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// 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
import (
"flag"
"fmt"
"image"
"image/draw"
_ "image/jpeg"
"image/png"
"log"
"os"
"rescribe.xyz/preproc"
)
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "Usage: wipe inimg outimg\n")
fmt.Fprintf(os.Stderr, "Wipes the sections of an image which are outside the content area.\n")
flag.PrintDefaults()
}
min := flag.Int("hm", 30, "Minimum percentage of the image width for the content width calculation to be considered valid.")
thresh := flag.Float64("ht", 0.05, "Threshold for the proportion of black pixels below which a window is determined to be the edge. Higher means more aggressive wiping.")
wsize := flag.Int("hw", 5, "Window size for mask finding algorithm.")
vmin := flag.Int("vm", 30, "Minimum percentage of the image height for the content width calculation to be considered valid.")
vthresh := flag.Float64("vt", 0.005, "Threshold for the proportion of black pixels below which a vertical wipe window is determined to be the edge. Higher means more aggressive wiping.")
vwsize := flag.Int("vw", 120, "Window size for vertical mask finding algorithm. Should be set to approximately line height + largest expected gap.")
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)
sidesdone := preproc.Wipe(gray, *wsize, *thresh, *min)
clean := preproc.VWipe(sidesdone, *vwsize, *vthresh, *vmin)
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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