Module hog

HoG features and helpers for visualizing them.

Structs

Array3d

A 3d array that owns its data.

HogOptions

Parameters for HoG descriptors.

HogSpec

HoG options plus values calculated from these options and the desired image dimensions. Validation must occur when instances of this struct are created - functions receiving a spec will assume that it is valid.

View3d

A view into a 3d array.

Functions

cell_histograms

Computes orientation histograms for each cell of an image. Assumes that the provided dimensions are valid.

hog

Computes the HoG descriptor of an image, or None if the provided options are incompatible with the image size.

render_hist_grid

Visualises an array of orientation histograms. The dimensions of the provided Array3d are orientation bucket, horizontal location of the cell, then vertical location of the cell. Note that we ignore block-level aggregation or normalisation here. Each rendered star has side length star_side, so the image will have width grid.lengths[1] * star_side and height grid.lengths[2] * star_side.