jp.nyatla.nyartoolkit.base.attoolkit5.kpm.vision.math

クラス math_utils

java.lang.Object

jp.nyatla.nyartoolkit.base.attoolkit5.kpm.vision.math.math_utils

public class math_utils
extends java.lang.Object

このクラスは一時的なものです。

作成者:

nyatla

フィールドの概要

フィールド

修飾子とタイプ	フィールドと説明
static double	ONE_OVER_2PI
static double	PI
static double	SQRT2

コンストラクタの概要

コンストラクタ

コンストラクタと説明
math_utils()

メソッドの概要

メソッド

修飾子とタイプ	メソッドと説明
static double	fastexp6(double x) 0.01% error at 1.030 0.10% error at 1.520 1.00% error at 2.330 5.00% error at 3.285
static double	log2(double x) Base 2 log
static double	max2(double a, double b)
static int	max2(int a, int b)
static double	min2(double a, double b)
static int	min2(int a, int b)
static void	MultiplyPointSimilarityInhomogenous(double[] xp, int idx, double[] H, double[] x, int idx2) Multiply an in-homogenous point by a similarity.
static boolean	Quadratic3Points(double[] r, double[] p1, double[] p2, double[] p3) Fit a quatratic to 3 points.
static boolean	QuadraticCriticalPoint(double[] x, double A, double B, double C) Find the critical point of a quadratic.
static double	QuadraticEval(double[] r, double x) Evaluate a quatratic function.
static double	round(double x)
static void	Similarity(double[] H, double x, double y, double angle, double scale) Create a similarity matrix.
static double	sqr(double x)
static void	ZeroVector(double[] x, int num_elements)

クラスから継承されたメソッド java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

フィールドの詳細

PI

public static final double PI

関連項目:

定数フィールド値

ONE_OVER_2PI

public static final double ONE_OVER_2PI

関連項目:

定数フィールド値

SQRT2

public static final double SQRT2

関連項目:

定数フィールド値

コンストラクタの詳細

math_utils

public math_utils()

メソッドの詳細

sqr

public static final double sqr(double x)

戻り値:

x*x

round

public static final double round(double x)

戻り値:

nearest rounding of x

log2

public static final double log2(double x)

Base 2 log

max2

public static final double max2(double a,
          double b)

max2

public static final int max2(int a,
       int b)

min2

public static final double min2(double a,
          double b)

min2

public static final int min2(int a,
       int b)

ZeroVector

public static final void ZeroVector(double[] x,
              int num_elements)

fastexp6

public static final double fastexp6(double x)

0.01% error at 1.030 0.10% error at 1.520 1.00% error at 2.330 5.00% error at 3.285

Quadratic3Points

public static boolean Quadratic3Points(double[] r,
                       double[] p1,
                       double[] p2,
                       double[] p3)

Fit a quatratic to 3 points. The system of equations is: y0 = A*x0^2 + B*x0 + C y1 = A*x1^2 + B*x1 + C y2 = A*x2^2 + B*x2 + C This system of equations is solved for A,B,C.

戻り値:

True if the quatratic could be fit, otherwise false.

QuadraticEval

public static final double QuadraticEval(double[] r,
                   double x)

Evaluate a quatratic function.

QuadraticCriticalPoint

public static final boolean QuadraticCriticalPoint(double[] x,
                             double A,
                             double B,
                             double C)

Find the critical point of a quadratic. y = A*x^2 + B*x + C This function finds where "x" where dy/dx = 0.

戻り値:

True on success.

Similarity

public static void Similarity(double[] H,
              double x,
              double y,
              double angle,
              double scale)

Create a similarity matrix.

MultiplyPointSimilarityInhomogenous

public static void MultiplyPointSimilarityInhomogenous(double[] xp,
                                       int idx,
                                       double[] H,
                                       double[] x,
                                       int idx2)

Multiply an in-homogenous point by a similarity.