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/integralimg.go | 116 ------------------------------------------------
 1 file changed, 116 deletions(-)
 delete mode 100644 binarize/integralimg.go

(limited to 'binarize/integralimg.go')

diff --git a/binarize/integralimg.go b/binarize/integralimg.go
deleted file mode 100644
index 382b495..0000000
--- a/binarize/integralimg.go
+++ /dev/null
@@ -1,116 +0,0 @@
-package binarize
-
-import (
-	"image"
-	"math"
-)
-
-type integralwindow struct {
-	topleft uint64
-	topright uint64
-	bottomleft uint64
-	bottomright uint64
-	width int
-	height int
-}
-
-func Integralimg(img *image.Gray) [][]uint64 {
-	b := img.Bounds()
-	var oldy, oldx, oldxy uint64
-	var integral [][]uint64
-	for y := b.Min.Y; y < b.Max.Y; y++ {
-		newrow := []uint64{}
-		for x := b.Min.X; x < b.Max.X; x++ {
-			oldx, oldy, oldxy = 0, 0, 0
-			if x > 0 {
-				oldx = newrow[x-1]
-			}
-			if y > 0 {
-				oldy = integral[y-1][x]
-			}
-			if x > 0 && y > 0 {
-				oldxy = integral[y-1][x-1]
-			}
-			pixel := uint64(img.GrayAt(x, y).Y)
-			i := pixel + oldx + oldy - oldxy
-			newrow = append(newrow, i)
-		}
-		integral = append(integral, newrow)
-	}
-	return integral
-}
-
-func integralimgsq(img *image.Gray) [][]uint64 {
-	b := img.Bounds()
-	var oldy, oldx, oldxy uint64
-	var integral [][]uint64
-	for y := b.Min.Y; y < b.Max.Y; y++ {
-		newrow := []uint64{}
-		for x := b.Min.X; x < b.Max.X; x++ {
-			oldx, oldy, oldxy = 0, 0, 0
-			if x > 0 {
-				oldx = newrow[x-1]
-			}
-			if y > 0 {
-				oldy = integral[y-1][x]
-			}
-			if x > 0 && y > 0 {
-				oldxy = integral[y-1][x-1]
-			}
-			pixel := uint64(img.GrayAt(x, y).Y)
-			i := pixel * pixel + oldx + oldy - oldxy
-			newrow = append(newrow, i)
-		}
-		integral = append(integral, newrow)
-	}
-	return integral
-}
-
-// this gets the values of the four corners of a window, which can
-// be used to quickly calculate the mean of the area
-func getintegralwindow(integral [][]uint64, x int, y int, size int) integralwindow {
-	step := size / 2
-
-	minx, miny := 0, 0
-	maxy := len(integral)-1
-	maxx := len(integral[0])-1
-
-	if y > (step+1) {
-		miny = y - step - 1
-	}
-	if x > (step+1) {
-		minx = x - step - 1
-	}
-
-	if maxy > (y + step) {
-		maxy = y + step
-	}
-	if maxx > (x + step) {
-		maxx = x + step
-	}
-
-	return integralwindow { integral[miny][minx], integral[miny][maxx], integral[maxy][minx], integral[maxy][maxx], maxx-minx, maxy-miny}
-}
-
-func integralmean(integral [][]uint64, x int, y int, size int) float64 {
-	i := getintegralwindow(integral, x, y, size)
-	total := float64(i.bottomright + i.topleft - i.topright - i.bottomleft)
-	sqsize := float64(i.width) * float64(i.height)
-	return total / sqsize
-}
-
-func integralmeanstddev(integral [][]uint64, integralsq [][]uint64, x int, y int, size int) (float64, float64) {
-	i := getintegralwindow(integral, x, y, size)
-	isq := getintegralwindow(integralsq, x, y, size)
-
-	var total, sqtotal, sqsize float64
-
-	sqsize = float64(i.width) * float64(i.height)
-
-	total = float64(i.bottomright + i.topleft - i.topright - i.bottomleft)
-	sqtotal = float64(isq.bottomright + isq.topleft - isq.topright - isq.bottomleft)
-
-	mean := total / sqsize
-	variance := (sqtotal / sqsize) - (mean * mean)
-	return mean, math.Sqrt(variance)
-}
-- 
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