blind_watermark

func AddWatermark(img image.Image, wm []byte) (image.Image, error)

func Dct2(x [][]float64) [][]float64

func Dwt2(src [][]float64) (aa [][]float64, ad [][]float64, da [][]float64, dd [][]float64)

func EmbedWm(src [][][][]float64, wm []uint8) [][][][]float64

func ExtractWaterMask(img image.Image) ([]byte, error)

func ExtractWm(src [][]float64) ([]uint8, error)

func FloatToUint8(f float64) uint8

func Idct2(x [][]float64) [][]float64

func Idwt2(aa [][]float64, ad [][]float64, da [][]float64, dd [][]float64) (dst [][]float64)

func RestoreSourceData(blocks [][][][]float64) (src [][]float64)

func SwitchToBlocks(src [][]float64) (blocks [][][][]float64)