diff options
Diffstat (limited to 'sauvola.go')
| -rw-r--r-- | sauvola.go | 12 |
1 files changed, 6 insertions, 6 deletions
@@ -10,7 +10,7 @@ import ( "image/draw" "math" - "rescribe.xyz/integralimg" + "rescribe.xyz/integral" ) // Implements Sauvola's algorithm for text binarization, see paper @@ -44,16 +44,16 @@ func Sauvola(img image.Image, ksize float64, windowsize int) *image.Gray { func IntegralSauvola(img image.Image, ksize float64, windowsize int) *image.Gray { b := img.Bounds() - intImg := integralimg.NewImage(b) + intImg := integral.NewImage(b) draw.Draw(intImg, b, img, b.Min, draw.Src) - intSqImg := integralimg.NewSqImage(b) + intSqImg := integral.NewSqImage(b) draw.Draw(intSqImg, b, img, b.Min, draw.Src) return PreCalcedSauvola(*intImg, *intSqImg, img, ksize, windowsize) } // PreCalcedSauvola Implements Sauvola's algorithm using precalculated Integral Images -func PreCalcedSauvola(intImg integralimg.Image, intSqImg integralimg.SqImage, img image.Image, ksize float64, windowsize int) *image.Gray { +func PreCalcedSauvola(intImg integral.Image, intSqImg integral.SqImage, img image.Image, ksize float64, windowsize int) *image.Gray { b := img.Bounds() gray := image.NewGray(b) draw.Draw(gray, b, img, b.Min, draw.Src) @@ -62,8 +62,8 @@ func PreCalcedSauvola(intImg integralimg.Image, intSqImg integralimg.SqImage, im for y := b.Min.Y; y < b.Max.Y; y++ { for x := b.Min.X; x < b.Max.X; x++ { r := centeredRectangle(x, y, windowsize) - m, dev := integralimg.MeanStdDev(intImg, intSqImg, r) - // Divide by 255 to adjust from Gray16 used by integralimg to 8 bit Gray + m, dev := integral.MeanStdDev(intImg, intSqImg, r) + // Divide by 255 to adjust from Gray16 used by integral.Image to 8 bit Gray m8 := m / 255 dev8 := dev / 255 threshold := m8 * (1 + ksize*((dev8/128)-1)) |