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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 preproc
import (
"flag"
"fmt"
"image"
"image/png"
"os"
"testing"
)
func TestBinarization(t *testing.T) {
var slow = flag.Bool("slow", false, "include slow tests")
var update = flag.Bool("updatesauvola", false, "update golden files")
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":
if *slow {
actual = Sauvola(orig, c.ksize, c.wsize)
} else {
t.Skip("Skipping slow test; use -slow to run it.\n")
}
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)
}
})
}
}
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