详细描述
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
![\[ k({\bf x},({\bf x'})= e^{-\frac{1}{width} \sum_{i=0}^{l}\frac{(x_i-x'_i)^2}{(x_i+x'_i)}} \]](form_76.png)
在文件Chi2Kernel.h第32行定义。
继承图，类CChi2Kernel
公有成员 | |
| 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 const char * | get_name () const |
保护成员 | |
| virtual float64_t | compute (int32_t idx_a, int32_t idx_b) |
保护属性 | |
| float64_t | width |
构造及析构函数文档
| CChi2Kernel | ( | int32_t | size, | |
| float64_t | width | |||
| ) |
| CChi2Kernel | ( | CSimpleFeatures< float64_t > * | l, | |
| CSimpleFeatures< float64_t > * | r, | |||
| float64_t | width, | |||
| int32_t | size | |||
| ) |
constructor
- 参数:
-
l features of left-hand side r features of right-hand side width width size cache size
在文件Chi2Kernel.cpp第24行定义。
| ~CChi2Kernel | ( | ) | [virtual] |
在文件Chi2Kernel.cpp第31行定义。
成员函数文档
| 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
- 参数:
-
idx_a index a idx_b index b
- 返回:
- computed kernel function at indices a,b
实现了CKernel。
在文件Chi2Kernel.cpp第43行定义。
| virtual EKernelType get_kernel_type | ( | ) | [virtual] |
| virtual const char* get_name | ( | ) | const [virtual] |
initialize kernel
- 参数:
-
l features of left-hand side r features of right-hand side
- 返回:
- if initializing was successful
在文件Chi2Kernel.cpp第36行定义。
成员数据文档
width
在文件Chi2Kernel.h第87行定义。
该类的文档由以下文件生成：