The Chi2 kernel operating on realvalued vectors computes the chi-squared distance between sets of histograms.
It is a very useful distance in image recognition (used to detect objects).
It is defined as
Definition at line 32 of file Chi2Kernel.h.
Public Member Functions | |
CChi2Kernel (void) | |
CChi2Kernel (int32_t size, float64_t width) | |
CChi2Kernel (CSimpleFeatures< float64_t > *l, CSimpleFeatures< float64_t > *r, float64_t width, int32_t size) | |
virtual | ~CChi2Kernel () |
virtual bool | init (CFeatures *l, CFeatures *r) |
virtual EKernelType | get_kernel_type () |
virtual EFeatureClass | get_feature_class () |
virtual EFeatureType | get_feature_type () |
virtual const char * | get_name () const |
Protected Member Functions | |
virtual float64_t | compute (int32_t idx_a, int32_t idx_b) |
Protected Attributes | |
float64_t | width |
CChi2Kernel | ( | void | ) |
default constructor
Definition at line 25 of file Chi2Kernel.cpp.
CChi2Kernel | ( | int32_t | size, | |
float64_t | width | |||
) |
CChi2Kernel | ( | CSimpleFeatures< float64_t > * | l, | |
CSimpleFeatures< float64_t > * | r, | |||
float64_t | width, | |||
int32_t | size | |||
) |
constructor
l | features of left-hand side | |
r | features of right-hand side | |
width | width | |
size | cache size |
Definition at line 37 of file Chi2Kernel.cpp.
~CChi2Kernel | ( | ) | [virtual] |
Definition at line 45 of file Chi2Kernel.cpp.
float64_t compute | ( | int32_t | idx_a, | |
int32_t | idx_b | |||
) | [protected, virtual] |
compute kernel function for features a and b idx_{a,b} denote the index of the feature vectors in the corresponding feature object
idx_a | index a | |
idx_b | index b |
Reimplemented from CDotKernel.
Definition at line 57 of file Chi2Kernel.cpp.
virtual EFeatureClass get_feature_class | ( | ) | [virtual] |
return feature class the kernel can deal with
Reimplemented from CDotKernel.
Definition at line 77 of file Chi2Kernel.h.
virtual EFeatureType get_feature_type | ( | ) | [virtual] |
return feature type the kernel can deal with
Reimplemented from CDotKernel.
Definition at line 83 of file Chi2Kernel.h.
virtual EKernelType get_kernel_type | ( | ) | [virtual] |
return what type of kernel we are
Implements CDotKernel.
Definition at line 71 of file Chi2Kernel.h.
virtual const char* get_name | ( | void | ) | const [virtual] |
return the kernel's name
Reimplemented from CDotKernel.
Definition at line 89 of file Chi2Kernel.h.
initialize kernel
l | features of left-hand side | |
r | features of right-hand side |
Reimplemented from CDotKernel.
Definition at line 50 of file Chi2Kernel.cpp.
width
Definition at line 104 of file Chi2Kernel.h.