From 5d538b4b5e1db7b70a0d61e3a1302e909cf96d85 Mon Sep 17 00:00:00 2001 From: Thomas Kastner Date: Wed, 20 Aug 2014 11:51:19 +0200 Subject: [PATCH] added path from go image to opencv image and back. --- opencv/cxcore.go | 53 +++++++++++++++++++++++++++++++++++++++++++ opencv/cxtype.go | 4 ++-- opencv/goimage.go | 57 +++++++++++++++++++++++++++++++++++++++++++++++ opencv/highgui.go | 4 ++-- 4 files changed, 114 insertions(+), 4 deletions(-) create mode 100644 opencv/goimage.go diff --git a/opencv/cxcore.go b/opencv/cxcore.go index 917e676..ca81a59 100644 --- a/opencv/cxcore.go +++ b/opencv/cxcore.go @@ -114,6 +114,39 @@ 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(x), C.int(y)) + 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(x), C.int(y), C.int(z)) + 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(x), C.int(y), (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(x), C.int(y), C.int(z), (C.CvScalar)(value)) +} + /* GetMat returns the matrix header for an image.*/ func (img *IplImage) GetMat() *Mat { var null C.int @@ -155,6 +188,11 @@ 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() { @@ -275,6 +313,21 @@ 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..9e590a6 --- /dev/null +++ b/opencv/goimage.go @@ -0,0 +1,57 @@ +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(buf, CV_LOAD_IMAGE_UNCHANGED) +} + +/* From Image converts a go image.Image to an opencv.IplImage. */ +func FromImage(img image.Image) *IplImage { + b := img.Bounds() + model := color.NRGBAModel + dst := CreateImage( + b.Max.Y-b.Min.Y, + b.Max.X-b.Min.X, + 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.NRGBA) + + value := NewScalar(float64(c.B), float64(c.G), float64(c.R), float64(c.A)) + dst.Set2D(x, y, value) + } + } + + 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/highgui.go b/opencv/highgui.go index e2a1490..8583b59 100644 --- a/opencv/highgui.go +++ b/opencv/highgui.go @@ -399,11 +399,11 @@ func SaveImage(filename string, image *IplImage, params int) int { } /* decode image stored in the buffer */ -func DecodeImage(buf unsafe.Pointer, iscolor int) *IplImage { +func DecodeImage(buf *Mat, iscolor int) *IplImage { rv := C.cvDecodeImage((*C.CvMat)(buf), C.int(iscolor)) return (*IplImage)(rv) } -func DecodeImageM(buf unsafe.Pointer, iscolor int) *Mat { +func DecodeImageM(buf *Mat, iscolor int) *Mat { rv := C.cvDecodeImageM((*C.CvMat)(buf), C.int(iscolor)) return (*Mat)(rv) }