transforms

Documentation

Index

• func DCT1D(input []float64) []float64
• func DCT1DFast64(input []float64)
• func DCT2D(input [][]float64, w int, h int) [][]float64
• func DCT2DFast64(input *[]float64)
• func FlattenPixels(pixels [][]float64, x int, y int) []float64
• func FlattenPixelsFast64(pixels []float64, x int, y int) []float64
• func Rgb2Gray(colorImg image.Image) [][]float64
• func Rgb2GrayFast(colorImg image.Image, pixels *[]float64)

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 DCT1DFast64

func DCT1DFast64(input []float64)

DCT1DFast64 function returns result of DCT-II. DCT type II, unscaled. Algorithm by Byeong Gi Lee, 1984. Static implementation by Evan Oberholster, 2022.

func DCT2D

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

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

func DCT2DFast64

func DCT2DFast64(input *[]float64)

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

func FlattenPixels

func FlattenPixels(pixels [][]float64, x int, y int) []float64

FlattenPixels function flattens 2d array into 1d array.

func FlattenPixelsFast64

func FlattenPixelsFast64(pixels []float64, x int, y int) []float64

FlattenPixelsFast64 function flattens 2d array into 1d array.

func Rgb2Gray

func Rgb2Gray(colorImg image.Image) [][]float64

Rgb2Gray function converts RGB to a gray scale array.

func Rgb2GrayFast

func Rgb2GrayFast(colorImg image.Image, pixels *[]float64)

Rgb2GrayFast function converts RGB to a gray scale array.