From 6b7cc0cd671db9c8ff89eea1686099c48dba412a Mon Sep 17 00:00:00 2001
From: Nick White <git@njw.name>
Date: Mon, 13 May 2019 17:28:38 +0100
Subject: Make cleanup a basic library

---
 cleanup/main.go | 175 --------------------------------------------------------
 1 file changed, 175 deletions(-)
 delete mode 100644 cleanup/main.go

(limited to 'cleanup/main.go')

diff --git a/cleanup/main.go b/cleanup/main.go
deleted file mode 100644
index fdec6e9..0000000
--- a/cleanup/main.go
+++ /dev/null
@@ -1,175 +0,0 @@
-package main
-
-// TODO: add minimum size variable (default ~30%?)
-// TODO: make into a small library
-// TODO: have the integral image specific stuff done by interface functions
-
-import (
-	"flag"
-	"fmt"
-	"image"
-	"image/color"
-	"image/draw"
-	_ "image/jpeg"
-	"image/png"
-	"log"
-	"os"
-
-	"rescribe.xyz/go.git/binarize"
-)
-
-type windowslice struct {
-	topleft     uint64
-	topright    uint64
-	bottomleft  uint64
-	bottomright uint64
-}
-
-func getwindowslice(i [][]uint64, x int, size int) windowslice {
-	maxy := len(i) - 1
-	maxx := x + size
-	if maxx > len(i[0])-1 {
-		maxx = len(i[0]) - 1
-	}
-
-	return windowslice{i[0][x], i[0][maxx], i[maxy][x], i[maxy][maxx]}
-}
-
-// checkwindow checks the window from x to see whether more than
-// thresh proportion of the pixels are white, if so it returns true.
-func checkwindow(integral [][]uint64, x int, size int, thresh float64) bool {
-	height := len(integral)
-	window := getwindowslice(integral, x, size)
-	// divide by 255 as each on pixel has the value of 255
-	sum := (window.bottomright + window.topleft - window.topright - window.bottomleft) / 255
-	area := size * height
-	proportion := float64(area)/float64(sum) - 1
-	return proportion <= thresh
-}
-
-// returns the proportion of the given window that is black pixels
-func proportion(integral [][]uint64, x int, size int) float64 {
-	height := len(integral)
-	window := getwindowslice(integral, x, size)
-	// divide by 255 as each on pixel has the value of 255
-	sum := (window.bottomright + window.topleft - window.topright - window.bottomleft) / 255
-	area := size * height
-	return float64(area)/float64(sum) - 1
-}
-
-// wipesides fills the sections of image not within the boundaries
-// of lowedge and highedge with white
-func wipesides(img *image.Gray, lowedge int, highedge int) *image.Gray {
-	b := img.Bounds()
-	new := image.NewGray(b)
-
-	// set left edge white
-	for x := b.Min.X; x < lowedge; x++ {
-		for y := b.Min.Y; y < b.Max.Y; y++ {
-			new.SetGray(x, y, color.Gray{255})
-		}
-	}
-	// copy middle
-	for x := lowedge; x < highedge; x++ {
-		for y := b.Min.Y; y < b.Max.Y; y++ {
-			new.SetGray(x, y, img.GrayAt(x, y))
-		}
-	}
-	// set right edge white
-	for x := highedge; x < b.Max.X; x++ {
-		for y := b.Min.Y; y < b.Max.Y; y++ {
-			new.SetGray(x, y, color.Gray{255})
-		}
-	}
-
-	return new
-}
-
-// findbestedge goes through every vertical line from x to x+w to
-// find the one with the lowest proportion of black pixels.
-func findbestedge(integral [][]uint64, x int, w int) int {
-	var bestx int
-	var best float64
-
-	if w == 1 {
-		return x
-	}
-
-	right := x + w
-	for ; x < right; x++ {
-		prop := proportion(integral, x, 1)
-		if prop > best {
-			best = prop
-			bestx = x
-		}
-	}
-
-	return bestx
-}
-
-// findedges finds the edges of the main content, by moving a window of wsize
-// from the middle of the image to the left and right, stopping when it reaches
-// a point at which there is a lower proportion of black pixels than thresh.
-func findedges(integral [][]uint64, wsize int, thresh float64) (int, int) {
-	maxx := len(integral[0]) - 1
-	var lowedge, highedge int = 0, maxx
-
-	for x := maxx / 2; x < maxx-wsize; x++ {
-		if checkwindow(integral, x, wsize, thresh) {
-			highedge = findbestedge(integral, x, wsize)
-			break
-		}
-	}
-
-	for x := maxx / 2; x > 0; x-- {
-		if checkwindow(integral, x, wsize, thresh) {
-			lowedge = findbestedge(integral, x, wsize)
-			break
-		}
-	}
-
-	return lowedge, highedge
-}
-
-func main() {
-	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage: cleanup [-t thresh] [-w winsize] inimg outimg\n")
-		flag.PrintDefaults()
-	}
-	wsize := flag.Int("w", 5, "Window size for mask finding algorithm.")
-	thresh := flag.Float64("t", 0.05, "Threshold for the proportion of black pixels below which a window is determined to be the edge.")
-	flag.Parse()
-	if flag.NArg() < 2 {
-		flag.Usage()
-		os.Exit(1)
-	}
-
-	f, err := os.Open(flag.Arg(0))
-	defer f.Close()
-	if err != nil {
-		log.Fatalf("Could not open file %s: %v\n", flag.Arg(0), err)
-	}
-	img, _, err := image.Decode(f)
-	if err != nil {
-		log.Fatalf("Could not decode image: %v\n", err)
-	}
-	b := img.Bounds()
-	gray := image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
-	draw.Draw(gray, b, img, b.Min, draw.Src)
-
-	integral := binarize.Integralimg(gray)
-
-	lowedge, highedge := findedges(integral, *wsize, *thresh)
-
-	clean := wipesides(gray, lowedge, highedge)
-
-	f, err = os.Create(flag.Arg(1))
-	if err != nil {
-		log.Fatalf("Could not create file %s: %v\n", flag.Arg(1), err)
-	}
-	defer f.Close()
-	err = png.Encode(f, clean)
-	if err != nil {
-		log.Fatalf("Could not encode image: %v\n", err)
-	}
-}
-- 
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