Vips.Image.quadratic (original) (raw)
Method
VipsImagequadratic
Declaration [src]
int
vips_quadratic (
VipsImage* in,
VipsImage** out,
VipsImage* coeff,
...
)
Description [src]
Transform an image with a 0, 1, 2, or 3rd order polynomial.
The transform we compute:
`x = x' + a : order 0 image shift only
- b x' + c y' : order 1 + affine transf.
- d x' y' : order 2 + bilinear transf.
- e x' x' + f y' y' : order 3 + quadratic transf.
y = y' + g
- h y' + i x'
- j y' x'
- k y' y' + l x' x' `
where:
x', y' = coordinates of srcim x, y = coordinates of dstim a .. l = coefficients
The coefficients are in the input matrix, ordered as:
`a g
b h c i
d j
e k f l `
The matrix height may be 1, 3, 4, 6
Optional arguments
interpolate: VipsInterpolate, use this interpolator (default bilinear)
This method is not directly available to language bindings.
Parameters
out
Type: VipsImage
Output image.
| The argument will be set by the function. |
|---|
| The caller of the method takes ownership of the returned data, and is responsible for freeing it. |
coeff
Type: VipsImage
Horizontal quadratic.
The data is owned by the caller of the method.
...
Type: ``
NULL-terminated list of optional named arguments.
Return value
Type: int
0 on success, -1 on error.