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authorNick White <git@njw.name>2019-10-08 15:37:07 +0100
committerNick White <git@njw.name>2019-10-08 15:37:07 +0100
commit787d63fc5d13c6250bd33da5a8e1eadbe86188cd (patch)
tree0b6888914ec5a492f95e256095799096ff4d7873 /sauvola_test.go
parentd43c11bf653bfe3c1ad1ed277f1ec08bf155cf98 (diff)
Continue separating the repository; remove all but preproc, and move integralimg package under it
Diffstat (limited to 'sauvola_test.go')
-rw-r--r--sauvola_test.go70
1 files changed, 70 insertions, 0 deletions
diff --git a/sauvola_test.go b/sauvola_test.go
new file mode 100644
index 0000000..2331e10
--- /dev/null
+++ b/sauvola_test.go
@@ -0,0 +1,70 @@
+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)
+ }
+ })
+ }
+}