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authorNick White <git@njw.name>2019-03-26 15:43:21 +0000
committerNick White <git@njw.name>2019-03-26 15:43:21 +0000
commitf20982f465ee4735caf5b0ebc3c57af31ee90e75 (patch)
tree5a95c160f28b5a2faa05277bf827a7dc1dbe2485 /sauvola
parent7d4cc9f7dd297c08e02447dda1f8aad9db0b0768 (diff)
Move sauvola binarization tool to cmd/binarize
Diffstat (limited to 'sauvola')
-rw-r--r--sauvola/main.go69
1 files changed, 0 insertions, 69 deletions
diff --git a/sauvola/main.go b/sauvola/main.go
deleted file mode 100644
index c4b9562..0000000
--- a/sauvola/main.go
+++ /dev/null
@@ -1,69 +0,0 @@
-package main
-
-import (
- "flag"
- "fmt"
- "image"
- "image/draw"
- _ "image/jpeg"
- "image/png"
- "log"
- "os"
-
- "rescribe.xyz/go.git/binarize"
-)
-
-// 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: sauvola [-w num] [-k num] inimg outimg\n")
- flag.PrintDefaults()
- }
- wsize := flag.Int("w", 0, "Window size for sauvola algorithm. Set automatically based on resolution if not set.")
- ksize := flag.Float64("k", 0.5, "K for sauvola algorithm. This controls the overall threshold level. Set it lower for very light text (try 0.1 or 0.2).")
- 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 *wsize == 0 {
- *wsize = autowsize(b)
- log.Printf("Set window size to %d\n", *wsize)
- }
-
- if *wsize % 2 == 0 {
- *wsize++
- }
-
- // TODO: come up with a way to set a good ksize automatically
-
- thresh := binarize.IntegralSauvola(gray, *ksize, *wsize)
-
- 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, thresh)
- if err != nil {
- log.Fatalf("Could not encode image: %v\n", err)
- }
-}