From 6bb8ffba746fbcea8a8a359a32afdd591dab0f25 Mon Sep 17 00:00:00 2001 From: Nick White Date: Wed, 30 Jan 2019 16:42:02 +0000 Subject: Add integral image functionality to enable massive speedup of Sauvola Note that there are some very small differences to the output compared to the basic algorithm, but this doesn't make much difference. This is due to minor differences with the standard deviation calculation throughout, and with mean calculation at edges, for reasons I'm unclear about. WIP integral image speedup. mean is working Very WIP, but mean is perfect once full window is used Integral version all working! Remove debugging info Organise code better --- binarize/binarize.go | 40 ---------------------------------------- 1 file changed, 40 deletions(-) delete mode 100644 binarize/binarize.go (limited to 'binarize/binarize.go') diff --git a/binarize/binarize.go b/binarize/binarize.go deleted file mode 100644 index fa8a30f..0000000 --- a/binarize/binarize.go +++ /dev/null @@ -1,40 +0,0 @@ -package main - -import ( - "flag" - "fmt" - "log" - "os" - - "github.com/Ernyoke/Imger/imgio" -) - -func main() { - flag.Usage = func() { - fmt.Fprintf(os.Stderr, "Usage: binarize [-w num] [-k num] inimg outimg\n") - flag.PrintDefaults() - } - wsize := flag.Int("w", 31, "Window size for sauvola algorithm") - ksize := flag.Float64("k", 0.5, "K for sauvola algorithm") - flag.Parse() - if flag.NArg() < 2 { - flag.Usage() - os.Exit(1) - } - - img, err := imgio.ImreadGray(flag.Arg(0)) - if err != nil { - log.Fatalf("Could not read image %s\n", flag.Arg(0)) - } - - // TODO: should be able to estimate an appropriate window size based on resolution - thresh := Sauvola(img, *ksize, *wsize) - if err != nil { - log.Fatal("Error binarising image\n") - } - - err = imgio.Imwrite(thresh, flag.Arg(1)) - if err != nil { - log.Fatalf("Could not write image %s\n", flag.Arg(1)) - } -} -- cgit v1.2.1-24-ge1ad