edge

Documentation

Index

• func Canny(dst *image.Gray, src image.Image) error
• func DifferenceOfGaussians(dst *image.Gray, src image.Image, sd0, sd1 float64)
• func LaplacianOfGaussian(dst *image.Gray, src image.Image)
• func Prewitt(mag, dir *image.Gray, src image.Image) error
• func Scharr(mag, dir *image.Gray, src image.Image) error
• func Sobel(mag, dir *image.Gray, src image.Image) error

Functions

func Canny

func Canny(dst *image.Gray, src image.Image) error

Canny detects and returns edges from the given image. Each dst pixel is given one of three values:

0xff: an edge
0x80: possibly an edge
0x00: not an edge

func DifferenceOfGaussians

func DifferenceOfGaussians(dst *image.Gray, src image.Image, sd0, sd1 float64)

DifferenceOfGaussians produces the difference of Gaussians sd0 and sd1.

func LaplacianOfGaussian

func LaplacianOfGaussian(dst *image.Gray, src image.Image)

LaplacianOfGaussian approximates a 2D laplacian of gaussian with a convolution kernel.

func Prewitt

func Prewitt(mag, dir *image.Gray, src image.Image) error

Prewitt returns the magnitude and direction of the Prewitt operator.

func Scharr

func Scharr(mag, dir *image.Gray, src image.Image) error

Scharr returns the magnitude and direction of the Scharr operator. This is very similar to Sobel, with less angular error.

func Sobel

func Sobel(mag, dir *image.Gray, src image.Image) error

Sobel returns the magnitude and direction of the Sobel operator. dir pixels hold the rounded direction value either 0, 45, 90, or 135.