libcamera::ipa::LscPolynomial Class Reference

Class for handling even polynomials used in lens shading correction. More...

Public Member Functions
	LscPolynomial (double cx=0.0, double cy=0.0, double k0=0.0, double k1=0.0, double k2=0.0, double k3=0.0, double k4=0.0)
	Construct a polynomial using the given coefficients. More...
double	sampleAtNormalizedPixelPos (double x, double y) const
	Sample the polynomial at the given normalized pixel position. More...
double	getM () const
	Get the value m as described in the dng specification. More...
void	setReferenceImageSize (const Size &size)
	Set the reference image size. More...

Detailed Description

Class for handling even polynomials used in lens shading correction.

Shading artifacts of camera lenses can be modeled using even radial polynomials. This class implements a polynomial with 5 coefficients which follows the definition of the FixVignetteRadial opcode in the Adobe DNG specification.

Constructor & Destructor Documentation

LscPolynomial()

libcamera::ipa::LscPolynomial::LscPolynomial ( double  cx = 0.0, double  cy = 0.0, double  k0 = 0.0, double  k1 = 0.0, double  k2 = 0.0, double  k3 = 0.0, double  k4 = 0.0  )

inline

Construct a polynomial using the given coefficients.

Parameters

cx	Center-x relative to the image in normalized coordinates (0..1)
cy	Center-y relative to the image in normalized coordinates (0..1)
k0	Coefficient of the polynomial
k1	Coefficient of the polynomial
k2	Coefficient of the polynomial
k3	Coefficient of the polynomial
k4	Coefficient of the polynomial

Member Function Documentation

getM()

libcamera::ipa::LscPolynomial::getM ( ) const

inline

Get the value m as described in the dng specification.

Returns m according to dng spec. m represents the Euclidean distance (in pixels) from the optical center to the farthest pixel in the image.

Returns

The sampled value

sampleAtNormalizedPixelPos()

libcamera::ipa::LscPolynomial::sampleAtNormalizedPixelPos ( double  x, double  y  ) const

inline

Sample the polynomial at the given normalized pixel position.

This functions samples the polynomial at the given pixel position divided by the value returned by getM().

Parameters

x	x position in normalized coordinates
y	y position in normalized coordinates

Returns

The sampled value

setReferenceImageSize()

libcamera::ipa::LscPolynomial::setReferenceImageSize ( const Size &  size )

inline

Set the reference image size.

Set the reference image size that is used for subsequent calls to getM() and sampleAtNormalizedPixelPos()

Parameters

size	The size of the reference image

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The documentation for this class was generated from the following files:

• src/ipa/libipa/lsc_polynomial.h
• src/ipa/libipa/lsc_polynomial.cpp