diff options
author | Nick White <git@njw.name> | 2019-10-08 15:37:07 +0100 |
---|---|---|
committer | Nick White <git@njw.name> | 2019-10-08 15:37:07 +0100 |
commit | 787d63fc5d13c6250bd33da5a8e1eadbe86188cd (patch) | |
tree | 0b6888914ec5a492f95e256095799096ff4d7873 /preproc/preprocmulti.go | |
parent | d43c11bf653bfe3c1ad1ed277f1ec08bf155cf98 (diff) |
Continue separating the repository; remove all but preproc, and move integralimg package under it
Diffstat (limited to 'preproc/preprocmulti.go')
-rw-r--r-- | preproc/preprocmulti.go | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/preproc/preprocmulti.go b/preproc/preprocmulti.go deleted file mode 100644 index 2e7cb06..0000000 --- a/preproc/preprocmulti.go +++ /dev/null @@ -1,94 +0,0 @@ -package preproc - -// TODO: come up with a way to set a good ksize automatically - -import ( - "fmt" - "image" - "image/draw" - _ "image/jpeg" - "image/png" - "os" - "strings" - - "rescribe.xyz/go.git/integralimg" -) - -// TODO: do more testing to see how good this assumption is -func autowsize(bounds image.Rectangle) int { - return bounds.Dx() / 60 -} - -// PreProcMulti binarizes and preprocesses an image with multiple binarisation levels. -// inPath: Path of input image. -// ksizes: Slice of k values to pass to Sauvola algorithm -// binType: Type of binarization threshold. binary or zeroinv are currently implemented. -// binWsize: Window size for sauvola binarization algorithm. Set automatically based on resolution if 0. -// wipe: Whether to wipe (clear sides) the image -// wipeWsize: Window size for wiping algorithm -// wipeMinWidthPerc: Minimum percentage of the image width for the content width calculation to be considered valid -// Note: copied from cmd/preprocmulti/main.go, should think about the best way -// to organise this code later. -// TODO: return errors that encapsulate the err describing where it was encountered -// TODO: do the post-integral image stuff in separate goroutines for speed -func PreProcMulti(inPath string, ksizes []float64, binType string, binWsize int, wipe bool, wipeWsize int, wipeMinWidthPerc int) ([]string, error) { - // Make outBase inPath up to final . - s := strings.Split(inPath, ".") - outBase := strings.Join(s[:len(s)-1], "") - - var donePaths []string - - f, err := os.Open(inPath) - if err != nil { - return donePaths, err - } - defer f.Close() - img, _, err := image.Decode(f) - if err != nil { - return donePaths, 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++ - } - - var clean, threshimg image.Image - integrals := integralimg.ToAllIntegralImg(gray) - - for _, k := range ksizes { - threshimg = PreCalcedSauvola(integrals, gray, k, binWsize) - - if binType == "zeroinv" { - threshimg, err = BinToZeroInv(threshimg.(*image.Gray), img.(*image.RGBA)) - if err != nil { - return donePaths, err - } - } - - if wipe { - clean = Wipe(threshimg.(*image.Gray), wipeWsize, k*0.02, wipeMinWidthPerc) - } else { - clean = threshimg - } - - savefn := fmt.Sprintf("%s_bin%0.1f.png", outBase, k) - f, err = os.Create(savefn) - if err != nil { - return donePaths, err - } - defer f.Close() - err = png.Encode(f, clean) - if err != nil { - return donePaths, err - } - donePaths = append(donePaths, savefn) - } - return donePaths, nil -} |