transforms

Documentation

Index

• Variables
• func DCT1D(input []float64) []float64
• func DCT2D(input [][]float64, w int, h int) [][]float64
• func DCT2DFast256(input *[]float64) (flattens [256]float64)
• func DCT2DFast32(input *[]float64) (flattens [64]float64)
• func DCT2DFast64(input *[]float64) (flattens [64]float64)
• func Rgb2Gray(colorImg image.Image, pixels []uint8) []uint8

Variables

var FastYCBCR = true

Functions

func DCT1D

func DCT1D(input []float64) []float64

DCT1D function returns result of DCT-II. DCT type II, unscaled. Algorithm by Byeong Gi Lee, 1984.

func DCT2D

func DCT2D(input [][]float64, w int, h int) [][]float64

DCT2D function returns a result of DCT2D by using the separable property.

func DCT2DFast256

func DCT2DFast256(input *[]float64) (flattens [256]float64)

DCT2DFast256 function returns a result of DCT2D by using the separable property. DCT type II, unscaled. Algorithm by Byeong Gi Lee, 1984. Fast uses static DCT tables for improved performance. Returns flattened pixels.

func DCT2DFast32

func DCT2DFast32(input *[]float64) (flattens [64]float64)

func DCT2DFast64

func DCT2DFast64(input *[]float64) (flattens [64]float64)

DCT2DFast64 function returns a result of DCT2D by using the separable property. Fast uses static DCT tables for improved performance. Returns flattened pixels.

func Rgb2Gray

func Rgb2Gray(colorImg image.Image, pixels []uint8) []uint8

Rgb2Gray function converts RGB to a gray scale array.