forked from disintegration/gift
/
convolution_test.go
568 lines (536 loc) · 14.7 KB
/
convolution_test.go
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package gift
import (
"image"
"testing"
)
func TestConvolution(t *testing.T) {
testData := []struct {
desc string
kernel []float32
normalize, alpha, abs bool
delta float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"convolution (0x0, false, false, false, 0)",
[]float32{},
false, false, false, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (3x3, false, false, false, 0)",
[]float32{
0, 0, 1,
0, 0, 0,
1, 0, 0,
},
false, false, false, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x00, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x00, 0xA0, 0xA0, 0xA0, 0x00, 0x20, 0x40, 0x60, 0x00,
0x80, 0x60, 0x40, 0x20, 0x80, 0x60, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (3x3, true, false, false, 0)",
[]float32{
0, 0, 1,
0, 0, 0,
1, 0, 0,
},
true, false, false, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x10, 0x20, 0x30, 0x00, 0x10, 0x20, 0x30, 0x80,
0x40, 0x30, 0x20, 0x00, 0x50, 0x50, 0x50, 0x00, 0x10, 0x20, 0x30, 0x00,
0x40, 0x30, 0x20, 0x20, 0x40, 0x30, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (3x3, false, true, false, 0)",
[]float32{
0, 0, 1,
0, 0, 0,
1, 0, 0,
},
false, true, false, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0xA0, 0xA0, 0xA0, 0xA0, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (3x3, true, true, true, 0)",
[]float32{
0, 0, 0,
-0.5, 0, 0.5,
0, 0, 0,
},
true, true, true, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0x60, 0x20, 0x20, 0x60, 0x20, 0x40, 0x60, 0x80,
0x80, 0x60, 0x40, 0x20, 0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (3x3, false, true, false, 3 / 255.0)",
[]float32{
0, 0, 1,
0, 0, 0,
1, 0, 0,
},
false, true, false, 3 / 255.0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x03, 0x03, 0x03, 0x03, 0x23, 0x43, 0x63, 0x83, 0x23, 0x43, 0x63, 0x83,
0x83, 0x63, 0x43, 0x23, 0xA3, 0xA3, 0xA3, 0xA3, 0x23, 0x43, 0x63, 0x83,
0x83, 0x63, 0x43, 0x23, 0x83, 0x63, 0x43, 0x23, 0x03, 0x03, 0x03, 0x03,
},
},
{
"convolution (3x3, false, false, true, 0)",
[]float32{
0, 0, -0.5,
0, 0, 0,
0, 0, 0,
},
false, false, true, 0.0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x10, 0x20, 0x30, 0x00, 0x10, 0x20, 0x30, 0x80,
0x00, 0x00, 0x00, 0x00, 0x10, 0x20, 0x30, 0x00, 0x10, 0x20, 0x30, 0x00,
0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"convolution (7x7, false, true, false, 0)",
[]float32{
0, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0, 0,
},
false, true, false, 0,
image.Rect(-1, -1, 2, 2),
image.Rect(0, 0, 3, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x40, 0x60, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x80, 0x60, 0x40, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0,
0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0,
0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0, 0xA0,
},
},
}
for _, d := range testData {
src := image.NewNRGBA(d.srcb)
src.Pix = d.srcPix
f := Convolution(d.kernel, d.normalize, d.alpha, d.abs, d.delta)
dst := image.NewNRGBA(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
testKernelSizes := []struct {
klen, size int
}{
{0, 0},
{1, 1}, {3, 1}, {8, 1},
{9, 3}, {16, 3}, {24, 3},
{25, 5}, {40, 5}, {48, 5},
}
for _, d := range testKernelSizes {
tmp := make([]float32, d.klen)
sz, _ := prepareConvolutionWeights(tmp, true)
if sz != d.size {
t.Errorf("unexpected kernel size: %d %d", d.klen, sz)
}
}
// check no panics
Convolution([]float32{}, true, true, true, 1).Draw(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), nil)
convolve1dh(image.NewGray(image.Rect(0, 0, 1, 1)), image.NewGray(image.Rect(0, 0, 1, 1)), []float32{}, nil)
convolve1dv(image.NewGray(image.Rect(0, 0, 1, 1)), image.NewGray(image.Rect(0, 0, 1, 1)), []float32{}, nil)
convolve1dh(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), []float32{}, nil)
convolve1dv(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), []float32{}, nil)
convolveLine([]pixel{}, []pixel{}, []uweight{})
prepareConvolutionWeights1d([]float32{0, 0})
prepareConvolutionWeights1d([]float32{})
}
func TestGaussianBlur(t *testing.T) {
testData := []struct {
desc string
sigma float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"blur (0.0)",
0.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
},
{
"blur (0.3)",
0.3,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x00, 0x01, 0x00, 0x01, 0x00,
0x01, 0xBD, 0x01, 0xBD, 0x01,
0x00, 0x01, 0x00, 0x01, 0x00,
},
},
{
"blur (1.0)",
1.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x0B, 0x15, 0x16, 0x15, 0x0B,
0x13, 0x23, 0x25, 0x23, 0x13,
0x0B, 0x15, 0x16, 0x15, 0x0B,
},
},
{
"blur (3.0)",
3.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xC0, 0x00, 0xC0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00,
},
[]uint8{
0x05, 0x06, 0x06, 0x06, 0x05,
0x05, 0x06, 0x06, 0x06, 0x05,
0x05, 0x06, 0x06, 0x06, 0x05,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := GaussianBlur(d.sigma)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
// check no panics
GaussianBlur(0.5).Draw(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), nil)
}
func TestUnsharpMask(t *testing.T) {
testData := []struct {
desc string
sigma, amount, thresold float32
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"unsharp mask (0.3, 1.0, 0.0)",
0.3, 1.0, 0.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB1, 0xA1, 0xB1, 0x60,
0x00, 0x81, 0x00, 0x81, 0x00,
},
},
{
"unsharp mask (1.0, 1.0, 0.0)",
1.0, 1.0, 0.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x45, 0x00, 0x45, 0x00,
0x82, 0xFF, 0xE4, 0xFF, 0x82,
0x00, 0xB2, 0x00, 0xB2, 0x00,
},
},
{
"unsharp mask (1.0, 0.5, 0.0)",
1.0, 0.5, 0.0,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x42, 0x00, 0x42, 0x00,
0x71, 0xDD, 0xC2, 0xDD, 0x71,
0x00, 0x99, 0x00, 0x99, 0x00,
},
},
{
"unsharp mask (1.0, 1.0, 0.05)",
1.0, 1.0, 0.05,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x82, 0xFF, 0xE4, 0xFF, 0x82,
0x00, 0xB2, 0x00, 0xB2, 0x00,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := UnsharpMask(d.sigma, d.amount, d.thresold)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
// check no panics
UnsharpMask(0.5, 1.0, 0.0).Draw(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), nil)
}
func TestMean(t *testing.T) {
testData := []struct {
desc string
ksize int
disk bool
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"mean (0x0 false)",
0, false,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"mean (1x1 false)",
1, false,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"mean (2x2 true)",
2, true,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
[]uint8{
0x00, 0x40, 0x00, 0x40, 0x00,
0x60, 0xB0, 0xA0, 0xB0, 0x60,
0x00, 0x80, 0x00, 0x80, 0x00,
},
},
{
"mean (3x3 false)",
3, false,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x10, 0x40, 0x00, 0x40, 0x10,
0x20, 0x50, 0x00, 0x50, 0x20,
0x30, 0x60, 0x00, 0x60, 0x30,
},
[]uint8{
0x25, 0x1E, 0x2E, 0x1E, 0x25,
0x30, 0x25, 0x35, 0x25, 0x30,
0x3B, 0x2C, 0x3C, 0x2C, 0x3B,
},
},
{
"mean (3x3 true)",
3, true,
image.Rect(-1, -1, 4, 2),
image.Rect(0, 0, 5, 3),
[]uint8{
0x10, 0x40, 0x00, 0x40, 0x10,
0x20, 0x50, 0x00, 0x50, 0x20,
0x30, 0x60, 0x00, 0x60, 0x30,
},
[]uint8{
0x1D, 0x2D, 0x1A, 0x2D, 0x1D,
0x2A, 0x36, 0x20, 0x36, 0x2A,
0x36, 0x40, 0x26, 0x40, 0x36,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := Mean(d.ksize, d.disk)
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
// check no panics
Mean(5, false).Draw(image.NewGray(image.Rect(0, 0, 0, 0)), image.NewGray(image.Rect(0, 0, 0, 0)), nil)
}
func TestSobel(t *testing.T) {
testData := []struct {
desc string
srcb, dstb image.Rectangle
srcPix, dstPix []uint8
}{
{
"sobel 0x0",
image.Rect(0, 0, 0, 0),
image.Rect(0, 0, 0, 0),
[]uint8{},
[]uint8{},
},
{
"sobel 6x6",
image.Rect(-1, -1, 5, 5),
image.Rect(0, 0, 6, 6),
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x99, 0x99, 0x99, 0x99,
0x00, 0x00, 0x99, 0x99, 0x99, 0x99,
0x00, 0x00, 0x99, 0x99, 0x99, 0x99,
0x00, 0x00, 0x99, 0x99, 0x99, 0x99,
},
[]uint8{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xd8, 0xff, 0xff, 0xff, 0xff,
0x00, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
0x00, 0xff, 0xff, 0x00, 0x00, 0x00,
},
},
}
for _, d := range testData {
src := image.NewGray(d.srcb)
src.Pix = d.srcPix
f := Sobel()
dst := image.NewGray(f.Bounds(src.Bounds()))
f.Draw(dst, src, nil)
if !checkBoundsAndPix(dst.Bounds(), d.dstb, dst.Pix, d.dstPix) {
t.Errorf("test [%s] failed: %#v, %#v", d.desc, dst.Bounds(), dst.Pix)
}
}
}