Usage

Using projective transformations is as simple as any other transformations. Simply compose them:

Rotate(-10:10) |> ScaleRatio(0.7:0.1:1.2) |> FlipX() |> Crop((128, 128))

The composition will automatically create a single projective transformation and evaluate only the cropped area.

Affine transformations

Affine transformations are a subgroup of projective transformations that can be composed very efficiently: composing two affine transformations results in another affine transformation. Affine transformations can represent translation, scaling, reflection and rotation. Available Transforms are:

• ScaleRatio, ScaleKeepAspect
• Rotate
• FlipX, FlipY, Reflect

Crops

To get a cropped result, simply compose any ProjectiveTransform with

• CenterCrop to crop a fixed-size region from the center; or
• RandomCrop to crop a fixed-size region from a random position