An image signal processor of a device, apparatus, or computing system that includes a camera capable of capturing image data may apply piecewise perspective transformations to image data received from the camera's image sensor. A scaling unit of an Image Signal Processor (ISP) may perform piecewise perspective transformations on a captured image to correct for rolling shutter artifacts and to provide video image stabilization. Image data may be divided into a series of horizontal slices and perspective transformations may be applied to each slice. The transformations may be based on motion data determined in any of various manners, such as by using gyroscopic data and/or optical-flow calculations. The piecewise perspective transforms may be encoded as Digital Difference Analyzer (DDA) steppers and may be implemented using separable scalar operations. The image signal processor may not write the received image data to system memory until after the transformations have been performed.