Gabor#

class zrad.filtering.spatial.Gabor(padding_type: str, res_mm: float, sigma_mm: float, lambda_mm: float, gamma: float, theta: float, rotation_invariance: bool = False, orthogonal_planes: bool = False, n_stds: float = None)[source]#

Gabor filtering with complex 2D kernels.

Gabor filters measure oriented, frequency-selective texture. The implementation applies real and imaginary kernels slice-wise, returns their magnitude, and can average responses over orientations and orthogonal planes.

Parameters:

  • padding_type ({"constant", "nearest", "reflect", "mirror", "wrap"}) – Boundary handling mode used by OpenCV.

  • res_mm (float) – Voxel spacing in millimetres used to convert physical scales to pixels.

  • sigma_mm (float) – Gaussian envelope standard deviation in millimetres.

  • lambda_mm (float) – Sinusoidal wavelength in millimetres.

  • gamma (float) – Spatial aspect ratio of the Gabor kernel.

  • theta (float) – Orientation angle in radians, or angular step when rotation_invariance is true.

  • rotation_invariance (bool, optional) – If true, average responses over orientations from 0 to 2*pi.

  • orthogonal_planes (bool, optional) – If true, also evaluate the three orthogonal slice planes.

  • n_stds (float or None, optional) – Kernel size in standard deviations. If None, seven standard deviations are used.

Methods

apply(image)

Apply the filter to an image or set RoiData.filtered_image.

get_params()

Return filter parameters mapped to their configured values.
Gabor.apply(image)#

Apply the filter to an image or set RoiData.filtered_image.

Parameters:

image (Image or RoiData) – Input image to filter. If RoiData is supplied, filtering is applied to image.image and the result is stored as filtered_image in the returned ROI data. Existing intensity, texture, and IVH prepared fields are cleared.

Returns:

filtered – Filtered image, or ROI data with filtered_image updated.

Return type:

Image or RoiData

Gabor.get_params()#

Return filter parameters mapped to their configured values.

Returns:

params – Constructor parameters stored by the filter instance.

Return type:

dict