diff --git a/opencv/cv.go b/opencv/cv.go index ea9eb7d..4d20598 100644 --- a/opencv/cv.go +++ b/opencv/cv.go @@ -18,8 +18,9 @@ func init() { } const ( - CV_BGR2GRAY = C.CV_BGR2GRAY - CV_BGR2BGRA = C.CV_BGR2BGRA + CV_BGR2GRAY = C.CV_BGR2GRAY + CV_BGR2BGRA = C.CV_BGR2BGRA + CV_RGBA2BGRA = C.CV_RGBA2BGRA CV_BLUR = C.CV_BLUR diff --git a/opencv/cxcore.go b/opencv/cxcore.go index 917e676..b2b335a 100644 --- a/opencv/cxcore.go +++ b/opencv/cxcore.go @@ -57,6 +57,11 @@ func CreateImage(w, h, depth, channels int) *IplImage { return (*IplImage)(img) } +/* SetData assigns user data to the image header */ +func (img *IplImage) SetData(data unsafe.Pointer, step int) { + C.cvSetData(unsafe.Pointer(img), data, C.int(step)) +} + /* Releases (i.e. deallocates) IPL image header */ func (img *IplImage) ReleaseHeader() { img_c := (*C.IplImage)(img) @@ -69,6 +74,10 @@ func (img *IplImage) Release() { C.cvReleaseImage(&img_c) } +func (img *IplImage) Zero() { + C.cvSetZero(unsafe.Pointer(img)) +} + /* Creates a copy of IPL image (widthStep may differ) */ func (img *IplImage) Clone() *IplImage { p := C.cvCloneImage((*C.IplImage)(img)) @@ -114,6 +123,39 @@ func (img *IplImage) Reshape(channels, rows, _type int) *Mat { return (*Mat)(n) } +/* Get1D return a specific element from a 1-dimensional matrix. */ +func (img *IplImage) Get1D(x int) Scalar { + ret := C.cvGet1D(unsafe.Pointer(img), C.int(x)) + return Scalar(ret) +} + +/* Get2D return a specific element from a 2-dimensional matrix. */ +func (img *IplImage) Get2D(x, y int) Scalar { + ret := C.cvGet2D(unsafe.Pointer(img), C.int(y), C.int(x)) + return Scalar(ret) +} + +/* Get3D return a specific element from a 3-dimensional matrix. */ +func (img *IplImage) Get3D(x, y, z int) Scalar { + ret := C.cvGet3D(unsafe.Pointer(img), C.int(z), C.int(y), C.int(x)) + return Scalar(ret) +} + +/* Set1D sets a particular element in the image */ +func (img *IplImage) Set1D(x int, value Scalar) { + C.cvSet1D(unsafe.Pointer(img), C.int(x), (C.CvScalar)(value)) +} + +/* Set2D sets a particular element in the image */ +func (img *IplImage) Set2D(x, y int, value Scalar) { + C.cvSet2D(unsafe.Pointer(img), C.int(y), C.int(x), (C.CvScalar)(value)) +} + +/* Set3D sets a particular element in the image */ +func (img *IplImage) Set3D(x, y, z int, value Scalar) { + C.cvSet3D(unsafe.Pointer(img), C.int(z), C.int(y), C.int(x), (C.CvScalar)(value)) +} + /* GetMat returns the matrix header for an image.*/ func (img *IplImage) GetMat() *Mat { var null C.int @@ -155,6 +197,11 @@ func (mat *Mat) InitHeader(rows, cols, type_ int, data unsafe.Pointer, step int) ) } +/* SetData assigns user data to the matrix header. */ +func (mat *Mat) SetData(data unsafe.Pointer, step int) { + C.cvSetData(unsafe.Pointer(mat), data, C.int(step)) +} + /* Releases CvMat header and deallocates matrix data (reference counting is used for data) */ func (mat *Mat) Release() { @@ -179,6 +226,10 @@ func (mat *Mat) Clone() *Mat { return (*Mat)(mat_new) } +func (mat *Mat) Zero() { + C.cvSetZero(unsafe.Pointer(mat)) +} + /* Reshape changes shape of the matrix without copying data. A value of `0` means that channels or rows remain unchanged. @@ -275,6 +326,21 @@ func (m *Mat) Get3D(x, y, z int) Scalar { return Scalar(ret) } +/* Set1D sets a particular element in them matrix */ +func (m *Mat) Set1D(x int, value Scalar) { + C.cvSet1D(unsafe.Pointer(m), C.int(x), (C.CvScalar)(value)) +} + +/* Set2D sets a particular element in them matrix */ +func (m *Mat) Set2D(x, y int, value Scalar) { + C.cvSet2D(unsafe.Pointer(m), C.int(x), C.int(y), (C.CvScalar)(value)) +} + +/* Set3D sets a particular element in them matrix */ +func (m *Mat) Set3D(x, y, z int, value Scalar) { + C.cvSet3D(unsafe.Pointer(m), C.int(x), C.int(y), C.int(z), (C.CvScalar)(value)) +} + /* GetImage returns the image header for the matrix. */ func (m *Mat) GetImage(channels int) *IplImage { tmp := CreateImage(m.Cols(), m.Rows(), m.Type(), channels) diff --git a/opencv/cxtype.go b/opencv/cxtype.go index 8878bb6..ba46295 100644 --- a/opencv/cxtype.go +++ b/opencv/cxtype.go @@ -602,8 +602,8 @@ const ( type Scalar C.CvScalar -func NewScalar(b, g, r int) Scalar { - rv := C.cvScalar(C.double(b), C.double(g), C.double(r), C.double(0)) +func NewScalar(b, g, r, a float64) Scalar { + rv := C.cvScalar(C.double(b), C.double(g), C.double(r), C.double(a)) return (Scalar)(rv) } diff --git a/opencv/goimage.go b/opencv/goimage.go new file mode 100644 index 0000000..34c74e2 --- /dev/null +++ b/opencv/goimage.go @@ -0,0 +1,77 @@ +package opencv + +import ( + "image" + "image/color" + "unsafe" +) + +/* DecodeImageMem decodes an image from an in memory byte buffer. */ +func DecodeImageMem(data []byte) *IplImage { + buf := CreateMatHeader(1, len(data), CV_8U) + buf.SetData(unsafe.Pointer(&data[0]), CV_AUTOSTEP) + + return DecodeImage(unsafe.Pointer(buf), CV_LOAD_IMAGE_UNCHANGED) +} + +/* FromImage converts a go image.Image to an opencv.IplImage. */ +func FromImage(img image.Image) *IplImage { + b := img.Bounds() + model := color.RGBAModel + dst := CreateImage( + b.Max.X-b.Min.X, + b.Max.Y-b.Min.Y, + IPL_DEPTH_8U, 4) + + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + px := img.At(x, y) + c := model.Convert(px).(color.RGBA) + + value := NewScalar(float64(c.B), float64(c.G), float64(c.R), float64(c.A)) + dst.Set2D(x, y, value) + } + } + + return dst +} + +/* FromImageUnsafe create an opencv.IplImage that shares the buffer with the +go image.RGBA image. All changes made from opencv might affect go! */ +func FromImageUnsafe(img *image.RGBA) *IplImage { + b := img.Bounds() + buf := CreateImageHeader( + b.Max.X-b.Min.X, + b.Max.Y-b.Min.Y, + IPL_DEPTH_8U, 4) + dst := CreateImage( + b.Max.X-b.Min.X, + b.Max.Y-b.Min.Y, + IPL_DEPTH_8U, 4) + + buf.SetData(unsafe.Pointer(&img.Pix[0]), CV_AUTOSTEP) + CvtColor(buf, dst, CV_RGBA2BGRA) + buf.Release() + + return dst +} + +/* ToImage converts a opencv.IplImage to an go image.Image */ +func (img *IplImage) ToImage() image.Image { + out := image.NewNRGBA(image.Rect(0, 0, img.Width(), img.Height())) + if img.Depth() != IPL_DEPTH_8U { + return nil // TODO return error + } + + for y := 0; y < img.Height(); y++ { + for x := 0; x < img.Width(); x++ { + s := img.Get2D(x, y).Val() + b, g, r, a := s[2], s[1], s[0], s[3] + + c := color.NRGBA{uint8(r), uint8(g), uint8(b), uint8(a)} + out.Set(x, y, c) + } + } + + return out +} diff --git a/opencv/goimage_test.go b/opencv/goimage_test.go new file mode 100644 index 0000000..e0bc3b5 --- /dev/null +++ b/opencv/goimage_test.go @@ -0,0 +1,96 @@ +package opencv + +import ( + "image" + _ "image/jpeg" + _ "image/png" + "os" + "reflect" + "testing" +) + +func TestFromImage(t *testing.T) { + fh, err := os.Open("../images/pic5.png") + if err != nil { + t.Fatal(err) + } + + img, _, err := image.Decode(fh) + if err != nil { + t.Fatal(err) + } + + ocv := FromImage(img) + if ocv == nil { + t.Fatal("failed to convert image") + } + + width := img.Bounds().Max.X - img.Bounds().Min.X + height := img.Bounds().Max.Y - img.Bounds().Min.Y + if ocv.Width() != width || ocv.Height() != height { + t.Fatalf("loaded image has wrong dimensions: got %dx%d, expected %dx%d", ocv.Width(), ocv.Height(), width, height) + } + + ex := [4]float64{98, 139, 26, 255} + px := ocv.Get2D(50, 90).Val() + if !reflect.DeepEqual(px, ex) { + t.Fatalf("wrong color @50,90: got %v, expected %v", px, ex) + } +} + +func TestFromImageUnsafe(t *testing.T) { + fh, err := os.Open("../images/pic5.png") + if err != nil { + t.Fatal(err) + } + + img, _, err := image.Decode(fh) + if err != nil { + t.Fatal(err) + } + + rgba, ok := img.(*image.RGBA) + if !ok { + t.Fatal("image is no RGBA image") + } + + ocv := FromImageUnsafe(rgba) + if ocv == nil { + t.Fatal("failed to convert image") + } + + width := img.Bounds().Max.X - img.Bounds().Min.X + height := img.Bounds().Max.Y - img.Bounds().Min.Y + if ocv.Width() != width || ocv.Height() != height { + t.Fatalf("loaded image has wrong dimensions: got %dx%d, expected %dx%d", ocv.Width(), ocv.Height(), width, height) + } + + ex := [4]float64{98, 139, 26, 255} + px := ocv.Get2D(50, 90).Val() + if !reflect.DeepEqual(px, ex) { + t.Fatalf("wrong color @50,90: got %v, expected %v", px, ex) + } +} + +func BenchmarkFromImage(b *testing.B) { + fh, _ := os.Open("../images/pic5.png") + img, _, _ := image.Decode(fh) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + ocv := FromImage(img) + ocv.Release() + } +} + +func BenchmarkFromImageUnsafe(b *testing.B) { + fh, _ := os.Open("../images/pic5.png") + img, _, _ := image.Decode(fh) + b.ResetTimer() + + for i := 0; i < b.N; i++ { + rgba := img.(*image.RGBA) + ocv := FromImageUnsafe(rgba) + ocv.Release() + } +}