1 #ifndef _IMAGES_SIGNATURE_H
2 #define _IMAGES_SIGNATURE_H
5 extern uns image_sig_min_width, image_sig_min_height;
6 extern uns *image_sig_prequant_thresholds;
7 extern uns image_sig_postquant_min_steps, image_sig_postquant_max_steps, image_sig_postquant_threshold;
8 extern double image_sig_textured_threshold;
11 #define IMAGE_REG_F IMAGE_VEC_F
13 #define IMAGE_REG_MAX 16
15 /* K-dimensional feature vector (6 bytes) */
17 byte f[IMAGE_VEC_F]; /* texture features */
20 /* Fetures for image regions (16 bytes) */
22 byte f[IMAGE_VEC_F]; /* texture features */
23 u16 h[IMAGE_REG_H]; /* shape features */
24 u16 wa; /* normalized area percentage */
25 u16 wb; /* normalized weight */
28 #define IMAGE_SIG_TEXTURED 0x1
30 /* Image signature (11 + len * 16 bytes) */
31 struct image_signature {
32 byte len; /* Number of regions */
33 byte flags; /* IMAGE_SIG_xxx */
34 byte df; /* Average f dist */
35 u16 dh; /* Average h dist */
36 struct image_vector vec; /* Combination of all regions... simple signature */
37 struct image_region reg[IMAGE_REG_MAX];/* Feature vector for every region */
41 image_signature_size(uns len)
43 return 5 + sizeof(struct image_vector) + len * sizeof(struct image_region);
48 #define IMAGE_VECTOR_DUMP_MAX (IMAGE_VEC_F * 16 + 1)
49 #define IMAGE_REGION_DUMP_MAX ((IMAGE_REG_F + IMAGE_REG_H) * 16 + 100)
51 byte *image_vector_dump(byte *buf, struct image_vector *vec);
52 byte *image_region_dump(byte *buf, struct image_region *reg);
54 struct image_sig_block {
55 struct image_sig_block *next; /* linked list */
56 u32 x, y; /* block position */
57 byte area; /* block area in pixels (usually 16) */
58 byte region; /* region index */
59 byte v[IMAGE_VEC_F]; /* feature vector */
62 struct image_sig_region {
63 struct image_sig_block *blocks;
72 struct image_sig_data {
74 struct image_sig_block *blocks;
75 struct image_sig_region regions[IMAGE_REG_MAX];
90 int compute_image_signature(struct image_thread *thread, struct image_signature *sig, struct image *image);
92 int image_sig_init(struct image_thread *thread, struct image_sig_data *data, struct image *image);
93 void image_sig_preprocess(struct image_sig_data *data);
94 void image_sig_finish(struct image_sig_data *data, struct image_signature *sig);
95 void image_sig_cleanup(struct image_sig_data *data);
99 void image_sig_segmentation(struct image_sig_data *data);
103 void image_sig_detect_textured(struct image_sig_data *data);
107 #define IMAGE_SIG_DIST_SCALE (3 + 3 + 8 + 16)
109 uns image_signatures_dist(struct image_signature *sig1, struct image_signature *sig2);