Digital image processing and python implementation scikit image image feature (II)

List of articles

• • 7、Hessian The eigenvalues of a matrix
  • 8、 Directional gradient histogram (Histogram of Oriented Gradients ,HOG)
  • 9、 Local binary mode (Local Binary Patterns,LBP)
  • 10、 Feature tracing brute force matching
  • 11、 Template matching
  • 12、 Multi block local binary mode （Multi-block local binary pattern ）

7、Hessian The eigenvalues of a matrix

feature Modular hessian_matrix_eigvals Used to calculate Hessian The eigenvalues of a matrix . In the calculation Hessian Before the eigenvalue of the matrix , First, you need to convert the matrix into Hessian matrix .Hessian The form of the matrix is as follows ：

H = [Hrr Hrc]
[Hrc Hcc]

You can call hessian_matrix Function to implement .

function hessian_matrix_eigvals The prototype is as follows ：

skimage.feature.hessian_matrix_eigvals(H_elems)

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