// FloatMatrix returns an Image in the GRAY colorspace as FloatMatrix,
// where each pixel represents an element of the matrix. Each element
// is normalized to the [0,1] range.
func (im *Image) FloatMatrix() (FloatMatrix, error) {
if im.Colorspace() != GRAY {
return nil, fmt.Errorf("FloatMatrix() is available only for GRAY images, this one is in %s", im.Colorspace())
}
width := im.Width()
height := im.Height()
ptrs := make([]*C.double, width)
for ii := range ptrs {
ptrs[ii] = allocDoublePtr(height)
}
defer func() {
for _, p := range ptrs {
freeDoublePtr(p)
}
}()
var ex C.ExceptionInfo
C.GetExceptionInfo(&ex)
defer C.DestroyExceptionInfo(&ex)
C.image_matrix(im.image, (**C.double)(unsafe.Pointer(&ptrs[0])), &ex)
if ex.severity != C.UndefinedException {
return nil, exError(&ex, "generating float matrix")
}
m := make([][]float64, width)
for ii := range m {
m[ii] = doublePtrToFloat64Slice(ptrs[ii], height)
}
return FloatMatrix(m), nil
}
// FloatMatrix returns an Image in the GRAY colorspace as FloatMatrix,
// where each pixel represents an element of the matrix. Each element
// is normalized to the [0,1] range.
func (im *Image) FloatMatrix() (FloatMatrix, error) {
if im.Colorspace() != GRAY {
return nil, fmt.Errorf("FloatMatrix() is available only for GRAY images, this one is in %s", im.Colorspace())
}
width := im.Width()
height := im.Height()
m := make([][]float64, width)
ptrs := make([]unsafe.Pointer, width)
for ii := range m {
col := make([]float64, height)
m[ii] = col
ptrs[ii] = unsafe.Pointer(&col[0])
}
var ex C.ExceptionInfo
C.GetExceptionInfo(&ex)
defer C.DestroyExceptionInfo(&ex)
C.image_matrix(im.image, (**C.double)(unsafe.Pointer(&ptrs[0])), &ex)
if ex.severity != C.UndefinedException {
return nil, exError(&ex, "generating float matrix")
}
return FloatMatrix(m), nil
}