Namespace descr

Index

Functions

Functions

Const makeFourierDescriptorFromPolygon

makeFourierDescriptorFromPolygon(contour: Point[], harmonics?: number): Tensor<Rank>

- Defined in shape_descriptors/fourier_descriptors/fourier_descriptors_phase.ts:23
Compute the Fourier Descriptor of a polygon. Implements Kuhl and Giardina method of computing the coefficients for a specified number of harmonics. See the original paper for more detail: Kuhl, FP and Giardina, CR (1982). Elliptic Fourier features of a closed contour. Computer graphics and image processing, 18(3), 236-258. Or see W. Burger Digital Image Processing An Algorithmic Introduction - p. 682

Parameters
- contour: Point[]
  
  Array with x and y coordinates of contour line
- harmonics: number = 40
  
  The number of harmonics to compute for the given shape
Returns Tensor<Rank>

complex valued Fourier descriptors

Const normalizeFourierDescriptor

normalizeFourierDescriptor(descriptor: Tensor<Rank>): Tensor<Rank>

- Defined in shape_descriptors/fourier_descriptors/fourier_descriptors_phase.ts:77
Normalizes Fourier Descriptor and concatenates imaginary and real values of phase shifted descriptors G_a and G_b

Parameters
- descriptor: Tensor<Rank>
  
  Unnormalized Fourier Descriptor
Returns Tensor<Rank>

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