Point Spread Function

template<IsSpectral TSpectral>
class PSF

Abstract base class for point spread functions (PSF).

Defines the interface and cache management for all PSF types, supporting polyphase kernel generation.

Template Parameters:

TSpectral – The spectral representation type.

Subclassed by huira::AiryDisk< TSpectral >

Public Functions

PSF() = default

virtual ~PSF() = default

virtual TSpectral evaluate(float x, float y) = 0

void build_polyphase_cache(int radius, int banks)

Builds the polyphase kernel cache for the PSF.

Allocates and fills the cache with polyphase kernels for efficient PSF evaluation.

Parameters:

• radius – The kernel radius in pixels.

• banks – The number of polyphase banks.

const Image<TSpectral> &get_kernel(float u, float v) const

Retrieves the polyphase kernel for the given normalized coordinates.

Returns the cached kernel corresponding to the specified subpixel position.

Parameters:

• u – Normalized horizontal coordinate in [0, 1].

• v – Normalized vertical coordinate in [0, 1].

Returns:

Reference to the corresponding kernel image.

inline std::vector<Image<TSpectral>> get_all_kernels() const

inline int get_radius() const

inline int get_banks() const

Protected Attributes

struct huira::PSF::PolyphaseCache cache_

struct PolyphaseCache

Public Members

int radius = 0

int dim = 0

int banks = 0

std::vector<Image<TSpectral>> kernels