {
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57 switch (c) {
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58 case 'h':
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59 case '?':
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60 usage();
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61 break;
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62 case 'i':
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63 if ((orig = fopen(optarg, "rb")) == NULL) {
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64 fprintf(stderr, "%s: unable to open original image file %s\n", progname, optarg);
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65 exit(1);
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66 }
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67 strcpy(orig_name, optarg);
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68 break;
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69 case 'm':
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70 m = atoi(optarg);
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71 if (m <= 0) {
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72 fprintf(stderr, "%s: multiplication factor %d out of range\n", progname, m);
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73 exit(1);
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74 }
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75 break;
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76 case 'o':
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77 if ((out = fopen(optarg, "w")) == NULL) {
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78 fprintf(stderr, "%s: unable to open output file %s\n", progname, optarg);
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79 exit(1);
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80 }
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81 strcpy(output_name, optarg);
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82 break;
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83 case 'p':
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84 print_psnr = 1;
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85 break;
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86 case 'P':
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87 print_psnr_only = 1;
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88 break;
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89 }
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90 }
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91
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92 argc -= optind;
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93 argv += optind;
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94
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95 if (argc > 1) {
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96 usage();
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97 exit(1);
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98 }
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99
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8
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100 if (argc == 1 && *argv[0] != '-') {
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0
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101 if ((in = fopen(argv[0], "rb")) == NULL) {
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102 fprintf(stderr, "%s: unable to open input file %s\n", progname, argv[0]);
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103 exit(1);
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104 }
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105 else
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106 strcpy(input_name, argv[0]);
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8
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107 }
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108
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0
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109 if (!orig) {
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110 fprintf(stderr, "%s: original image file not specified, use -i file option\n", progname);
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111 exit(1);
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112 }
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113
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114 pgm_readpgminit(in, &in_cols, &in_rows, &in_maxval, &in_format);
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115
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116 pgm_readpgminit(orig, &orig_cols, &orig_rows, &orig_maxval, &orig_format);
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117
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118 if (in_cols != orig_cols || in_rows != orig_rows) {
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119 fprintf(stderr, "%s: input image %s does not match dimensions of original image %s\n", progname, input_name, orig_name);
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120 exit(1);
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121 }
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122
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8
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123 cols = in_cols;
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124 rows = in_rows;
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125 format = in_format;
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126 maxval = in_maxval;
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127
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0
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128 if (cols % NJPEG) {
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129 fprintf(stderr, "%s: image width %d not a multiple of %d\n", progname, cols, NJPEG);
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130 exit(1);
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131 }
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132
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133 if (rows % NJPEG) {
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134 fprintf(stderr, "%s: image height %d not a multiple of %d\n", progname, rows, NJPEG);
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135 exit(1);
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136 }
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137
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138 input_image = pgm_allocarray(cols, NJPEG);
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139 orig_image = pgm_allocarray(cols, NJPEG);
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140
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141 init_dct_8x8();
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142 input_dcts = alloc_coeffs_8x8();
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143 orig_dcts = alloc_coeffs_8x8();
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144 output = alloc_grays(cols, NJPEG);
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145
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146 if (!print_psnr_only)
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147 pgm_writepgminit(out, cols, rows, maxval, 0);
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148
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149 for (row = 0; row < rows; row += NJPEG) {
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150
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151 for (i = 0; i < NJPEG; i++) {
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152 pgm_readpgmrow(in, input_image[row % NJPEG], cols, maxval, format);
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153 pgm_readpgmrow(orig, orig_image[row % NJPEG], cols, maxval, format);
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154 }
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155
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156 for (col = 0; col < cols; col += NJPEG) {
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157 fdct_block_8x8(input_image, col, 0, input_dcts);
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158 fdct_block_8x8(orig_image, col, 0, orig_dcts);
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159
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160 for (i = 0; i < NJPEG; i++)
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161 for (j = 0; j < NJPEG; j++)
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162 error += sqr(input_dcts[j][i + cols] - orig_dcts[j][i + cols]);
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163 output[j][i + col] = PIXELRANGE(fabs(input_dcts[j][i + cols] - orig_dcts[j][i + cols]) * m);
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164 }
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165
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166 if (!print_psnr_only) {
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167 for (i = 0; i < NJPEG; i++)
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168 pgm_writepgmrow(out, output[i], cols, maxval, 0);
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169 }
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170
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171 }
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172 fclose(in);
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173 fclose(orig);
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174 if (!print_psnr_only)
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175 fclose(out);
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176
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177 pgm_freearray(input_image, NJPEG);
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178 pgm_freearray(orig_image, NJPEG);
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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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