From e320e069844b8f9c6e5d7e4e407cc90dff3b0f04 Mon Sep 17 00:00:00 2001 From: Nick White Date: Wed, 26 Feb 2020 16:53:14 +0000 Subject: Move things around so that integralimg is in its own repository --- cmd/preproc/main.go | 94 ----------------------------------------------------- 1 file changed, 94 deletions(-) delete mode 100644 cmd/preproc/main.go (limited to 'cmd/preproc') diff --git a/cmd/preproc/main.go b/cmd/preproc/main.go deleted file mode 100644 index 3323635..0000000 --- a/cmd/preproc/main.go +++ /dev/null @@ -1,94 +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 main - -// TODO: come up with a way to set a good ksize automatically - -import ( - "flag" - "fmt" - "image" - "image/draw" - _ "image/jpeg" - "image/png" - "log" - "os" - - "rescribe.xyz/preproc" -) - -// TODO: do more testing to see how good this assumption is -func autowsize(bounds image.Rectangle) int { - return bounds.Dx() / 60 -} - -func main() { - flag.Usage = func() { - fmt.Fprintf(os.Stderr, "Usage: preproc [-bt bintype] [-bw winsize] [-k num] [-m minperc] [-nowipe] [-wt wipethresh] [-ws wipesize] inimg outimg\n") - fmt.Fprintf(os.Stderr, "Binarize and preprocess an image\n") - flag.PrintDefaults() - } - binwsize := flag.Int("bw", 0, "Window size for sauvola binarization algorithm. Set automatically based on resolution if not set.") - ksize := flag.Float64("k", 0.5, "K for sauvola binarization algorithm. This controls the overall threshold level. Set it lower for very light text (try 0.1 or 0.2).") - btype := flag.String("bt", "binary", "Type of binarization threshold. binary or zeroinv are currently implemented.") - min := flag.Int("m", 30, "Minimum percentage of the image width for the content width calculation to be considered valid.") - nowipe := flag.Bool("nowipe", false, "Disable wiping completely.") - wipewsize := flag.Int("ws", 5, "Window size for wiping algorithm.") - thresh := flag.Float64("wt", 0.05, "Threshold for the wiping algorithm to determine 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) - - if *binwsize == 0 { - *binwsize = autowsize(b) - } - - if *binwsize%2 == 0 { - *binwsize++ - } - - log.Print("Binarising") - var clean, threshimg image.Image - threshimg = preproc.IntegralSauvola(gray, *ksize, *binwsize) - - if *btype == "zeroinv" { - threshimg, err = preproc.BinToZeroInv(threshimg.(*image.Gray), img.(*image.RGBA)) - if err != nil { - log.Fatal(err) - } - } - - if !*nowipe { - log.Print("Wiping sides") - clean = preproc.Wipe(threshimg.(*image.Gray), *wipewsize, *thresh, *min) - } else { - clean = threshimg - } - - 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) - } -} -- cgit v1.2.1-24-ge1ad