Reorganise image manipulation to separate integral image parts

Also unify everything else under preproc/

Note that the UsefulImg interface should be used by the main
functions, to simplify things, but this hasn't been done yet.

1 files changed, 0 insertions, 108 deletions

diff --git a/binarize/sauvola_test.go b/binarize/sauvola_test.go
deleted file mode 100644
index 5faeb61..0000000
--- a/binarize/sauvola_test.go
+++ /dev/null
@@ -1,108 +0,0 @@
-package binarize
-
-import (
-	"flag"
-	"fmt"
-	"image"
-	"image/draw"
-	"image/png"
-	"os"
-	"testing"
-)
-
-var update = flag.Bool("update", false, "update golden files")
-
-func decode(s string) (*image.Gray, error) {
-	f, err := os.Open(s)
-	defer f.Close()
-	if err != nil {
-		return nil, err
-	}
-	img, err := png.Decode(f)
-	if err != nil {
-		return nil, err
-	}
-	b := img.Bounds()
-	gray := image.NewGray(image.Rect(0, 0, b.Dx(), b.Dy()))
-	draw.Draw(gray, b, img, b.Min, draw.Src)
-	return gray, nil
-}
-
-func imgsequal(img1 *image.Gray, img2 *image.Gray) bool {
-	b := img1.Bounds()
-	if ! b.Eq(img2.Bounds())  {
-		return false
-	}
-	for y := b.Min.Y; y < b.Max.Y; y++ {
-		for x := b.Min.X; x < b.Max.X; x++ {
-			r0, g0, b0, a0 := img1.At(x, y).RGBA()
-			r1, g1, b1, a1 := img2.At(x, y).RGBA()
-			if r0 != r1 {
-				return false
-			}
-			if g0 != g1 {
-				return false
-			}
-			if b0 != b1 {
-				return false
-			}
-			if a0 != a1 {
-				return false
-			}
-		}
-	}
-	return true
-}
-
-func TestBinarization(t *testing.T) {
-	cases := []struct {
-		name string
-		orig string
-		golden string
-		ksize float64
-		wsize int
-	}{
-		{"integralsauvola", "testdata/pg1.png", "testdata/pg1_integralsauvola_k0.5_w41.png", 0.5, 41},
-		{"integralsauvola", "testdata/pg1.png", "testdata/pg1_integralsauvola_k0.5_w19.png", 0.5, 19},
-		{"integralsauvola", "testdata/pg1.png", "testdata/pg1_integralsauvola_k0.3_w19.png", 0.3, 19},
-		{"sauvola", "testdata/pg1.png", "testdata/pg1_sauvola_k0.5_w41.png", 0.5, 41},
-		{"sauvola", "testdata/pg1.png", "testdata/pg1_sauvola_k0.5_w19.png", 0.5, 19},
-		{"sauvola", "testdata/pg1.png", "testdata/pg1_sauvola_k0.3_w19.png", 0.3, 19},
-	}
-
-	for _, c := range cases {
-		t.Run(fmt.Sprintf("%s_%0.1f_%d", c.name, c.ksize, c.wsize), func(t *testing.T) {
-			var actual *image.Gray
-			orig, err := decode(c.orig)
-			if err != nil {
-				t.Fatalf("Could not open file %s: %v\n", c.orig, err)
-			}
-			switch c.name {
-			case "integralsauvola":
-				actual = IntegralSauvola(orig, c.ksize, c.wsize)
-			case "sauvola":
-				actual = Sauvola(orig, c.ksize, c.wsize)
-			default:
-				t.Fatalf("No method %s\n", c.name)
-			}
-			if *update {
-				f, err := os.Create(c.golden)
-				defer f.Close()
-				if err != nil {
-					t.Fatalf("Could not open file %s to update: %v\n", c.golden, err)
-				}
-				err = png.Encode(f, actual)
-				if err != nil {
-					t.Fatalf("Could not encode update of %s: %v\n", c.golden, err)
-				}
-			}
-			golden, err := decode(c.golden)
-			if err != nil {
-				t.Fatalf("Could not open file %s: %v\n", c.golden, err)
-			}
-			if ! imgsequal(golden, actual) {
-				t.Errorf("Binarized %s differs to %s\n", c.orig, c.golden)
-			}
-		})
-	}
-}