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# vImage_PerpsectiveTransform

A projective-transformation matrix.

```
struct vImage_PerpsectiveTransform
```

## Topics

### Creating a projective-transformation structure

[`init()`](/documentation/Accelerate/vImage_PerpsectiveTransform/init())

Creates a projective-transformation structure.

[`init(a:b:c:d:tx:ty:vx:vy:v:)`](/documentation/Accelerate/vImage_PerpsectiveTransform/init(a:b:c:d:tx:ty:vx:vy:v:))

Creates a projective-transformation structure from the specified single-precision values.

[`init(source:destination:)`](/documentation/Accelerate/vImage_PerpsectiveTransform/init(source:destination:))

Returns a projective-transformation structure that defines the mapping between a source quadrilateral and a destination quadrilateral.

### Inspecting a projective-transformation structure’s properties

[`a`](/documentation/Accelerate/vImage_PerpsectiveTransform/a)

The top-left cell in the 3 x 3 transformation matrix.

[`b`](/documentation/Accelerate/vImage_PerpsectiveTransform/b)

The top-middle cell in the 3 x 3 transformation matrix.

[`c`](/documentation/Accelerate/vImage_PerpsectiveTransform/c)

The middle-left cell in the 3 x 3 transformation matrix.

[`d`](/documentation/Accelerate/vImage_PerpsectiveTransform/d)

The middle-middle cell in the 3 x 3 transformation matrix.

[`tx`](/documentation/Accelerate/vImage_PerpsectiveTransform/tx)

The x-coordinate translation.

[`ty`](/documentation/Accelerate/vImage_PerpsectiveTransform/ty)

The y-coordinate translation.

[`vx`](/documentation/Accelerate/vImage_PerpsectiveTransform/vx)

The x-component of the projective vector.

[`vy`](/documentation/Accelerate/vImage_PerpsectiveTransform/vy)

The y-component of the projective vector.

[`v`](/documentation/Accelerate/vImage_PerpsectiveTransform/v)

The homogeneous scale factor.


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