Local Intensity Order Pattern (LIOP) descriptor - Definition. More...
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Defines | |
| #define | DEFAULT_INTENSITY_THRESHOLD -(5.0/255) |
| #define | DEFAULT_NUM_NEIGHBOURS 4 |
| #define | DEFAULT_NUM_SPATIAL_BINS 6 |
| #define | DEFAULT_RADIUS 6.0 |
| #define | VL_QSORT_array VlLiopDesc* |
| #define | VL_QSORT_array VlLiopDesc* |
| #define | VL_QSORT_cmp patch_cmp |
| #define | VL_QSORT_cmp neigh_cmp |
| #define | VL_QSORT_prefix patch |
| #define | VL_QSORT_prefix neigh |
| #define | VL_QSORT_swap patch_swap |
| #define | VL_QSORT_swap neigh_swap |
Functions | |
| static vl_int | factorial (vl_int num) |
| VL_INLINE vl_index | get_permutation_index (vl_uindex *permutation, vl_size size) |
| VL_INLINE float | neigh_cmp (VlLiopDesc *liop, vl_index i, vl_index j) |
| VL_INLINE void | neigh_swap (VlLiopDesc *liop, vl_index i, vl_index j) |
| VL_INLINE float | patch_cmp (VlLiopDesc *liop, vl_index i, vl_index j) |
| VL_INLINE void | patch_swap (VlLiopDesc *liop, vl_index i, vl_index j) |
| void | vl_liopdesc_delete (VlLiopDesc *self) |
| Delete object instance. | |
| vl_size | vl_liopdesc_get_dimension (VlLiopDesc const *self) |
| Get the dimension of a LIOP descriptor. | |
| float | vl_liopdesc_get_intensity_threshold (VlLiopDesc const *self) |
| Get the intensity threshold. | |
| double | vl_liopdesc_get_neighbourhood_radius (VlLiopDesc const *self) |
| Get the neighbourhood radius. | |
| vl_size | vl_liopdesc_get_num_neighbours (VlLiopDesc const *self) |
| Get the number of neighbours. | |
| vl_size | vl_liopdesc_get_num_spatial_bins (VlLiopDesc const *self) |
| Get the number of spatial bins. | |
| VlLiopDesc * | vl_liopdesc_new (vl_int numNeighbours, vl_int numSpatialBins, float radius, vl_size sideLength) |
| Create a new LIOP object instance. | |
| VlLiopDesc * | vl_liopdesc_new_basic (vl_size sideLength) |
| Create a new object with default parameters. | |
| void | vl_liopdesc_process (VlLiopDesc *self, float *desc, float const *patch) |
| Compute liop descriptor for a patch. | |
| void | vl_liopdesc_set_intensity_threshold (VlLiopDesc *self, float x) |
| Set the intensity threshold. | |
Detailed Description
Local Intensity Order Pattern (LIOP) descriptor - Definition.
Definition in file liop.c.
Define Documentation
| #define DEFAULT_INTENSITY_THRESHOLD -(5.0/255) |
$ into a vector ${h}$ and then normalising it:
\[ = {{h}}{\|{h}\|_2} \]
The dimensionality is therefore $m n!$, where $m$ is the numSpatialBins number of spatial bins and $n$ is the numNeighbours number of neighbours (see vl_liopdesc_new). By default, this descriptor is stored in single format. It can be stored as a sequence of bytes by premultiplying the values by the constant 255 and then rounding:
\[ {round}[ 255\, ]. \]
| #define DEFAULT_NUM_NEIGHBOURS 4 |
| #define DEFAULT_NUM_SPATIAL_BINS 6 |
| #define DEFAULT_RADIUS 6.0 |
| #define VL_QSORT_array VlLiopDesc* |
| #define VL_QSORT_array VlLiopDesc* |
| #define VL_QSORT_cmp patch_cmp |
| #define VL_QSORT_cmp neigh_cmp |
| #define VL_QSORT_prefix patch |
| #define VL_QSORT_prefix neigh |
| #define VL_QSORT_swap patch_swap |
| #define VL_QSORT_swap neigh_swap |
Function Documentation
| VL_INLINE vl_index get_permutation_index | ( | vl_uindex * | permutation, |
| vl_size | size | ||
| ) |
| VL_INLINE float neigh_cmp | ( | VlLiopDesc * | liop, |
| vl_index | i, | ||
| vl_index | j | ||
| ) |
| VL_INLINE void neigh_swap | ( | VlLiopDesc * | liop, |
| vl_index | i, | ||
| vl_index | j | ||
| ) |
| VL_INLINE float patch_cmp | ( | VlLiopDesc * | liop, |
| vl_index | i, | ||
| vl_index | j | ||
| ) |
| VL_INLINE void patch_swap | ( | VlLiopDesc * | liop, |
| vl_index | i, | ||
| vl_index | j | ||
| ) |
| void vl_liopdesc_delete | ( | VlLiopDesc * | self | ) |
| vl_size vl_liopdesc_get_dimension | ( | VlLiopDesc const * | self | ) |
| float vl_liopdesc_get_intensity_threshold | ( | VlLiopDesc const * | self | ) |
| double vl_liopdesc_get_neighbourhood_radius | ( | VlLiopDesc const * | self | ) |
| vl_size vl_liopdesc_get_num_neighbours | ( | VlLiopDesc const * | self | ) |
| vl_size vl_liopdesc_get_num_spatial_bins | ( | VlLiopDesc const * | self | ) |
| VlLiopDesc* vl_liopdesc_new | ( | vl_int | numNeighbours, |
| vl_int | numSpatialBins, | ||
| float | radius, | ||
| vl_size | sideLength | ||
| ) |
Create a new LIOP object instance.
- Parameters:
-
numNeighbours number of neighbours. numSpatialBins number of bins. radius radius of the cirucal sample neighbourhoods. sideLength width of the input image patch (the patch is square).
- Returns:
- new object instance.
The value of radius should be at least less than half the sideLength of the patch.
| VlLiopDesc* vl_liopdesc_new_basic | ( | vl_size | sideLength | ) |
Create a new object with default parameters.
- Parameters:
-
sideLength size of the patches to be processed.
- Returns:
- new object.
- See also:
- vl_liopdesc_new.
| void vl_liopdesc_process | ( | VlLiopDesc * | self, |
| float * | desc, | ||
| float const * | patch | ||
| ) |
Compute liop descriptor for a patch.
- Parameters:
-
self object instance desc descriptor to be computed (output). patch patch to process
Use vl_liopdesc_get_dimension to get the size of the descriptor desc.
| void vl_liopdesc_set_intensity_threshold | ( | VlLiopDesc * | self, |
| float | x | ||
| ) |
Set the intensity threshold.
- Parameters:
-
self object. x intensity threshold.
If non-negative, the threshold as is is used when comparing intensities. If negative, the absolute value of the specified number is multipled by the maximum intensity difference inside a patch to obtain the threshold.
- See also:
- liop-weighing