2 * Image Library -- Duplicates Comparison
4 * (c) 2006 Pavel Charvat <pchar@ucw.cz>
6 * This software may be freely distributed and used according to the terms
7 * of the GNU Lesser General Public License.
13 #include "lib/mempool.h"
14 #include "lib/fastbuf.h"
15 #include "images/images.h"
16 #include "images/duplicates.h"
28 err_sum(byte *pos1, byte *pos2, uns count)
33 uns e = err(*pos1++, *pos2++);
34 e += err(*pos1++, *pos2++);
35 e += err(*pos1++, *pos2++);
42 err_sum_transformed(byte *pos1, byte *pos2, uns cols, uns rows, int row_step_1, int col_step_2, int row_step_2)
44 DBG("err_sum_transformed(pos1=%p pos2=%p cols=%u rows=%u row_step_1=%d col_step_2=%d row_step_2=%d)",
45 pos1, pos2, cols, rows, row_step_1, col_step_2, row_step_2);
47 for (uns j = rows; j--; )
52 for (uns i = cols; i--; )
54 e += err(p1[0], p2[0]);
55 e += err(p1[1], p2[1]);
56 e += err(p1[2], p2[2]);
68 aspect_ratio_test(struct image_dup_context *ctx, uns cols1, uns rows1, uns cols2, uns rows2)
70 DBG("aspect_ratio_test(cols1=%u rows1=%u cols2=%u rows2=%u)", cols1, rows1, cols2, rows2);
71 uns r1 = cols1 * rows2;
72 uns r2 = rows1 * cols2;
74 r1 <= ((r2 * ctx->ratio_threshold) >> 7) &&
75 r2 <= ((r1 * ctx->ratio_threshold) >> 7);
79 average_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2)
81 byte *block1 = image_dup_block(dup1, 0, 0);
82 byte *block2 = image_dup_block(dup2, 0, 0);
84 err(block1[0], block2[0]) +
85 err(block1[1], block2[1]) +
86 err(block1[2], block2[2]);
87 return e <= ctx->error_threshold;
91 blocks_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2, uns tab_col, uns tab_row, uns trans)
93 DBG("blocks_compare(tab_col=%d tab_row=%d trans=%d)", tab_col, tab_row, trans);
94 byte *block1 = image_dup_block(dup1, tab_col, tab_row);
96 int col_step, row_step;
98 block2 = image_dup_block(dup2, tab_col, tab_row);
100 block2 = image_dup_block(dup2, tab_row, tab_col);
104 uns err = (err_sum(block1, block2, 1 << (tab_col + tab_row)) >> (tab_col + tab_row));
105 DBG("average error=%d", err);
106 return err <= ctx->error_threshold;
109 row_step = (3 << tab_col);
110 block2 += row_step - 3;
114 row_step = -(3 << tab_col);
115 block2 += (3 << (tab_col + tab_row)) + row_step;
119 row_step = -(3 << tab_col);
120 block2 += (3 << (tab_col + tab_row)) - 3;
123 col_step = (3 << tab_row);
127 col_step = -(3 << tab_row);
129 block2 += (3 << (tab_col + tab_row)) + col_step;
132 col_step = (3 << tab_row);
134 block2 += col_step - 3;
137 col_step = -(3 << tab_row);
139 block2 += (3 << (tab_col + tab_row)) - 3;
144 uns err = (err_sum_transformed(block1, block2, (1 << tab_col), (1 << tab_row), (3 << tab_col), col_step, row_step) >> (tab_col + tab_row));
145 DBG("average error=%d", err);
146 return err <= ctx->error_threshold;
150 same_size_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2, uns trans)
152 struct image *img1 = &dup1->image;
153 struct image *img2 = &dup2->image;
154 byte *block1 = img1->pixels;
155 byte *block2 = img2->pixels;
156 int col_step, row_step;
157 DBG("same_size_compare(trans=%d)", trans);
162 row_step = img2->row_size;
166 row_step = img2->row_size;
167 block2 += 3 * (img2->cols - 1);
171 row_step = -img2->row_size;
172 block2 += img2->row_size * (img2->rows - 1);
176 row_step = -img2->row_size;
177 block2 += img2->row_size * (img2->rows - 1) + 3 * (img2->cols - 1);
180 col_step = img2->row_size;
184 col_step = -img2->row_size;
186 block2 += img2->row_size * (img2->rows - 1);
189 col_step = img2->row_size;
191 block2 += 3 * (img2->cols - 1);
194 col_step = -img2->row_size;
196 block2 += img2->row_size * (img2->rows - 1) + 3 * (img2->cols - 1);
201 uns err = (err_sum_transformed(block1, block2, img1->cols, img1->rows, img1->row_size, col_step, row_step) / ((u64)img1->cols * img1->rows));
202 DBG("average error=%d", err);
203 return err <= ctx->error_threshold;
207 image_dup_compare(struct image_dup_context *ctx, struct image_dup *dup1, struct image_dup *dup2)
209 DBG("image_dup_compare()");
210 if (!average_compare(ctx, dup1, dup2))
212 struct image *img1 = &dup1->image;
213 struct image *img2 = &dup2->image;
214 uns flags = ctx->flags;
215 if (flags & IMAGE_DUP_SCALE)
217 DBG("Scale support");
218 if (!aspect_ratio_test(ctx, img1->cols, img1->rows, img2->cols, img2->rows))
220 if (!aspect_ratio_test(ctx, img1->cols, img1->rows, img2->rows, img2->cols))
225 DBG("No scale support");
226 if (!(img1->cols == img2->cols && img1->rows == img2->rows))
228 if (!(img1->cols == img2->rows && img1->rows == img2->cols))
236 uns cols = MIN(dup1->tab_cols, dup2->tab_cols);
237 uns rows = MIN(dup1->tab_rows, dup2->tab_rows);
238 for (uns t = 0; t < 4; t++)
239 if (flags & (1 << t))
241 DBG("Testing trans %d", t);
242 for (uns i = MAX(cols, rows); i--; )
244 uns col = MAX(0, (int)(cols - i));
245 uns row = MAX(0, (int)(rows - i));
246 if (!blocks_compare(ctx, dup1, dup2, col, row, t))
249 (img1->cols != img2->cols || img1->rows != img2->rows ||
250 same_size_compare(ctx, dup1, dup2, t)))
253 if (!(flags & IMAGE_DUP_WANT_ALL))
263 uns cols = MIN(dup1->tab_cols, dup2->tab_rows);
264 uns rows = MIN(dup1->tab_rows, dup2->tab_cols);
265 for (uns t = 4; t < 8; t++)
266 if (flags & (1 << t))
268 DBG("Testing trans %d", t);
269 for (uns i = MAX(cols, rows); i--; )
271 uns col = MAX(0, (int)(cols - i));
272 uns row = MAX(0, (int)(rows - i));
273 if (!blocks_compare(ctx, dup1, dup2, col, row, t))
276 (img1->cols != img2->rows || img1->rows != img2->cols ||
277 same_size_compare(ctx, dup1, dup2, t)) )
280 if (!(flags & IMAGE_DUP_WANT_ALL))