From 99b14d8b0d048de9a7aff1d3836a2d4373fc7cac Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Wed, 26 Feb 2020 16:55:03 +0000
Subject: Remove the integralimg package from here; it now has its own
 repository at rescribe.xyz/integralimg

---
 integralimg/integralimg.go | 173 ---------------------------------------------
 1 file changed, 173 deletions(-)
 delete mode 100644 integralimg/integralimg.go

(limited to 'integralimg')

diff --git a/integralimg/integralimg.go b/integralimg/integralimg.go
deleted file mode 100644
index 5cfbaf3..0000000
--- a/integralimg/integralimg.go
+++ /dev/null
@@ -1,173 +0,0 @@
-// Copyright 2019 Nick White.
-// Use of this source code is governed by the GPLv3
-// license that can be found in the LICENSE file.
-
-package integralimg
-
-import (
-	"image"
-	"math"
-)
-
-// I is the Integral Image
-type I [][]uint64
-
-// Sq contains an Integral Image and its Square
-type WithSq struct {
-	Img I
-	Sq I
-}
-
-// Window is a part of an Integral Image
-type Window struct {
-	topleft uint64
-	topright uint64
-	bottomleft uint64
-	bottomright uint64
-	width int
-	height int
-}
-
-// ToIntegralImg creates an integral image
-func ToIntegralImg(img *image.Gray) I {
-	var integral I
-	var oldy, oldx, oldxy uint64
-	b := img.Bounds()
-	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
-}
-
-// ToSqIntegralImg creates an integral image of the square of all
-// pixel values
-func ToSqIntegralImg(img *image.Gray) I {
-	var integral I
-	var oldy, oldx, oldxy uint64
-	b := img.Bounds()
-	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
-}
-
-// ToAllIntegralImg creates a WithSq containing a regular and
-// squared Integral Image
-func ToAllIntegralImg(img *image.Gray) WithSq {
-	var s WithSq
-	s.Img = ToIntegralImg(img)
-	s.Sq = ToSqIntegralImg(img)
-	return s
-}
-
-
-// GetWindow gets the values of the corners of a square part of an
-// Integral Image, plus the dimensions of the part, which can
-// be used to quickly calculate the mean of the area
-func (i I) GetWindow(x, y, size int) Window {
-	step := size / 2
-
-	minx, miny := 0, 0
-	maxy := len(i)-1
-	maxx := len(i[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 Window { i[miny][minx], i[miny][maxx], i[maxy][minx], i[maxy][maxx], maxx-minx, maxy-miny}
-}
-
-// GetVerticalWindow gets the values of the corners of a vertical
-// slice of an Integral Image, starting at x
-func (i I) GetVerticalWindow(x, width int) Window {
-	maxy := len(i) - 1
-	maxx := x + width
-	if maxx > len(i[0])-1 {
-		maxx = len(i[0]) - 1
-	}
-
-	return Window { i[0][x], i[0][maxx], i[maxy][x], i[maxy][maxx], width, maxy }
-}
-
-// Sum returns the sum of all pixels in a Window
-func (w Window) Sum() uint64 {
-	return w.bottomright + w.topleft - w.topright - w.bottomleft
-}
-
-// Size returns the total size of a Window
-func (w Window) Size() int {
-	return w.width * w.height
-}
-
-// Mean returns the average value of pixels in a Window
-func (w Window) Mean() float64 {
-	return float64(w.Sum()) / float64(w.Size())
-}
-
-// Proportion returns the proportion of pixels which are on
-func (w Window) Proportion() float64 {
-	area := w.width * w.height
-	// divide by 255 as each on pixel has the value of 255
-	sum := float64(w.Sum()) / 255
-	return float64(area) / sum - 1
-}
-
-// MeanWindow calculates the mean value of a section of an Integral
-// Image
-func (i I) MeanWindow(x, y, size int) float64 {
-	return i.GetWindow(x, y, size).Mean()
-}
-
-// MeanStdDevWindow calculates the mean and standard deviation of
-// a section on an Integral Image
-func (i WithSq) MeanStdDevWindow(x, y, size int) (float64, float64) {
-	imean := i.Img.GetWindow(x, y, size).Mean()
-	smean := i.Sq.GetWindow(x, y, size).Mean()
-
-	variance := smean - (imean * imean)
-
-	return imean, math.Sqrt(variance)
-}
-- 
cgit v1.2.1-24-ge1ad