From 02a6c66eb77a5b455bcf2d0547d2383074eb7e41 Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Mon, 13 May 2019 19:23:03 +0100
Subject: Reorganise image manipulation to separate integral image parts

Also unify everything else under preproc/

Note that the UsefulImg interface should be used by the main
functions, to simplify things, but this hasn't been done yet.
---
 binarize/util.go | 87 --------------------------------------------------------
 1 file changed, 87 deletions(-)
 delete mode 100644 binarize/util.go

(limited to 'binarize/util.go')

diff --git a/binarize/util.go b/binarize/util.go
deleted file mode 100644
index ad641c9..0000000
--- a/binarize/util.go
+++ /dev/null
@@ -1,87 +0,0 @@
-package binarize
-
-import (
-	"errors"
-	"image"
-	"math"
-)
-
-func mean(i []int) float64 {
-	sum := 0
-	for _, n := range i {
-		sum += n
-	}
-	return float64(sum) / float64(len(i))
-}
-
-func stddev(i []int) float64 {
-	m := mean(i)
-
-	var sum float64
-	for _, n := range i {
-		sum += (float64(n) - m) * (float64(n) - m)
-	}
-	variance := sum / float64(len(i) - 1)
-	return math.Sqrt(variance)
-}
-
-func meanstddev(i []int) (float64, float64) {
-	m := mean(i)
-
-	var sum float64
-	for _, n := range i {
-		sum += (float64(n) - m) * (float64(n) - m)
-	}
-	variance := float64(sum) / float64(len(i) - 1)
-	return m, math.Sqrt(variance)
-}
-
-// gets the pixel values surrounding a point in the image
-func surrounding(img *image.Gray, x int, y int, size int) []int {
-	b := img.Bounds()
-	step := size / 2
-
-	miny := y - step
-	if miny < b.Min.Y {
-		miny = b.Min.Y
-	}
-	minx := x - step
-	if minx < b.Min.X {
-		minx = b.Min.X
-	}
-	maxy := y + step
-	if maxy > b.Max.Y {
-		maxy = b.Max.Y
-	}
-	maxx := x + step
-	if maxx > b.Max.X {
-		maxx = b.Max.X
-	}
-
-	var s []int
-	for yi := miny; yi <= maxy; yi++ {
-		for xi := minx; xi <= maxx; xi++ {
-			s = append(s, int(img.GrayAt(xi, yi).Y))
-		}
-	}
-	return s
-}
-
-func BinToZeroInv(bin *image.Gray, orig *image.RGBA) (*image.RGBA, error) {
-	b := bin.Bounds()
-	if ! b.Eq(orig.Bounds()) {
-		return orig, errors.New("bin and orig images need to be the same dimensions")
-	}
-	newimg := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
-	for y := b.Min.Y; y < b.Max.Y; y++ {
-		for x := b.Min.X; x < b.Max.X; x++ {
-			if bin.GrayAt(x, y).Y == 255 {
-				newimg.Set(x, y, bin.GrayAt(x, y))
-			} else {
-				newimg.Set(x, y, orig.At(x, y))
-			}
-		}
-	}
-
-	return newimg, nil
-}
-- 
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