# Radial and Perspective Transformations

This topic describes the CogTransform2DPerspectiveAndRadial transformation, a 2-dimensional transformation that provides a mathematical representation of the perspective and radial distortion often present in images that are acquired using a camera.

It also discusses the CogTransform2DComposed transformation, a special transformation object that you use to construct a composed transformation. This transformation is used in cases where the result of composing two transformations cannot be represented using any of the VisionPro transformation objects (for example, the composition of two CogTransform2DPerspectiveAndRadial objects cannot be represented using another CogTransform2DPerspectiveAndRadial, nor as a CogTransform2DLinear object).