perspective

Documentation

Overview

Package perspective is used for creating and applying perspective transforms with the help of two quadrilaterals. A perspective transform can be used to map each point of one quadrilateral to another, given the corner coordinates for the source and destination quadrilaterals.

Index

• type Perspective
  • func New(srcPoints, dstPoints [8]float64) *Perspective
  • func (t *Perspective) Transform(sx, sy float64) (dx, dy float64)
  • func (t *Perspective) TransformInv(sx, sy float64) (dx, dy float64)

Types

type Perspective

type Perspective struct {
	// SrcPoints is an array of the corner coordinates of the source
	// quadrilateral.
	SrcPoints [8]float64
	// DstPoints is an array of the corner coordinates of the destination
	// quadrilateral.
	DstPoints [8]float64
	// Coeffs is a homographic transform matrix, expressed as an array of
	// coefficients.
	Coeffs [9]float64
	// CoeffsInv is an inverse homographic transform matrix, expressed as an
	// array of coefficients.
	CoeffsInv [9]float64
}

func New

func New(srcPoints, dstPoints [8]float64) *Perspective

New takes the corner coordinates of the source and destination quadrilaterals in a [x1, y1, x2, y2, x3, y3, x4, y4] form.

func (*Perspective) Transform

func (t *Perspective) Transform(sx, sy float64) (dx, dy float64)

Transform maps a point from the source quadrilateral to the destination quadrilateral.

func (*Perspective) TransformInv

func (t *Perspective) TransformInv(sx, sy float64) (dx, dy float64)

TransformInv maps a point from the destination quadrilateral to the source quadrilateral.