func TestCorrBLAS_vsNaive(t *testing.T) {
const (
m = 40
n = 30
w = 100
h = 80
eps = 1e-9
)
f := randImage(w, h)
g := randImage(m, n)
naive, err := slide.CorrNaive(f, g)
if err != nil {
t.Fatal(err)
}
blas, err := slide.CorrBLAS(f, g)
if err != nil {
t.Fatal(err)
}
if !naive.Size().Eq(blas.Size()) {
t.Fatalf("size mismatch (naive %v, blas %v)", naive.Size(), blas.Size())
}
if err := errIfNotEqImage(naive, blas, eps); err != nil {
t.Fatal(err)
}
}
func TestCorrNaive(t *testing.T) {
const eps = 1e-9
f := rimg64.FromRows([][]float64{
{1, 2, 3, 4, 5},
{2, 5, 4, 1, 3},
{5, 4, 3, 2, 1},
})
g := rimg64.FromRows([][]float64{
{3, 1, 5},
{2, 4, 1},
})
cases := []struct {
I, J int
Want float64
}{
// <g, [1 2 3; 2 5 4]>
{0, 0, 3*1 + 1*2 + 5*3 + 2*2 + 4*5 + 1*4},
// <g, [2 3 4; 5 4 1]>
{1, 0, 3*2 + 1*3 + 5*4 + 2*5 + 4*4 + 1*1},
// <g, [3 4 5; 4 1 3]>
{2, 0, 3*3 + 1*4 + 5*5 + 2*4 + 4*1 + 1*3},
// <g, [2 5 4; 5 4 3]>
{0, 1, 3*2 + 1*5 + 5*4 + 2*5 + 4*4 + 1*3},
// <g, [5 4 1; 4 3 2]>
{1, 1, 3*5 + 1*4 + 5*1 + 2*4 + 4*3 + 1*2},
// <g, [4 1 3; 3 2 1]>
{2, 1, 3*4 + 1*1 + 5*3 + 2*3 + 4*2 + 1*1},
}
h, err := slide.CorrNaive(f, g)
if err != nil {
t.Fatal(err)
}
if h.Width != 3 || h.Height != 2 {
t.Fatalf("wrong size: want %dx%d, got %dx%d", 3, 2, h.Width, h.Height)
}
for _, c := range cases {
if got := h.At(c.I, c.J); math.Abs(got-c.Want) > eps {
t.Errorf(
"not equal: (i, j) = (%d, %d): want %.5g, got %.5g",
c.I, c.J, c.Want, got,
)
}
}
}
func TestCorrStrideNaive_vsDecimate(t *testing.T) {
const eps = 1e-9
for _, q := range strideCases {
f := randImage(q.ImSize.X, q.ImSize.Y)
g := randImage(q.TmplSize.X, q.TmplSize.Y)
h, err := slide.CorrNaive(f, g)
if err != nil {
t.Errorf("im %v, tmpl %v, stride %d: %v", q.ImSize, q.TmplSize, q.K, err)
continue
}
want := slide.Decimate(h, q.K)
got, err := slide.CorrStrideNaive(f, g, q.K)
if err != nil {
t.Errorf("im %v, tmpl %v, stride %d: %v", q.ImSize, q.TmplSize, q.K, err)
continue
}
if err := errIfNotEqImage(want, got, eps); err != nil {
t.Errorf("im %v, tmpl %v, stride %d: %v", q.ImSize, q.TmplSize, q.K, err)
continue
}
}
}