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hashes_test.go
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hashes_test.go
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package imagehash
import (
"image"
"reflect"
"testing"
"github.com/vitali-fedulov/images4"
)
var p1 = []uint16{
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255}
var p2 = []uint16{
231, 183, 148, 21, 47, 16, 69, 45, 151, 64, 181,
49, 243, 60, 147, 177, 19, 85, 205, 146, 236,
67, 28, 163, 143, 94, 138, 214, 149, 103, 57,
145, 74, 249, 235, 212, 30, 202, 88, 244, 196,
118, 95, 59, 148, 49, 165, 92, 10, 39, 253, 16,
2, 166, 126, 196, 22, 53, 84, 156, 117, 178, 8,
171, 134, 189, 7, 226, 156, 51, 211, 230, 14,
242, 165, 4, 246, 208, 35, 176, 248, 91, 81,
174, 68, 166, 15, 199, 78, 233, 75, 99, 117,
55, 140, 194, 127, 133, 198, 173, 2, 126, 84,
57, 88, 150, 72, 168, 41, 44, 43, 169, 143, 96,
75, 33, 204, 161, 153, 120, 178, 99, 181, 49,
132, 91, 38, 164, 45, 87, 92, 80, 85, 87, 195,
18, 220, 155, 66, 145, 239, 61, 222, 206, 235,
141, 75, 247, 223, 102, 232, 163, 17, 213, 221,
161, 175, 27, 191, 178, 243, 220, 86, 149, 34,
85, 185, 140, 30, 171, 213, 244, 192, 79, 254,
211, 9, 167, 176, 246, 62, 245, 42, 29, 192,
12, 10, 250, 10, 89, 182, 219, 49, 51, 38, 38,
25, 21, 76, 182, 163, 22, 200, 183, 242, 157,
71, 57, 99, 102, 84, 183, 143, 239, 220, 237,
221, 161, 167, 92, 245, 42, 223, 104, 50, 0,
106, 131, 53, 56, 177, 208, 49, 125, 212, 255,
169, 126, 154, 240, 161, 61, 23, 163, 60, 176,
138, 250, 211, 205, 134, 198, 36, 212, 206,
29, 233, 107, 109, 104, 36, 81, 53, 167, 204,
25, 60, 143, 234, 246, 63, 181, 109, 100, 149,
28, 56, 195, 155, 114, 141, 70, 139, 222, 207,
30, 213, 154, 238, 98, 117, 96, 182, 85, 17,
241, 21, 250, 4, 241, 173, 217, 53, 169, 158,
252, 221, 237, 252, 85, 59, 25, 209, 191, 120,
191, 122, 228, 240, 254, 133, 74, 190, 59, 180,
220, 27, 90, 197, 183, 179, 164, 188, 52, 105,
8, 149, 248, 11, 132, 248, 126, 99, 118, 227,
163, 82, 236, 98, 206, 218, 154, 231, 5, 201,
125, 47, 238, 152, 154, 12, 115, 225}
var p3 = []uint16{
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0}
func TestHashSet(t *testing.T) {
want := []uint64{
13332021, 1013332021, 13332121,
1013332121, 13332022, 1013332022,
13332122, 1013332122}
icon2 := images4.EmptyIcon()
for i := range p2 {
p2[i] = 255 * p2[i] // Premultiplication.
}
icon2.Pixels = p2
got := HashSet(icon2, HyperPoints10, 0.25, 4)
if !reflect.DeepEqual(got, want) {
t.Errorf("Wanted %v, got %v.", want, got)
}
want = []uint64{0}
icon3 := images4.EmptyIcon()
for i := range p3 {
p3[i] = 255 * p3[i] // Premultiplication.
}
icon3.Pixels = p3
got = HashSet(icon3, HyperPoints10, 0.25, 4)
if !reflect.DeepEqual(got, want) {
t.Errorf("Wanted %v, got %v.", want, got)
}
}
func TestCentralHash(t *testing.T) {
want := uint64(3333333333)
icon1 := images4.EmptyIcon()
for i := range p1 {
p1[i] = 255 * p1[i] // Premultiplication.
}
icon1.Pixels = p1
got := CentralHash(icon1, HyperPoints10, 0.25, 4)
if !reflect.DeepEqual(got, want) {
t.Errorf("Wanted %v, got %v.", want, got)
}
want = uint64(13332021)
icon2 := images4.EmptyIcon()
icon2.Pixels = p2
got = CentralHash(icon2, HyperPoints10, 0.25, 4)
if !reflect.DeepEqual(got, want) {
t.Errorf("Wanted %v, got %v.", want, got)
}
}
func TestHyperPoints10(t *testing.T) {
s := HyperPoints10
if len(s) != 10 {
t.Errorf(
"Mismatching set length. Expected 10, got %v",
len(s))
}
for _, p1 := range s {
for _, p2 := range s {
if p1 == p2 {
continue
}
d := distance(p1, p2)
if d < 2 {
t.Errorf(
`Too small distance between points, got
distance %v, between points %v and %v`,
d, p1, p2)
}
}
}
}
// The test can be brittle, but should be fine, if you rerun it a few times,
// because point selection is not strict in terms of algorithm performance.
func TestSelectPoints(t *testing.T) {
got := CustomPoints(5)
want := map[image.Point]bool{
{2, 2}: true, {2, 8}: true, {5, 5}: true,
{8, 2}: true, {8, 8}: true}
for k := range got {
if _, ok := want[k]; !ok {
t.Errorf(
"Missing point %v in expected %v", k, want)
}
}
got = CustomPoints(12)
if len(got) != 12 {
t.Errorf(
"Mismatching set length. Expected 12, got %v",
len(got))
}
if _, ok := got[image.Point{1, 1}]; !ok {
t.Errorf(
"Missing point{1, 1} in the result %v", got)
}
for p1 := range got {
for p2 := range got {
if p1 == p2 {
continue
}
d := distance(p1, p2)
if d < 2 {
t.Errorf(
`Too small distance between points, got
distance %v, between points %v and %v`,
d, p1, p2)
}
}
}
}
func TestDistance(t *testing.T) {
got := distance(
image.Point{5, 7}, image.Point{2, 8})
want := 3.1622776601683795
if got != want {
t.Errorf("Want %v, got %v", want, got)
}
}
func TestMinKey(t *testing.T) {
got := minKey(
map[image.Point]float64{
{1, 1}: 1.9, {2, 2}: 0.3, {3, 3}: 0.01,
{7, 7}: 12.0, {9, 9}: 3.0})
want := image.Point{3, 3}
if got != want {
t.Errorf("Want %v, got %v", want, got)
}
}
func TestMaxKey(t *testing.T) {
got := maxKey(
map[image.Point]float64{
{1, 1}: 1.9, {2, 2}: 0.3, {3, 3}: 0.01,
{7, 7}: 12.0, {9, 9}: 3.0})
want := image.Point{7, 7}
if got != want {
t.Errorf("Want %v, got %v", want, got)
}
}
func TestExlude(t *testing.T) {
got := exclude(
image.Point{2, 2}, map[image.Point]bool{
{1, 1}: true, {2, 2}: true, {3, 3}: true,
{7, 7}: true, {9, 9}: true})
want := map[image.Point]bool{
{1, 1}: true, {3, 3}: true,
{7, 7}: true, {9, 9}: true}
if !reflect.DeepEqual(got, want) {
t.Errorf("Want %v, got %v", want, got)
}
}
func TestNearest(t *testing.T) {
got := nearest(
map[image.Point]bool{
{1, 1}: true, {2, 2}: true, {3, 3}: true,
{7, 7}: true, {9, 9}: true},
image.Point{6, 6})
want := image.Point{7, 7}
if got != want {
t.Errorf("Want %v, got %v", want, got)
}
got = nearest(
map[image.Point]bool{
{1, 1}: true, {2, 2}: true, {3, 3}: true,
{7, 7}: true, {9, 9}: true},
image.Point{3, 3})
want = image.Point{2, 2}
if got != want {
t.Errorf("Want %v, got %v", want, got)
}
}